Mercurial > dovecot > original-hg > dovecot-1.2
annotate src/lib-index/mbox/mbox-rewrite.c @ 389:60040a9d243f HEAD
ioloop_create() takes now pool-parameter. io_buffer_create_mmaped() takes
start_offset parameter instead of getting it with lseek(). Instead of using
offsets to index file, we now use record indexes (first_hole_index, tree
file).
author | Timo Sirainen <tss@iki.fi> |
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date | Wed, 09 Oct 2002 02:26:08 +0300 |
parents | 652553a9f54c |
children | f25e575bf1ca |
rev | line source |
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1 /* Copyright (C) 2002 Timo Sirainen */ |
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2 |
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3 #include "lib.h" |
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4 #include "iobuffer.h" |
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5 #include "temp-string.h" |
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6 #include "write-full.h" |
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7 #include "mbox-index.h" |
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8 #include "mbox-lock.h" |
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9 #include "mail-index-util.h" |
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10 #include "mail-custom-flags.h" |
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11 |
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12 #include <stdio.h> |
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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 typedef struct { |
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18 IOBuffer *outbuf; |
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19 int failed; |
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20 |
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21 uoff_t content_length; |
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22 unsigned int seq; |
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23 unsigned int msg_flags; |
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24 const char **custom_flags; |
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25 |
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26 unsigned int uid_validity; |
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27 unsigned int uid_last; |
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28 |
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29 unsigned int ximapbase_found:1; |
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30 unsigned int xkeywords_found:1; |
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31 unsigned int status_found:1; |
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32 unsigned int xstatus_found:1; |
370
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33 unsigned int content_length_found:1; |
160
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34 } MboxRewriteContext; |
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35 |
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36 /* Remove dirty flag from all messages */ |
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37 static void reset_dirty_flags(MailIndex *index) |
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38 { |
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39 MailIndexRecord *rec; |
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40 |
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41 rec = index->lookup(index, 1); |
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42 while (rec != NULL) { |
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43 rec->index_flags &= ~INDEX_MAIL_FLAG_DIRTY; |
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44 rec = index->next(index, rec); |
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45 } |
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46 |
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47 index->header->flags &= ~(MAIL_INDEX_FLAG_DIRTY_MESSAGES | |
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48 MAIL_INDEX_FLAG_DIRTY_CUSTOMFLAGS); |
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49 } |
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50 |
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51 static int mbox_write(MailIndex *index, IOBuffer *inbuf, IOBuffer *outbuf, |
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52 uoff_t end_offset) |
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53 { |
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54 i_assert(inbuf->offset <= end_offset); |
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55 |
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56 if (io_buffer_send_iobuffer(outbuf, inbuf, |
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57 end_offset - inbuf->offset) < 0) |
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58 return FALSE; |
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59 |
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60 if (inbuf->offset < end_offset) { |
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61 /* fsck should have noticed it.. */ |
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62 index_set_error(index, "Error rewriting mbox file %s: " |
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63 "Unexpected end of file", index->mbox_path); |
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64 return FALSE; |
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65 } |
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66 |
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67 return TRUE; |
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68 } |
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69 |
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70 static int mbox_write_ximapbase(MboxRewriteContext *ctx) |
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71 { |
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72 const char *str; |
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73 int i; |
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74 |
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75 str = t_strdup_printf("X-IMAPbase: %u %u", |
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76 ctx->uid_validity, ctx->uid_last); |
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77 if (io_buffer_send(ctx->outbuf, str, strlen(str)) < 0) |
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78 return FALSE; |
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79 |
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80 for (i = 0; i < MAIL_CUSTOM_FLAGS_COUNT; i++) { |
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81 if (ctx->custom_flags[i] != NULL) { |
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82 if (io_buffer_send(ctx->outbuf, " ", 1) < 0) |
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83 return FALSE; |
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84 |
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85 if (io_buffer_send(ctx->outbuf, ctx->custom_flags[i], |
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86 strlen(ctx->custom_flags[i])) < 0) |
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87 return FALSE; |
