1 | /*===============================================================*\ |
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2 | | Project: RTEMS msdos format functionality | |
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3 | +-----------------------------------------------------------------+ |
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4 | | File: msdos_format.c | |
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5 | +-----------------------------------------------------------------+ |
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6 | | Copyright (c) 2004 IMD | |
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7 | | Ingenieurbuero fuer Microcomputertechnik Th. Doerfler | |
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8 | | <Thomas.Doerfler@imd-systems.de> | |
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9 | | all rights reserved | |
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10 | +-----------------------------------------------------------------+ |
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11 | | this file contains msdos_format function. This function | |
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12 | | formats a disk partition conforming to MS-DOS conventions | |
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13 | | | |
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14 | | The license and distribution terms for this file may be | |
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15 | | found in the file LICENSE in this distribution or at | |
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16 | | http://www.rtems.com/license/LICENSE. | |
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17 | | | |
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18 | +-----------------------------------------------------------------+ |
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19 | | date history ID | |
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20 | | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
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21 | | 29.10.04 creation doe | |
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22 | \*===============================================================*/ |
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23 | |
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24 | #if HAVE_CONFIG_H |
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25 | #include "config.h" |
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26 | #endif |
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27 | |
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28 | #include <sys/types.h> |
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29 | #include <sys/stat.h> |
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30 | #include <fcntl.h> |
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31 | #include <unistd.h> |
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32 | #include <errno.h> |
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33 | #include <stdlib.h> |
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34 | #include <stdio.h> |
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35 | #include <ctype.h> |
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36 | #include <assert.h> |
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37 | |
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38 | #include <rtems/libio_.h> |
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39 | |
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40 | #include "fat.h" |
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41 | #include "fat_fat_operations.h" |
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42 | #include "msdos.h" |
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43 | #include "dosfs.h" |
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44 | |
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45 | typedef struct { |
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46 | uint32_t bytes_per_sector; |
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47 | uint32_t totl_sector_cnt; |
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48 | uint32_t rsvd_sector_cnt; |
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49 | |
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50 | uint32_t sectors_per_cluster; |
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51 | uint32_t sectors_per_fat; |
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52 | |
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53 | uint32_t fat_start_sec; |
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54 | uint32_t files_per_root_dir; |
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55 | uint32_t root_dir_sectors; |
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56 | uint32_t root_dir_start_sec; |
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57 | uint32_t root_dir_fmt_sec_cnt; |
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58 | uint32_t mbr_copy_sec; /* location of copy of mbr or 0 */ |
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59 | uint32_t fsinfo_sec; /* location of fsinfo sector or 0 */ |
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60 | uint8_t fat_num; |
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61 | uint8_t media_code; |
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62 | uint8_t fattype; |
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63 | char OEMName[FAT_BR_OEMNAME_SIZE+1]; |
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64 | char VolLabel[FAT_BR_VOLLAB_SIZE+1]; |
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65 | bool VolLabel_present; |
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66 | uint32_t vol_id; |
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67 | } msdos_format_param_t; |
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68 | |
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69 | /* |
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70 | * Formatted output. |
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71 | */ |
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72 | static void |
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73 | msdos_format_printf (const msdos_format_request_param_t *rqdata, |
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74 | int info_level, |
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75 | const char *format, ...) |
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76 | { |
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77 | va_list args; |
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78 | va_start (args, format); |
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79 | if (rqdata != NULL && rqdata->info_level >= info_level) |
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80 | { |
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81 | vfprintf (stdout, format, args); |
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82 | fflush (stdout); |
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83 | } |
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84 | } |
