Mercurial > dovecot > core-2.2

annotate src/lib-index/mail-index-compress.c @ 29:e9375147c0cb HEAD

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Added write_full() which is a simple wrapper around write() meant for writing into files. When there's too much deleted data in index files, they're now compressed when the index is being opened.
author Timo Sirainen <tss@iki.fi>
date Mon, 26 Aug 2002 02:46:59 +0300
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children 5e9cf9565353
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29
e9375147c0cb Added write_full() which is a simple wrapper around write() meant for
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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 "write-full.h"
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5 #include "mail-index.h"
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6 #include "mail-index-data.h"
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7 #include "mail-index-util.h"
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8
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9 #include <stdio.h>
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10 #include <unistd.h>
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11
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12 int mail_index_compress(MailIndex *index)
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13 {
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14 MailIndexHeader *hdr;
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15 MailIndexRecord *rec, *hole_rec, *end_rec;
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16 off_t fsize;
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17
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18 if (!index->set_lock(index, MAIL_LOCK_EXCLUSIVE))
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19 return FALSE;
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20
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21 hdr = index->get_header(index);
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22
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23 if (hdr->first_hole_position == 0) {
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24 /* we don't need to compress after all. shouldn't happen.. */
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25 index->header->flags &= ~MAIL_INDEX_FLAG_CACHE_FIELDS;
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26 return TRUE;
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27 }
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28
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29 /* if we get interrupted, the whole index is probably corrupted.
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30 so keep rebuild-flag on while doing this */
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31 hdr->flags |= MAIL_INDEX_FLAG_REBUILD;
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32 if (!mail_index_fmsync(index, sizeof(MailIndexHeader)))
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33 return FALSE;
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34
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35 /* first actually compress the data */
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36 end_rec = (MailIndexRecord *) ((char *) index->mmap_base +
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37 index->mmap_length);
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38 hole_rec = (MailIndexRecord *) ((char *) index->mmap_base +
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39 hdr->first_hole_position);
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40 rec = hole_rec + hdr->first_hole_records;
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41 while (rec < end_rec) {
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42 if (rec->uid != 0) {
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43 memcpy(hole_rec, rec, sizeof(MailIndexRecord));
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44 hole_rec++;
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45 }
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46 rec++;
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47 }
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48
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49 /* truncate the file to get rid of the extra records */
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50 fsize = (char *) hole_rec - (char *) index->mmap_base;
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51 if (ftruncate(index->fd, fsize) == -1) {
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52 index_set_error(index, "ftruncate() failed for %s: %m",
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53 index->filepath);
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54 return FALSE;
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55 }
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56
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57 /* update headers */
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58 index->header->first_hole_position = 0;
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59 index->header->first_hole_records = 0;
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60
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61 /* make sure the whole file is synced before removing rebuild-flag */
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62 if (!mail_index_fmsync(index, fsize))
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63 return FALSE;
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64
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65 index->header->flags &= ~(MAIL_INDEX_FLAG_CACHE_FIELDS |
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66 MAIL_INDEX_FLAG_REBUILD);
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67 return TRUE;
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68 }
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69
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70 int mail_index_compress_data(MailIndex *index)
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71 {
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72 MailIndexRecord *rec;
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73 MailIndexDataHeader data_hdr;
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74 unsigned char *mmap_data;
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75 size_t mmap_data_size;
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76 off_t offset;
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77 const char *temppath, *datapath;
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78 int fd;
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79
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80 /* write the data into temporary file updating the offsets in index
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81 while doing it. if we fail (especially if out of disk space/quota)
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82 we'll simply fail and index is rebuilt later */
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83 if (!index->set_lock(index, MAIL_LOCK_EXCLUSIVE))
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84 return FALSE;
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85
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86 mmap_data = mail_index_data_get_mmaped(index->data, &mmap_data_size);
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87 if (mmap_data == NULL)
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88 return FALSE;
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89
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90 fd = mail_index_create_temp_file(index, &temppath);
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91 if (fd == -1)
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92 return FALSE;
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93
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94 /* write data header */
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95 memset(&data_hdr, 0, sizeof(data_hdr));
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96 data_hdr.indexid = index->indexid;
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97 if (write_full(fd, &data_hdr, sizeof(data_hdr)) < 0) {
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98 index_set_error(index, "Error writing to temp index data "
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99 "%s: %m", temppath);
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100 (void)close(fd);
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101 (void)unlink(temppath);
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102 return FALSE;
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103 }
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104
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105 /* no we'll begin the actual moving. keep rebuild-flag on
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106 while doing it. */
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107 index->header->flags |= MAIL_INDEX_FLAG_REBUILD;
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108 if (!mail_index_fmsync(index, sizeof(MailIndexHeader))) {
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109 (void)close(fd);
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110 (void)unlink(temppath);
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111 return FALSE;
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112 }
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113
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114 offset = sizeof(data_hdr);
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115 rec = index->lookup(index, 1);
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116 while (rec != NULL) {
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117 if (write_full(fd, mmap_data + rec->data_position,
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118 rec->data_size) < 0) {
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119 index_set_error(index, "Error writing to temp index "
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120 "data %s: %m", temppath);
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121 (void)close(fd);
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122 (void)unlink(temppath);
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123 return FALSE;
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124 }
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125
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126 rec->data_position = offset;
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127 offset += rec->data_size;
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128
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129 rec = index->next(index, rec);
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130 }
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131
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132 /* now, close the old data file and rename the temp file into
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133 new data file */
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134 mail_index_data_free(index->data);
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135 (void)close(fd);
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136
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137 datapath = t_strconcat(index->filepath, DATA_FILE_PREFIX, NULL);
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138 if (rename(temppath, datapath) < 0) {
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139 index_set_error(index, "rename(%s, %s) failed: %m",
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140 temppath, datapath);
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141 return FALSE;
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142 }
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143
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144 /* make sure the whole file is synced before removing rebuild-flag */
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145 if (!mail_index_fmsync(index, index->mmap_length))
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146 return FALSE;
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147
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148 index->header->flags &= ~(MAIL_INDEX_FLAG_CACHE_FIELDS |
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149 MAIL_INDEX_FLAG_REBUILD);
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150
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151 return mail_index_data_open(index);
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152 }