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88 } |
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89 } |
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90 |
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91 if (io_buffer_send(ctx->outbuf, "\n", 1) < 0) |
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92 return FALSE; |
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93 |
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94 return TRUE; |
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95 } |
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96 |
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97 static int mbox_write_xkeywords(MboxRewriteContext *ctx, const char *x_keywords) |
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98 { |
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99 unsigned int field; |
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100 int i; |
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101 |
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102 if ((ctx->msg_flags & MAIL_CUSTOM_FLAGS_MASK) == 0 && |
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103 x_keywords == NULL) |
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104 return TRUE; |
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105 |
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106 if (io_buffer_send(ctx->outbuf, "X-Keywords:", 11) < 0) |
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107 return FALSE; |
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108 |
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109 field = 1 << MAIL_CUSTOM_FLAG_1_BIT; |
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110 for (i = 0; i < MAIL_CUSTOM_FLAGS_COUNT; i++, field <<= 1) { |
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111 if ((ctx->msg_flags & field) && ctx->custom_flags[i] != NULL) { |
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112 if (io_buffer_send(ctx->outbuf, " ", 1) < 0) |
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113 return FALSE; |
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114 |
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115 if (io_buffer_send(ctx->outbuf, ctx->custom_flags[i], |
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116 strlen(ctx->custom_flags[i])) < 0) |
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117 return FALSE; |
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118 } |
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119 } |
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120 |
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121 if (x_keywords != NULL) { |
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122 /* X-Keywords that aren't custom flags */ |
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123 if (io_buffer_send(ctx->outbuf, " ", 1) < 0) |
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124 return FALSE; |
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125 |
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126 if (io_buffer_send(ctx->outbuf, x_keywords, |
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|
127 strlen(x_keywords)) < 0) |
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128 return FALSE; |
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129 } |
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130 |
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131 if (io_buffer_send(ctx->outbuf, "\n", 1) < 0) |
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132 return FALSE; |
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133 |
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134 return TRUE; |
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135 } |
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136 |
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137 static int mbox_write_status(MboxRewriteContext *ctx, const char *status) |
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138 { |
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139 const char *str; |
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140 |
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141 str = (ctx->msg_flags & MAIL_SEEN) ? "Status: RO" : "Status: O"; |
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142 if (status != NULL) |
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143 str = t_strconcat(str, status, NULL); |
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144 |
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145 if (io_buffer_send(ctx->outbuf, str, strlen(str)) < 0) |
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146 return FALSE; |
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147 if (io_buffer_send(ctx->outbuf, "\n", 1) < 0) |
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148 return FALSE; |
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149 |
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150 return TRUE; |
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151 } |
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152 |
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153 static int mbox_write_xstatus(MboxRewriteContext *ctx, const char *x_status) |
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154 { |
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155 const char *str; |
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156 |
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157 /* X-Status field */ |
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158 if ((ctx->msg_flags & (MAIL_SYSTEM_FLAGS_MASK^MAIL_SEEN)) == 0 && |
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159 x_status == NULL) |
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160 return TRUE; |
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161 |
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162 str = t_strconcat("X-Status: ", |
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163 (ctx->msg_flags & MAIL_ANSWERED) ? "A" : "", |
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164 (ctx->msg_flags & MAIL_DRAFT) ? "D" : "", |
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165 (ctx->msg_flags & MAIL_FLAGGED) ? "F" : "", |
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166 (ctx->msg_flags & MAIL_DELETED) ? "T" : "", |
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167 x_status, NULL); |
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168 |
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169 if (io_buffer_send(ctx->outbuf, str, strlen(str)) < 0) |
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170 return FALSE; |
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171 if (io_buffer_send(ctx->outbuf, "\n", 1) < 0) |
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172 return FALSE; |
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|
173 |
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174 return TRUE; |
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|
175 } |
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176 |
370
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Write Content-Length header for rewritten messages.