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85 | |
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86 | /*=========================================================================*\ |
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87 | | Function: | |
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88 | \*-------------------------------------------------------------------------*/ |
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89 | static int msdos_format_read_sec |
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90 | ( |
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91 | /*-------------------------------------------------------------------------*\ |
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92 | | Purpose: | |
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93 | | function to read a sector | |
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94 | +---------------------------------------------------------------------------+ |
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95 | | Input Parameters: | |
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96 | \*-------------------------------------------------------------------------*/ |
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97 | int fd, /* file descriptor index */ |
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98 | uint32_t start_sector, /* sector number to write to */ |
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99 | uint32_t sector_size, /* size of sector */ |
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100 | char *buffer /* buffer with read data into */ |
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101 | ) |
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102 | /*-------------------------------------------------------------------------*\ |
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103 | | Return Value: | |
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104 | | 0, if success, -1 and errno if failed | |
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105 | \*=========================================================================*/ |
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106 | { |
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107 | int ret_val = 0; |
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108 | |
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109 | if (0 > lseek(fd,((off_t)start_sector)*sector_size,SEEK_SET)) { |
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110 | ret_val = -1; |
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111 | } |
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112 | if (ret_val == 0) { |
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113 | if (0 > read(fd,buffer,sector_size)) { |
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114 | ret_val = -1; |
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115 | } |
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116 | } |
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117 | |
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118 | return ret_val; |
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119 | } |
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120 | |
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121 | /*=========================================================================*\ |
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122 | | Function: | |
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123 | \*-------------------------------------------------------------------------*/ |
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124 | static int msdos_format_write_sec |
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125 | ( |
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126 | /*-------------------------------------------------------------------------*\ |
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127 | | Purpose: | |
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128 | | function to write to a sector | |
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129 | +---------------------------------------------------------------------------+ |
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130 | | Input Parameters: | |
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131 | \*-------------------------------------------------------------------------*/ |
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132 | int fd, /* file descriptor index */ |
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133 | uint32_t start_sector, /* sector number to write to */ |
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134 | uint32_t sector_size, /* size of sector */ |
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135 | const char *buffer /* buffer with write data */ |
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136 | ) |
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137 | /*-------------------------------------------------------------------------*\ |
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138 | | Return Value: | |
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139 | | 0, if success, -1 and errno if failed | |
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140 | \*=========================================================================*/ |
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141 | { |
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142 | int ret_val = 0; |
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143 | |
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144 | if (0 > lseek(fd,((off_t)start_sector)*sector_size,SEEK_SET)) { |
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145 | ret_val = -1; |
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146 | } |
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147 | if (ret_val == 0) { |
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148 | if (0 > write(fd,buffer,sector_size)) { |
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149 | ret_val = -1; |
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150 | } |
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151 | } |
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152 | |
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153 | return ret_val; |
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154 | } |
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155 | |
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156 | /*=========================================================================* \ |
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157 | | Function: | |
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158 | \*-------------------------------------------------------------------------*/ |
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159 | static int msdos_format_fill_sectors |
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160 | ( |
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161 | /*-------------------------------------------------------------------------*\ |
