Mercurial > dovecot > original-hg > dovecot-1.2

annotate src/lib-storage/mailbox-uidvalidity.c @ 9354:687ac828b964 HEAD

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lib-index: modseqs weren't tracked properly within session when changes were done.
author Timo Sirainen <tss@iki.fi>
date Tue, 01 Sep 2009 13:05:03 -0400
parents b9faf4db2a9f
children 00cd9aacd03c
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rev   line source
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b9faf4db2a9f Updated copyright notices to include year 2009.
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1 /* Copyright (c) 2008-2009 Dovecot authors, see the included COPYING file */
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2
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3 #include "lib.h"
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4 #include "ioloop.h"
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5 #include "str.h"
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6 #include "read-full.h"
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7 #include "write-full.h"
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8 #include "mailbox-uidvalidity.h"
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9
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10 #include <stdio.h>
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11 #include <stdlib.h>
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12 #include <unistd.h>
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13 #include <dirent.h>
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14 #include <fcntl.h>
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15
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16 #define RETRY_COUNT 10
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17
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18 static uint32_t mailbox_uidvalidity_next_fallback(void)
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19 {
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20 static uint32_t uid_validity = 0;
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21
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22 /* we failed to use the uidvalidity file. don't fail the mailbox
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23 creation because of it though, most of the time it's safe enough
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24 to use the current time as the uidvalidity value. */
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25 if (uid_validity < (uint32_t)ioloop_time)
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26 uid_validity = (uint32_t)ioloop_time;
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27 else
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28 uid_validity++;
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29 return uid_validity;
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30 }
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31
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32 static void mailbox_uidvalidity_write(const char *path, uint32_t uid_validity)
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33 {
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34 char buf[8+1];
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35 int fd;
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36
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37 fd = open(path, O_RDWR | O_CREAT, 0666);
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38 if (fd == -1) {
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39 i_error("open(%s) failed: %m", path);
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40 return;
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41 }
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42 i_snprintf(buf, sizeof(buf), "%08x", uid_validity);
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43 if (pwrite_full(fd, buf, strlen(buf), 0) < 0)
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44 i_error("write(%s) failed: %m", path);
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45 if (close(fd) < 0)
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46 i_error("close(%s) failed: %m", path);
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47 }
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48
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49 static int mailbox_uidvalidity_rename(const char *path, uint32_t *uid_validity)
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50 {
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51 string_t *src, *dest;
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52 unsigned int i, prefix_len;
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53 int ret;
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54
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55 src = t_str_new(256);
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56 str_append(src, path);
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57 dest = t_str_new(256);
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58 str_append(dest, path);
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59 prefix_len = str_len(src);
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60
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61 for (i = 0; i < RETRY_COUNT; i++) {
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62 str_printfa(src, ".%08x", *uid_validity);
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63 *uid_validity += 1;
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64 str_printfa(dest, ".%08x", *uid_validity);
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65
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66 if ((ret = rename(str_c(src), str_c(dest))) == 0 ||
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67 errno != ENOENT)
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68 break;
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69
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70 /* possibly a race condition. try the next value. */
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71 str_truncate(src, prefix_len);
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72 str_truncate(dest, prefix_len);
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73 }
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74 if (ret < 0)
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75 i_error("rename(%s, %s) failed: %m", str_c(src), str_c(dest));
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76 return ret;
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77 }
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78
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79 static uint32_t mailbox_uidvalidity_next_rescan(const char *path)
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80 {
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81 DIR *d;
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82 struct dirent *dp;
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83 const char *fname, *dir, *prefix, *tmp;
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84 char *endp;
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85 unsigned int i, prefix_len;
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86 uint32_t cur_value, min_value, max_value;
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87 int fd;
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88
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89 fname = strrchr(path, '/');
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90 if (fname == NULL) {
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91 dir = ".";
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92 fname = path;
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93 } else {
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94 dir = t_strdup_until(path, fname);
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95 fname++;
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96 }
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97
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98 d = opendir(dir);
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99 if (d == NULL) {