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177 static int mbox_write_content_length(MboxRewriteContext *ctx) |
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178 { |
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179 char str[MAX_LARGEST_T_STRLEN+30]; |
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180 |
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181 i_snprintf(str, sizeof(str), "Content-Length: %"PRIuUOFF_T"\n", |
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182 ctx->content_length); |
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183 |
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184 if (io_buffer_send(ctx->outbuf, str, strlen(str)) < 0) |
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185 return FALSE; |
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186 return TRUE; |
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187 } |
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188 |
184 | 189 static const char *strip_chars(const char *value, size_t value_len, |
160
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|
190 const char *list) |
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191 { |
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192 /* leave only unknown flags, very likely none */ |
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193 char *ret, *p; |
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194 unsigned int i; |
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195 |
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196 ret = p = t_buffer_get(value_len+1); |
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197 for (i = 0; i < value_len; i++) { |
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198 if (strchr(list, value[i]) == NULL) |
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199 *p++ = value[i]; |
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200 } |
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201 |
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202 if (ret == p) |
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203 return NULL; |
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204 *p = '\0'; |
184 | 205 t_buffer_alloc((size_t) (p-ret)+1); |
160
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206 return ret; |
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207 } |
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208 |
184 | 209 static void update_stripped_custom_flags(const char *value, size_t len, |
160
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210 int index, void *context) |
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211 { |
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|
212 TempString *str = context; |
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213 |
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214 if (index < 0) { |
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215 /* not found, keep it */ |
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216 if (str->len != 0) |
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217 t_string_append_c(str, ' '); |
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218 t_string_append_n(str, value, len); |
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219 } |
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220 } |
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221 |
184 | 222 static const char *strip_custom_flags(const char *value, size_t len, |
160
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|
223 MboxRewriteContext *ctx) |
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|
224 { |
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|
225 TempString *str; |
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226 |
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227 str = t_string_new(len+1); |
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228 mbox_keywords_parse(value, len, ctx->custom_flags, |
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229 update_stripped_custom_flags, str); |
362
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230 return str->len == 0 ? NULL : str->str; |
160
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|
231 } |
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232 |
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233 static void header_func(MessagePart *part __attr_unused__, |
184 | 234 const char *name, size_t name_len, |
235 const char *value, size_t value_len, | |
160
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|
236 void *context) |
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|
237 { |
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|
238 MboxRewriteContext *ctx = context; |
362
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239 const char *str; |
160
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|
240 char *end; |
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|
241 |
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|
242 if (ctx->failed) |
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|
243 return; |
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|
244 |
362
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245 if (name_len == 6 && strncasecmp(name, "Status", 6) == 0) { |
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246 ctx->status_found = TRUE; |
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247 str = strip_chars(value, value_len, "RO"); |
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248 (void)mbox_write_status(ctx, str); |
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249 } else if (name_len == 8 && strncasecmp(name, "X-Status", 8) == 0) { |
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250 ctx->xstatus_found = TRUE; |
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251 str = strip_chars(value, value_len, "ADFT"); |
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252 (void)mbox_write_xstatus(ctx, str); |
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253 } else if (name_len == 10 && strncasecmp(name, "X-Keywords", 10) == 0) { |
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254 ctx->ximapbase_found = TRUE; |
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255 str = strip_custom_flags(value, value_len, ctx); |
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256 (void)mbox_write_xkeywords(ctx, str); |
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257 } else if (name_len == 10 && strncasecmp(name, "X-IMAPbase", 10) == 0) { |
160
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258 if (ctx->seq == 1) { |
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259 /* temporarily copy the value to make sure we |
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260 don't overflow it */ |
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261 t_push(); |
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262 value = t_strndup(value, value_len); |
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263 ctx->uid_validity = strtoul(value, &end, 10); |
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264 while (*end == ' ') end++; |
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265 ctx->uid_last = strtoul(end, &end, 10); |
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266 t_pop(); |
362
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267 |
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268 ctx->ximapbase_found = TRUE; |
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269 (void)mbox_write_ximapbase(ctx); |
160
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270 } |
370
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271 } else if (name_len == 14 && |
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272 strncasecmp(name, "Content-Length", 14) == 0) { |
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273 ctx->content_length_found = TRUE; |
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274 (void)mbox_write_content_length(ctx); |
369
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275 } else if (name_len > 0) { |