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162 | | Purpose: | |
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163 | | function to fill sectors with byte | |
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164 | +---------------------------------------------------------------------------+ |
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165 | | Input Parameters: | |
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166 | \*-------------------------------------------------------------------------*/ |
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167 | const msdos_format_request_param_t *rqdata, |
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168 | int fd, /* file descriptor index */ |
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169 | uint32_t start_sector, /* sector number to fill to */ |
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170 | uint32_t sector_cnt, /* number of sectors to fill to */ |
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171 | uint32_t sector_size, /* size of sector */ |
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172 | const char fill_byte /* byte to fill into sectors */ |
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173 | ) |
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174 | /*-------------------------------------------------------------------------*\ |
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175 | | Return Value: | |
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176 | | 0, if success, -1 and errno if failed | |
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177 | \*=========================================================================*/ |
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178 | { |
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179 | int ret_val = 0; |
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180 | char *fill_buffer = NULL; |
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181 | uint32_t total_sectors = sector_cnt; |
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182 | int last_percent = -1; |
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183 | |
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184 | /* |
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185 | * allocate and fill buffer |
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186 | */ |
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187 | if (ret_val == 0) { |
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188 | fill_buffer = malloc(sector_size); |
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189 | if (fill_buffer == NULL) { |
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190 | errno = ENOMEM; |
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191 | ret_val = -1; |
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192 | } |
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193 | else { |
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194 | memset(fill_buffer,fill_byte,sector_size); |
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195 | } |
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196 | } |
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197 | |
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198 | msdos_format_printf (rqdata, MSDOS_FMT_INFO_LEVEL_DETAIL, |
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199 | "Filling : "); |
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200 | /* |
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201 | * write to consecutive sectors |
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202 | */ |
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203 | while ((ret_val == 0) && |
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204 | (sector_cnt > 0)) { |
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205 | int percent = (sector_cnt * 100) / total_sectors; |
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206 | if (percent != last_percent) { |
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207 | if ((percent & 1) == 0) |
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208 | msdos_format_printf (rqdata, MSDOS_FMT_INFO_LEVEL_DETAIL, "."); |
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209 | last_percent = percent; |
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210 | } |
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211 | ret_val = msdos_format_write_sec(fd,start_sector,sector_size,fill_buffer); |
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212 | start_sector++; |
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213 | sector_cnt--; |
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214 | } |
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215 | |
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216 | msdos_format_printf (rqdata, MSDOS_FMT_INFO_LEVEL_DETAIL, "\n"); |
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217 | |
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218 | if (ret_val) |
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219 | msdos_format_printf (rqdata, MSDOS_FMT_INFO_LEVEL_INFO, |
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220 | "filling error on sector: %d\n", start_sector); |
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221 | |
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222 | /* |
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223 | * cleanup |
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224 | */ |
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225 | if (fill_buffer != NULL) { |
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226 | free(fill_buffer); |
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227 | fill_buffer = NULL; |
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228 | } |
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229 | return ret_val; |
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230 | } |
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231 | |
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232 | |
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233 | /*=========================================================================*\ |
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234 | | Function: | |
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235 | \*-------------------------------------------------------------------------*/ |
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236 | static int msdos_format_gen_volid |
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237 | ( |
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238 | /*-------------------------------------------------------------------------*\ |
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239 | | Purpose: | |
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240 | | function to generate a pseudo-random volume id | |
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241 | +---------------------------------------------------------------------------+ |
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242 | | Input Parameters: | |