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100 i_error("opendir(%s) failed: %m", dir);
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101 return mailbox_uidvalidity_next_fallback();
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102 }
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103 prefix = t_strconcat(fname, ".", NULL);
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104 prefix_len = strlen(prefix);
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105
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106 /* just in case there happens to be multiple matching uidvalidity
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107 files, track the min/max values. use the max value and delete the
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108 min value file. */
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109 max_value = 0; min_value = (uint32_t)-1;
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110 while ((dp = readdir(d)) != NULL) {
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111 if (strncmp(dp->d_name, prefix, prefix_len) == 0) {
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112 cur_value = strtoul(dp->d_name + prefix_len, &endp, 16);
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113 if (*endp == '\0') {
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114 if (min_value > cur_value)
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115 min_value = cur_value;
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116 if (max_value < cur_value)
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117 max_value = cur_value;
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118 }
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119 }
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120 }
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121 if (closedir(d) < 0)
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122 i_error("closedir(%s) failed: %m", dir);
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123
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124 if (max_value == 0) {
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125 /* no uidvalidity files. create one. */
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126 for (i = 0; i < RETRY_COUNT; i++) {
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127 cur_value = mailbox_uidvalidity_next_fallback();
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128 tmp = t_strdup_printf("%s.%08x", path, cur_value);
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129 fd = open(tmp, O_RDWR | O_CREAT | O_EXCL, 0666);
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130 if (fd != -1 || errno != EEXIST)
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131 break;
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132 /* already exists. although it's quite unlikely we'll
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133 hit this race condition. more likely we'll create
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134 a duplicate file.. */
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135 }
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136 if (fd == -1) {
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137 i_error("creat(%s) failed: %m", tmp);
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138 return cur_value;
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139 }
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140 (void)close(fd);
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141 mailbox_uidvalidity_write(path, cur_value);
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142 return cur_value;
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143 }
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144 if (min_value != max_value) {
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145 /* duplicate uidvalidity files, delete the oldest */
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146 tmp = t_strdup_printf("%s.%08x", path, min_value);
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147 if (unlink(tmp) < 0 && errno != ENOENT)
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148 i_error("unlink(%s) failed: %m", tmp);
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149 }
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150
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151 cur_value = max_value;
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152 if (mailbox_uidvalidity_rename(path, &cur_value) < 0)
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153 return mailbox_uidvalidity_next_fallback();
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154 mailbox_uidvalidity_write(path, cur_value);
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155 return cur_value;
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156 }
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157
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158 uint32_t mailbox_uidvalidity_next(const char *path)
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159 {
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160 char buf[8+1], *endp;
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161 uint32_t cur_value;
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162 int fd, ret;
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163
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164 fd = open(path, O_RDWR);
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165 if (fd == -1) {
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166 if (errno != ENOENT)
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167 i_error("open(%s) failed: %m", path);
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168 return mailbox_uidvalidity_next_rescan(path);
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169 }
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170 ret = read_full(fd, buf, sizeof(buf)-1);
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171 if (ret < 0) {
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172 i_error("read(%s) failed: %m", path);
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173 (void)close(fd);
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174 return mailbox_uidvalidity_next_rescan(path);
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175 }
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176 buf[sizeof(buf)-1] = 0;
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177 cur_value = strtoul(buf, &endp, 16);
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178 if (ret == 0 || endp != buf+sizeof(buf)-1) {
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179 /* broken value */
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180 (void)close(fd);
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181 return mailbox_uidvalidity_next_rescan(path);
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182 }
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183
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184 /* we now have the current uidvalidity value that's hopefully correct */
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185 if (mailbox_uidvalidity_rename(path, &cur_value) < 0)
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186 return mailbox_uidvalidity_next_rescan(path);
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187
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188 /* fast path succeeded. write the current value to the main
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189 uidvalidity file. */
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190 i_snprintf(buf, sizeof(buf), "%08x", cur_value);
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191 if (pwrite_full(fd, buf, strlen(buf), 0) < 0)
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192 i_error("write(%s) failed: %m", path);
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193 if (close(fd) < 0)
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194 i_error("close(%s) failed: %m", path);
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195 return cur_value;
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196 }