160
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276 /* save this header */ |
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277 (void)io_buffer_send(ctx->outbuf, name, name_len); |
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278 (void)io_buffer_send(ctx->outbuf, ": ", 2); |
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279 (void)io_buffer_send(ctx->outbuf, value, value_len); |
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280 (void)io_buffer_send(ctx->outbuf, "\n", 1); |
362
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281 } |
160
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282 |
362
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283 if (ctx->outbuf->closed) |
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284 ctx->failed = TRUE; |
160
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285 } |
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286 |
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287 static int mbox_write_header(MailIndex *index, |
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288 MailIndexRecord *rec, unsigned int seq, |
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289 IOBuffer *inbuf, IOBuffer *outbuf, |
180
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290 uoff_t end_offset) |
160
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291 { |
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292 /* We need to update fields that define message flags. Standard fields |
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293 are stored in Status and X-Status. For custom flags we use |
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294 uw-imapd compatible format, by first listing them in first message's |
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295 X-IMAPbase field and actually defining them in X-Keywords field. |
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296 |
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297 Format of X-IMAPbase is: <UID validity> <last used UID> <flag names> |
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298 |
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299 We don't want to sync our UIDs with the mbox file, so the UID |
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300 validity is always kept different from our internal UID validity. |
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301 Last used UID is also not updated, and set to 0 initially. |
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302 */ |
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303 MboxRewriteContext ctx; |
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304 MessageSize hdr_size; |
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305 |
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306 if (inbuf->offset >= end_offset) { |
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307 /* fsck should have noticed it.. */ |
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308 index_set_error(index, "Error rewriting mbox file %s: " |
221
ed0d5b17c7a4
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217
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309 "Unexpected end of file", index->mbox_path); |
160
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310 return FALSE; |
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311 } |
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312 |
180
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|
313 t_push(); |
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314 |
160
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315 /* parse the header, write the fields we don't want to change */ |
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316 memset(&ctx, 0, sizeof(ctx)); |
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317 ctx.outbuf = outbuf; |
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318 ctx.seq = seq; |
370
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319 ctx.content_length = rec->body_size; |
160
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320 ctx.msg_flags = rec->msg_flags; |
362
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321 ctx.uid_validity = index->header->uid_validity-1; |
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322 ctx.custom_flags = mail_custom_flags_list_get(index->custom_flags); |
160
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|
323 |
290
3dcc2275b4ca
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269
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324 io_buffer_set_read_limit(inbuf, inbuf->offset + rec->header_size); |
160
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|
325 message_parse_header(NULL, inbuf, &hdr_size, header_func, &ctx); |
290
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269
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|
326 io_buffer_set_read_limit(inbuf, 0); |
160
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|
327 |
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328 i_assert(hdr_size.physical_size == rec->header_size); |
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|
329 |
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330 /* append the flag fields */ |
362
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331 if (seq == 1 && !ctx.ximapbase_found) { |
160
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332 /* write X-IMAPbase header to first message */ |
362
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333 (void)mbox_write_ximapbase(&ctx); |
160
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|
334 } |
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335 |
362
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|
336 if (!ctx.xkeywords_found) |
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|
337 (void)mbox_write_xkeywords(&ctx, NULL); |
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338 if (!ctx.status_found) |
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339 (void)mbox_write_status(&ctx, NULL); |
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340 if (!ctx.xstatus_found) |
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|
341 (void)mbox_write_xstatus(&ctx, NULL); |
370
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|
342 if (!ctx.content_length_found) |
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|
343 (void)mbox_write_content_length(&ctx); |
160
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|
344 |
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|
345 t_pop(); |
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|
346 |
180
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160
diff
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|
347 mail_custom_flags_list_unref(index->custom_flags); |
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|
348 |
160
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349 /* empty line ends headers */ |
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|
350 (void)io_buffer_send(outbuf, "\n", 1); |
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|
351 |
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|
352 return TRUE; |
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|
353 } |
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|
354 |
312
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diff
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|
355 static int fd_copy(int in_fd, int out_fd, uoff_t out_offset) |
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|
356 { |
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diff
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|
357 IOBuffer *inbuf, *outbuf; |
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diff
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|
358 int ret; |
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diff
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|
359 |
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diff
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|