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243 | \*-------------------------------------------------------------------------*/ |
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244 | uint32_t *volid_ptr /* volume ID return pointer */ |
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245 | ) |
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246 | /*-------------------------------------------------------------------------*\ |
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247 | | Return Value: | |
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248 | | 0, if success, -1 and errno if failed | |
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249 | \*=========================================================================*/ |
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250 | { |
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251 | int ret_val = 0; |
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252 | int rc; |
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253 | rtems_clock_time_value time_value; |
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254 | |
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255 | rc = rtems_clock_get(RTEMS_CLOCK_GET_TIME_VALUE,&time_value); |
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256 | if (rc == RTEMS_SUCCESSFUL) { |
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257 | *volid_ptr = time_value.seconds + time_value.microseconds; |
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258 | } |
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259 | else { |
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260 | *volid_ptr = rand(); |
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261 | } |
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262 | |
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263 | return ret_val; |
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264 | } |
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265 | |
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266 | |
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267 | /*=========================================================================*\ |
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268 | | Function: | |
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269 | \*-------------------------------------------------------------------------*/ |
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270 | static int msdos_format_eval_sectors_per_cluster |
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271 | ( |
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272 | /*-------------------------------------------------------------------------*\ |
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273 | | Purpose: | |
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274 | | function to check/adjust sectors_per_cluster to legal values | |
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275 | +---------------------------------------------------------------------------+ |
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276 | | Input Parameters: | |
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277 | \*-------------------------------------------------------------------------*/ |
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278 | int fattype, /* type code of FAT (FAT_FAT12 ...) */ |
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279 | uint32_t bytes_per_sector, /* byte count per sector (512) */ |
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280 | uint32_t fatdata_sec_cnt, /* sectors available for FAT and data */ |
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281 | uint8_t fat_num, /* number of fat copies */ |
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282 | uint32_t sectors_per_cluster, /* sectors per cluster (requested) */ |
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283 | uint32_t *sectors_per_cluster_adj, /* ret: sec per cluster (granted) */ |
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284 | uint32_t *sectors_per_fat_ptr /* ret: sectors needed for one FAT */ |
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285 | ) |
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286 | /*-------------------------------------------------------------------------*\ |
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287 | | Return Value: | |
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288 | | 0, if success, -1 and errno if failed | |
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289 | \*=========================================================================*/ |
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290 | { |
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291 | |
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292 | bool finished = false; |
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293 | int ret_val = 0; |
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294 | uint32_t fatdata_cluster_cnt; |
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295 | uint32_t fat_capacity; |
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296 | uint32_t sectors_per_fat; |
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297 | uint32_t data_cluster_cnt; |
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298 | /* |
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299 | * ensure, that maximum cluster size (32KByte) is not exceeded |
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300 | */ |
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301 | while (MS_BYTES_PER_CLUSTER_LIMIT / bytes_per_sector < sectors_per_cluster) { |
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302 | sectors_per_cluster /= 2; |
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303 | } |
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304 | |
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305 | do { |
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306 | /* |
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307 | * compute number of data clusters for current data: |
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308 | * - compute cluster count for data AND fat |
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309 | * - compute storage size for FAT |
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310 | * - subtract from total cluster count |
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311 | */ |
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312 | fatdata_cluster_cnt = fatdata_sec_cnt/sectors_per_cluster; |
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313 | if (fattype == FAT_FAT12) { |
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314 | fat_capacity = fatdata_cluster_cnt * 3 / 2; |
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315 | } |
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316 | else if (fattype == FAT_FAT16) { |
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317 | fat_capacity = fatdata_cluster_cnt * 2; |
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318 | } |
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319 | else { /* FAT32 */ |
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320 | fat_capacity = fatdata_cluster_cnt * 4; |
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321 | } |
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322 | |
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323 | sectors_per_fat = ((fat_capacity |
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324 | + (bytes_per_sector - 1)) |
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325 | / bytes_per_sector); |
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326 | |
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327 | data_cluster_cnt = (fatdata_cluster_cnt - |
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328 | (((sectors_per_fat * fat_num) |
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329 | + (sectors_per_cluster - 1)) |
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330 | / sectors_per_cluster)); |
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331 | /* |
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332 | * data cluster count too big? then make sectors bigger |
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333 | */ |
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334 | if (((fattype == FAT_FAT12) && (data_cluster_cnt > FAT_FAT12_MAX_CLN)) || |
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335 | ((fattype == FAT_FAT16) && (data_cluster_cnt > FAT_FAT16_MAX_CLN))) { |
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336 | sectors_per_cluster *= 2; |
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337 | } |
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338 | else { |
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339 | finished = true; |
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340 | } |
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341 | /* |
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342 | * when maximum cluster size is exceeded, we have invalid data, abort... |
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343 | */ |
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344 | if ((sectors_per_cluster * bytes_per_sector) |
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345 | > MS_BYTES_PER_CLUSTER_LIMIT) { |
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346 | ret_val = EINVAL; |
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347 | finished = true; |
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348 | } |
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349 | } while (!finished); |
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350 | |
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351 | if (ret_val != 0) { |
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352 | rtems_set_errno_and_return_minus_one(ret_val); |
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353 | } |
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354 | else { |
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355 | *sectors_per_cluster_adj = sectors_per_cluster; |
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356 | *sectors_per_fat_ptr = sectors_per_fat; |
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357 | return 0; |
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358 | } |
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359 | } |
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360 | |
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361 | |
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362 | /*=========================================================================*\ |
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363 | | Function: | |
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364 | \*-------------------------------------------------------------------------*/ |
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365 | static int msdos_format_determine_fmt_params |
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366 | ( |
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367 | /*-------------------------------------------------------------------------*\ |
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368 | | Purpose: | |
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369 | | determine parameters for formatting | |
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370 | +---------------------------------------------------------------------------+ |
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371 | | Input Parameters: | |
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372 | \*-------------------------------------------------------------------------*/ |
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373 | const rtems_disk_device *dd, /* disk device structure */ |
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374 | const msdos_format_request_param_t *rqdata, /* requested fmt parameters */ |
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375 | msdos_format_param_t *fmt_params/* computed fmt parameters */ |
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376 | ) |
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377 | /*-------------------------------------------------------------------------*\ |
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378 | | Return Value: | |
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379 | | 0, if success, -1 and errno if failed | |
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380 | \*=========================================================================*/ |
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381 | { |
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382 | int ret_val = 0; |
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383 | uint32_t fatdata_sect_cnt; |
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384 | uint32_t onebit; |
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385 | uint32_t sectors_per_cluster_adj = 0; |
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386 | uint64_t total_size = 0; |
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387 | |
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388 | memset(fmt_params,0,sizeof(*fmt_params)); |
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389 | /* |
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390 | * this one is fixed in this implementation. |
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391 | * At least one thing we don't have to magically guess... |
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392 | */ |
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393 | if (ret_val == 0) { |
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394 | fmt_params->bytes_per_sector = dd->block_size; |
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395 | fmt_params->totl_sector_cnt = dd->size; |
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396 | total_size = dd->block_size * dd->size; |
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397 | msdos_format_printf (rqdata, MSDOS_FMT_INFO_LEVEL_DETAIL, |
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398 | "bytes per sector: %d\ntotal sectors: %d\ntotal size: %lu\n", |
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399 | dd->block_size, dd->size, total_size); |