360 i_assert(out_offset <= OFF_T_MAX); |
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diff
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|
361 |
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303
diff
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|
362 if (lseek(out_fd, (off_t)out_offset, SEEK_SET) < 0) |
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diff
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|
363 return -1; |
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diff
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|
364 |
389
60040a9d243f
ioloop_create() takes now pool-parameter. io_buffer_create_mmaped() takes
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parents:
383
diff
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|
365 inbuf = io_buffer_create_mmap(in_fd, default_pool, 65536, 0, 0, FALSE); |
363
567e932cdc66
Added autoclose_fd-flag for io_buffer_create_file() and
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parents:
362
diff
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|
366 outbuf = io_buffer_create_file(out_fd, default_pool, 1024, FALSE); |
312
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|
367 |
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368 ret = io_buffer_send_iobuffer(outbuf, inbuf, inbuf->size); |
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369 if (ret < 0) |
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370 errno = outbuf->buf_errno; |
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371 else { |
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372 /* we may have shrinked the file */ |
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373 i_assert(out_offset + inbuf->size <= OFF_T_MAX); |
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374 ret = ftruncate(out_fd, (off_t) (out_offset + inbuf->size)); |
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375 } |
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376 |
364
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377 io_buffer_unref(outbuf); |
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378 io_buffer_unref(inbuf); |
312
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379 |
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380 return ret; |
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381 } |
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382 |
180
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383 int mbox_index_rewrite(MailIndex *index) |
160
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384 { |
312
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385 /* Write messages beginning from the first dirty one to temp file, |
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386 then copy it over the mbox file. This may create data loss if |
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387 interrupted (see below). This rewriting relies quite a lot on |
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388 valid header/body sizes which fsck() should have ensured. */ |
160
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389 MailIndexRecord *rec; |
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390 IOBuffer *inbuf, *outbuf; |
312
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391 uoff_t offset, dirty_offset; |
160
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392 const char *path; |
194 | 393 unsigned int seq; |
364
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394 int tmp_fd, failed, dirty_found, locked, rewrite; |
160
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395 |
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396 i_assert(index->lock_type == MAIL_LOCK_EXCLUSIVE); |
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397 |
303
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398 if ((index->header->flags & MAIL_INDEX_FLAG_DIRTY_MESSAGES) == 0) { |
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399 /* no need to rewrite */ |
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400 return TRUE; |
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401 } |
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402 |
364
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403 tmp_fd = -1; locked = FALSE; |
312
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404 failed = TRUE; rewrite = FALSE; |
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405 do { |
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406 /* lock before fscking to prevent race conditions between |
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407 fsck's unlock and our lock. */ |
364
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408 inbuf = mbox_file_open(index, 0, TRUE); |
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409 if (inbuf == NULL) |
312
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410 break; |
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411 |
365 | 412 if (!mbox_lock_write(index)) |
312
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413 break; |
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414 locked = TRUE; |
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415 |
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416 if (!mbox_index_fsck(index)) |
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417 break; |
301
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418 |
312
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419 if ((index->header->flags & |
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420 MAIL_INDEX_FLAG_DIRTY_MESSAGES) == 0) { |
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421 /* fsck() figured out there's no dirty messages |
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422 after all */ |
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423 failed = FALSE; rewrite = FALSE; |
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424 break; |
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425 } |
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426 |
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427 tmp_fd = mail_index_create_temp_file(index, &path); |
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428 if (tmp_fd == -1) |
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429 break; |
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430 |
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431 failed = FALSE; rewrite = TRUE; |
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432 } while (0); |
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433 |
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434 if (!rewrite) { |
365 | 435 if (locked) |
436 (void)mbox_unlock(index); | |
364
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437 if (inbuf != NULL) |
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438 io_buffer_unref(inbuf); |
312
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439 return !failed; |
160
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440 } |
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441 |
312
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442 if (index->header->flags & MAIL_INDEX_FLAG_DIRTY_CUSTOMFLAGS) { |
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443 /* need to update X-IMAPbase in first message */ |
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444 dirty_found = TRUE; |
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445 } else { |
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446 dirty_found = FALSE; |
160
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447 } |
312
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448 dirty_offset = 0; |
298
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449 |
363
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450 outbuf = io_buffer_create_file(tmp_fd, default_pool, 8192, FALSE); |
160
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451 |
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452 failed = FALSE; seq = 1; |
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453 rec = index->lookup(index, 1); |