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400 | } |
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401 | /* |
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402 | * determine number of FATs |
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403 | */ |
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404 | if (ret_val == 0) { |
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405 | if ((rqdata == NULL) || |
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406 | (rqdata->fat_num == 0)) { |
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407 | fmt_params->fat_num = 2; |
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408 | } |
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409 | else if (rqdata->fat_num <= 6) { |
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410 | fmt_params->fat_num = rqdata->fat_num; |
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411 | } |
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412 | else { |
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413 | ret_val = EINVAL; |
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414 | } |
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415 | } |
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416 | |
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417 | if (ret_val == 0) |
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418 | msdos_format_printf (rqdata, MSDOS_FMT_INFO_LEVEL_DETAIL, |
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419 | "number of fats: %d\n", fmt_params->fat_num); |
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420 | |
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421 | /* |
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422 | * Now we get sort of a loop when determining things: |
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423 | * The FAT type (FAT12/16/32) is determined ONLY from the |
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424 | * data cluster count: |
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425 | * Disks with data cluster count < 4085 are FAT12. |
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426 | * Disks with data cluster count < 65525 are FAT16. |
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427 | * The rest is FAT32 (no FAT128 available yet :-) |
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428 | * |
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429 | * The number of data clusters is the |
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430 | * total capacity |
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431 | * minus reserved sectors |
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432 | * minus root directory ares |
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433 | * minus storage needed for the FAT (and its copy/copies). |
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434 | * |
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435 | * The last item once again depends on the FAT type and the cluster count. |
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436 | * |
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437 | * So here is what we do in this formatter: |
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438 | * - If a FAT type is requested from the caller, we try to modify |
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439 | * the cluster size, until the data cluster count is in range |
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440 | * - If no FAT type is given, we estimate a useful FAT type from |
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441 | * the disk capacity and then adapt the cluster size |
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442 | */ |
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443 | |
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444 | /* |
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445 | * determine characteristic values: |
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446 | * - number of sectors |
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447 | * - number of reserved sectors |
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448 | * - number of used sectors |
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449 | * - sectors per cluster |
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450 | */ |
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451 | /* |
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452 | * determine FAT type and sectors per cluster |
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453 | * depends on |
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454 | */ |
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455 | if (ret_val == 0) { |
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456 | fmt_params->sectors_per_cluster = 1; |
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457 | if ((rqdata != NULL) && |
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458 | (rqdata->fattype == MSDOS_FMT_FAT12)) { |
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459 | fmt_params->fattype = FAT_FAT12; |
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460 | } |
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461 | else if ((rqdata != NULL) && |
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462 | (rqdata->fattype == MSDOS_FMT_FAT16)) { |
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463 | fmt_params->fattype = FAT_FAT16; |
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464 | } |
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465 | else if ((rqdata != NULL) && |
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466 | (rqdata->fattype == MSDOS_FMT_FAT32)) { |
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467 | fmt_params->fattype = FAT_FAT32; |
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468 | } |
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469 | else if ((rqdata != NULL) && |
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470 | (rqdata->fattype != MSDOS_FMT_FATANY)) { |
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471 | ret_val = -1; |
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472 | errno = EINVAL; |
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473 | } |
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474 | else { |
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475 | /* |
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476 | * limiting values for disk size, fat type, sectors per cluster |
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477 | * NOTE: maximum sect_per_clust is arbitrarily choosen with values that |
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478 | * are a compromise concerning capacity and efficency |
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479 | */ |
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480 | if (fmt_params->totl_sector_cnt |
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481 | < ((uint32_t)FAT_FAT12_MAX_CLN)*8) { |
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482 | fmt_params->fattype = FAT_FAT12; |
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483 | /* start trying with small clusters */ |
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484 | fmt_params->sectors_per_cluster = 2; |
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485 | } |
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486 | else if (fmt_params->totl_sector_cnt |
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487 | < ((uint32_t)FAT_FAT16_MAX_CLN)*32) { |
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488 | fmt_params->fattype = FAT_FAT16; |
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489 | /* start trying with small clusters */ |
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490 | fmt_params->sectors_per_cluster = 2; |
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491 | } |
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492 | else { |
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493 | #define ONE_GB (1024L * 1024L * 1024L) |
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494 | uint32_t gigs = (total_size + ONE_GB) / ONE_GB; |
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495 | int b; |
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496 | fmt_params->fattype = FAT_FAT32; |
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497 | /* scale with the size of disk... */ |
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498 | for (b = 31; b > 0; b--) |
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499 | if ((gigs & (1 << b)) != 0) |
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500 | break; |
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501 | fmt_params->sectors_per_cluster = 1 << b; |
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502 | } |
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503 | } |
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504 | /* |
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505 | * try to use user requested cluster size |
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506 | */ |
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507 | if ((rqdata != NULL) && |
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508 | (rqdata->sectors_per_cluster > 0)) { |
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509 | fmt_params->sectors_per_cluster = |
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510 | rqdata->sectors_per_cluster; |
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511 | } |
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512 | /* |
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513 | * check sectors per cluster. |
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514 | * must be power of 2 |
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515 | * must be smaller than or equal to 128 |
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516 | * sectors_per_cluster*bytes_per_sector must not be bigger than 32K |
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517 | */ |
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518 | for (onebit = 128;onebit >= 1;onebit = onebit>>1) { |
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519 | if (fmt_params->sectors_per_cluster >= onebit) { |
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520 | fmt_params->sectors_per_cluster = onebit; |
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521 | if (fmt_params->sectors_per_cluster |
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522 | <= 32768L/fmt_params->bytes_per_sector) { |
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523 | /* value is small enough so this value is ok */ |
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524 | onebit = 1; |
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525 | } |
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526 | } |
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527 | } |
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528 | } |
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529 | |
---|
530 | if (ret_val == 0) { |
---|
531 | msdos_format_printf (rqdata, MSDOS_FMT_INFO_LEVEL_DETAIL, |
---|
532 | "sectors per cluster: %d\n", fmt_params->sectors_per_cluster); |
---|
533 | |
---|
534 | if (fmt_params->fattype == FAT_FAT32) { |
---|
535 | /* recommended: for FAT32, always set reserved sector count to 32 */ |
---|
536 | fmt_params->rsvd_sector_cnt = 32; |
---|
537 | /* for FAT32, always set files per root directory 0 */ |
---|
538 | fmt_params->files_per_root_dir = 0; |
---|
539 | /* location of copy of MBR */ |
---|
540 | fmt_params->mbr_copy_sec = 6; |
---|
541 | /* location of fsinfo sector */ |
---|
542 | fmt_params->fsinfo_sec = 1; |
---|
543 | |
---|
544 | } |
---|
545 | else { |
---|
546 | /* recommended: for FAT12/FAT16, always set reserved sector count to 1 */ |
---|
547 | fmt_params->rsvd_sector_cnt = 1; |
---|
548 | /* recommended: for FAT16, set files per root directory to 512 */ |
---|
549 | /* for FAT12/FAT16, set files per root directory */ |
---|
550 | /* must fill up an even count of sectors */ |
---|
551 | if ((rqdata != NULL) && |
---|
552 | (rqdata->files_per_root_dir > 0)) { |
---|
553 | fmt_params->files_per_root_dir = rqdata->files_per_root_dir; |
---|
554 | } |
---|
555 | else { |
---|
556 | if (fmt_params->fattype == FAT_FAT16) { |
---|
557 | fmt_params->files_per_root_dir = 512; |
---|
558 | } |
---|
559 | else { |
---|
560 | fmt_params->files_per_root_dir = 64; |
---|
561 | } |
---|
562 | } |
---|
563 | fmt_params->files_per_root_dir = (fmt_params->files_per_root_dir + |
---|
564 | (2*fmt_params->bytes_per_sector/ |
---|
565 | FAT_DIRENTRY_SIZE-1)); |
---|
566 | fmt_params->files_per_root_dir -= (fmt_params->files_per_root_dir % |
---|
567 | (2*fmt_params->bytes_per_sector |
---|
568 | /FAT_DIRENTRY_SIZE)); |
---|
569 | } |
---|
570 | fmt_params->root_dir_sectors = |
---|
571 | (((fmt_params->files_per_root_dir * FAT_DIRENTRY_SIZE) |
---|
572 | + fmt_params->bytes_per_sector - 1) |
---|
573 | / fmt_params->bytes_per_sector); |
---|
574 | } |
---|
575 | if (ret_val == 0) { |
---|
576 | fatdata_sect_cnt = (fmt_params->totl_sector_cnt - |
---|
577 | fmt_params->rsvd_sector_cnt - |
---|
578 | fmt_params->root_dir_sectors); |
---|
579 | |
---|
580 | /* |
---|
581 | * check values to get legal arrangement of FAT type and cluster count |
---|
582 | */ |
---|
583 | |
---|
584 | ret_val = msdos_format_eval_sectors_per_cluster |
---|
585 | (fmt_params->fattype, |
---|
586 | fmt_params->bytes_per_sector, |
---|
587 | fatdata_sect_cnt, |
---|
588 | fmt_params->fat_num, |
---|
589 | fmt_params->sectors_per_cluster, |
---|
590 | §ors_per_cluster_adj, |
---|
591 | &(fmt_params->sectors_per_fat)); |
---|
592 | fmt_params->sectors_per_cluster = sectors_per_cluster_adj; |
---|
593 | } |
---|
594 | |
---|
595 | /* |
---|
596 | * determine media code |
---|
597 | */ |
---|
598 | if (ret_val == 0) { |
---|
599 | if ((rqdata != NULL) && |
---|
600 | (rqdata->media != 0)) { |
---|
601 | const char valid_media_codes[] = |
---|
602 | {0xF0,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}; |
---|
603 | if (NULL==memchr(valid_media_codes, |
---|