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454 while (rec != NULL) { |
383 | 455 if (dirty_found || (rec->index_flags & INDEX_MAIL_FLAG_DIRTY)) { |
456 /* get offset to beginning of mail headers */ | |
457 if (!mbox_mail_get_start_offset(index, rec, &offset)) { | |
458 /* fsck should have fixed it */ | |
459 failed = TRUE; | |
460 break; | |
461 } | |
160
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462 |
383 | 463 if (offset + rec->header_size + rec->body_size > inbuf->size) { |
464 index_set_corrupted(index, | |
465 "Invalid message size"); | |
466 failed = TRUE; | |
467 break; | |
468 } | |
469 } else { | |
470 offset = 0; | |
160
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471 } |
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472 |
312
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473 if (!dirty_found && |
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474 (rec->index_flags & INDEX_MAIL_FLAG_DIRTY)) { |
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475 /* first dirty message */ |
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476 dirty_found = TRUE; |
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477 dirty_offset = offset; |
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478 |
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479 io_buffer_seek(inbuf, dirty_offset); |
160
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480 } |
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481 |
312
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482 if (dirty_found) { |
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483 /* write the From-line */ |
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484 if (!mbox_write(index, inbuf, outbuf, offset)) { |
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485 failed = TRUE; |
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486 break; |
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487 } |
160
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488 |
312
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489 /* write header, updating flag fields */ |
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490 offset += rec->header_size; |
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491 if (!mbox_write_header(index, rec, seq, inbuf, outbuf, |
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492 offset)) { |
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493 failed = TRUE; |
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494 break; |
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495 } |
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496 |
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497 /* write body */ |
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498 offset += rec->body_size; |
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499 if (!mbox_write(index, inbuf, outbuf, offset)) { |
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500 failed = TRUE; |
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501 break; |
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502 } |
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503 } |
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504 |
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505 seq++; |
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506 rec = index->next(index, rec); |
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507 } |
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508 |
312
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509 if (!dirty_found) { |
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510 index_set_error(index, "Expected dirty messages not found " |
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511 "from mbox file %s", index->mbox_path); |
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512 failed = TRUE; |
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513 } |
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514 |
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515 /* always end with a \n */ |
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516 (void)io_buffer_send(outbuf, "\n", 1); |
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517 if (outbuf->closed) { |
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518 errno = outbuf->buf_errno; |
221
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519 mbox_set_syscall_error(index, "write()"); |
160
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520 failed = TRUE; |
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521 } |
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522 |
364
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523 io_buffer_unref(inbuf); |
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524 io_buffer_unref(outbuf); |
312
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525 |
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526 if (!failed) { |
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527 /* POSSIBLE DATA LOSS HERE. We're writing to the mbox file, |
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528 so if we get killed here before finished, we'll lose some |
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529 bytes. I can't really think of any way to fix this, |
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530 rename() is problematic too especially because of file |
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531 locking issues (new mail could be lost). |
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532 |
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533 Usually we're moving the data by just a few bytes, so |
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534 the data loss should never be more than those few bytes.. |
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535 If we moved more, we could have written the file from end |
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536 to beginning in blocks (it'd be a bit slow to do it in |
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537 blocks of ~1-10 bytes which is the usual case, so we don't |
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538 bother). |
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539 |
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540 Also, we might as well be shrinking the file, in which |
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541 case we can't lose data. */ |
364
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542 if (fd_copy(tmp_fd, index->mbox_fd, dirty_offset) == 0) { |
269
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543 /* all ok, we need to fsck the index next time. |
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544 use set_flags because set_lock() would remove it |
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545 if we modified it directly */ |
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546 index->set_flags |= MAIL_INDEX_FLAG_FSCK; |
160
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547 reset_dirty_flags(index); |
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548 } else { |
312
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549 mbox_set_syscall_error(index, "fd_copy()"); |
160
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550 failed = TRUE; |
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551 } |
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552 } |
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553 |
365 | 554 (void)mbox_unlock(index); |
160
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555 (void)unlink(path); |
297
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556 |
312
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557 if (close(tmp_fd) < 0) |
297
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558 index_file_set_syscall_error(index, path, "close()"); |
160
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559 return failed; |
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560 } |