604 | rqdata->media, |
---|
605 | sizeof(valid_media_codes))) { |
---|
606 | ret_val = -1; |
---|
607 | errno = EINVAL; |
---|
608 | } |
---|
609 | else { |
---|
610 | fmt_params->media_code = rqdata->media; |
---|
611 | } |
---|
612 | } |
---|
613 | else { |
---|
614 | fmt_params->media_code = FAT_BR_MEDIA_FIXED; |
---|
615 | } |
---|
616 | } |
---|
617 | /* |
---|
618 | * determine location and size of root directory |
---|
619 | * for formatting |
---|
620 | */ |
---|
621 | if (fmt_params->root_dir_sectors > 0) { |
---|
622 | fmt_params->root_dir_start_sec = |
---|
623 | fmt_params->rsvd_sector_cnt |
---|
624 | + (fmt_params-> fat_num*fmt_params->sectors_per_fat); |
---|
625 | fmt_params->root_dir_fmt_sec_cnt = fmt_params->root_dir_sectors; |
---|
626 | } |
---|
627 | else { |
---|
628 | /* |
---|
629 | * for FAT32: root directory is in cluster 2 |
---|
630 | */ |
---|
631 | fmt_params->root_dir_start_sec = |
---|
632 | fmt_params->rsvd_sector_cnt |
---|
633 | + (fmt_params-> fat_num*fmt_params->sectors_per_fat); |
---|
634 | fmt_params->root_dir_fmt_sec_cnt = fmt_params->sectors_per_cluster; |
---|
635 | } |
---|
636 | /* |
---|
637 | * determine usable OEMName |
---|
638 | */ |
---|
639 | if (ret_val == 0) { |
---|
640 | const char *from; |
---|
641 | char *to = fmt_params->OEMName; |
---|
642 | int cnt; |
---|
643 | from = "RTEMS"; /* default: make "from" point to OS Name */ |
---|
644 | if ((rqdata != NULL) && |
---|
645 | (rqdata->OEMName != NULL)) { |
---|
646 | from = rqdata->OEMName; |
---|
647 | } |
---|
648 | for (cnt = 0; |
---|
649 | cnt < (sizeof(fmt_params->OEMName)-1); |
---|
650 | cnt++) { |
---|
651 | if (isprint(*from)) { |
---|
652 | *to++ = *from++; |
---|
653 | } |
---|
654 | else { |
---|
655 | /* |
---|
656 | * non-printable character in given name, so keep stuck |
---|
657 | * at that character and replace all following characters |
---|
658 | * with a ' ' |
---|
659 | */ |
---|
660 | *to++=' '; |
---|
661 | } |
---|
662 | *to = '\0'; |
---|
663 | } |
---|
664 | } |
---|
665 | |
---|
666 | /* |
---|
667 | * determine usable Volume Label |
---|
668 | */ |
---|
669 | if (ret_val == 0) { |
---|
670 | const char *from; |
---|
671 | char *to = fmt_params->VolLabel; |
---|
672 | int cnt; |
---|
673 | from = ""; /* default: make "from" point to empty string */ |
---|
674 | if ((rqdata != NULL) && |
---|
675 | (rqdata->VolLabel != NULL)) { |
---|
676 | from = rqdata->VolLabel; |
---|
677 | fmt_params->VolLabel_present = true; |
---|
678 | } |
---|
679 | for (cnt = 0; |
---|
680 | cnt < (sizeof(fmt_params->VolLabel)-1); |
---|
681 | cnt++) { |
---|
682 | if (isprint(*from)) { |
---|
683 | *to++ = *from++; |
---|
684 | } |
---|
685 | else { |
---|
686 | /* |
---|
687 | * non-printable character in given name, so keep stuck |
---|
688 | * at that character and replace all following characters |
---|
689 | * with a ' ' |
---|
690 | */ |
---|
691 | *to++=' '; |
---|
692 | } |
---|
693 | *to = '\0'; |
---|
694 | } |
---|
695 | } |
---|
696 | |
---|
697 | /* |
---|
698 | * determine usable Volume ID |
---|
699 | */ |
---|
700 | if (ret_val == 0) { |
---|
701 | msdos_format_gen_volid(&(fmt_params->vol_id)); |
---|
702 | } |
---|
703 | /* |
---|
704 | * Phuuu.... That's it. |
---|
705 | */ |
---|
706 | if (ret_val != 0) { |
---|
707 | rtems_set_errno_and_return_minus_one(ret_val); |
---|
708 | } |
---|
709 | else { |
---|
710 | return 0; |
---|
711 | } |
---|
712 | } |
---|
713 | /*=========================================================================*\ |
---|
714 | | Function: | |
---|
715 | \*-------------------------------------------------------------------------*/ |
---|
716 | static int msdos_format_gen_mbr |
---|
717 | ( |
---|
718 | /*-------------------------------------------------------------------------*\ |
---|
719 | | Purpose: | |
---|
720 | | create master boot record content from parameter set | |
---|
721 | +---------------------------------------------------------------------------+ |
---|
722 | | Input Parameters: | |
---|
723 | \*-------------------------------------------------------------------------*/ |
---|
724 | char mbr[], /* sector buffer */ |
---|
725 | const msdos_format_param_t *fmt_params/* computed fmt parameters */ |
---|
726 | ) |
---|
727 | /*-------------------------------------------------------------------------*\ |
---|
728 | | Return Value: | |
---|
729 | | 0, if success, -1 and errno if failed | |
---|
730 | \*=========================================================================*/ |
---|
731 | { |
---|
732 | uint32_t total_sectors_num16 = 0; |
---|
733 | uint32_t total_sectors_num32 = 0; |
---|
734 | |
---|
735 | /* store total sector count in either 16 or 32 bit field in mbr */ |
---|
736 | if (fmt_params->totl_sector_cnt < 0x10000) { |
---|
737 | total_sectors_num16 = fmt_params->totl_sector_cnt; |
---|
738 | } |
---|
739 | else { |
---|
740 | total_sectors_num32 = fmt_params->totl_sector_cnt; |
---|
741 | } |
---|
742 | /* |
---|
743 | * finally we are there: let's fill in the values into the MBR |
---|
744 | * but first clear the MRB leaving the partition table. |
---|
745 | */ |
---|
746 | #define RTEMS_IDE_PARTITION_TABLE_OFFSET 0x1be |
---|
747 | #define RTEMS_IDE_PARTITION_TABLE_SIZE (4 * 16) |
---|
748 | memset(mbr,0,RTEMS_IDE_PARTITION_TABLE_OFFSET); |
---|
749 | memset(mbr + RTEMS_IDE_PARTITION_TABLE_OFFSET + RTEMS_IDE_PARTITION_TABLE_SIZE, |
---|
750 | 0, |
---|
751 | FAT_TOTAL_MBR_SIZE - (RTEMS_IDE_PARTITION_TABLE_OFFSET + RTEMS_IDE_PARTITION_TABLE_SIZE)); |
---|
752 | /* |
---|
753 | * FIXME: fill jmpBoot and Boot code... |
---|
754 | * with 0xEB,.... |
---|
755 | */ |
---|
756 | /* |
---|
757 | * fill OEMName |
---|
758 | */ |
---|
759 | memcpy(FAT_GET_ADDR_BR_OEMNAME(mbr), |
---|
760 | fmt_params->OEMName, |
---|
761 | FAT_BR_OEMNAME_SIZE); |
---|
762 | FAT_SET_BR_BYTES_PER_SECTOR(mbr , fmt_params->bytes_per_sector); |
---|
763 | FAT_SET_BR_SECTORS_PER_CLUSTER(mbr , fmt_params->sectors_per_cluster); |
---|
764 | FAT_SET_BR_RESERVED_SECTORS_NUM(mbr, fmt_params->rsvd_sector_cnt); |
---|
765 | |
---|
766 | /* number of FATs on medium */ |
---|
767 | FAT_SET_BR_FAT_NUM(mbr , 2); /* standard/recommended value */ |
---|
768 | FAT_SET_BR_FILES_PER_ROOT_DIR(mbr , fmt_params->files_per_root_dir); |
---|
769 | FAT_SET_BR_TOTAL_SECTORS_NUM16(mbr , total_sectors_num16); |
---|
770 | FAT_SET_BR_MEDIA(mbr , fmt_params->media_code); |
---|
771 | |
---|
772 | FAT_SET_BR_SECTORS_PER_TRACK(mbr , 255); /* only needed for INT13... */ |
---|
773 | FAT_SET_BR_NUMBER_OF_HEADS(mbr , 6); /* only needed for INT13... */ |
---|
774 | FAT_SET_BR_HIDDEN_SECTORS(mbr , 1); /* only needed for INT13... */ |
---|
775 | |
---|
776 | FAT_SET_BR_TOTAL_SECTORS_NUM32(mbr , total_sectors_num32); |
---|
777 | if (fmt_params->fattype != FAT_FAT32) { |
---|
778 | FAT_SET_BR_SECTORS_PER_FAT(mbr ,fmt_params->sectors_per_fat); |
---|
779 | FAT_SET_BR_DRVNUM(mbr , 0); /* only needed for INT13... */ |
---|
780 | FAT_SET_BR_RSVD1(mbr , 0); /* fill with zero */ |
---|
781 | FAT_SET_BR_BOOTSIG(mbr , FAT_BR_BOOTSIG_VAL); |
---|
782 | FAT_SET_BR_VOLID(mbr , fmt_params->vol_id); /* volume id */ |
---|
783 | memcpy(FAT_GET_ADDR_BR_VOLLAB(mbr), |
---|
784 | fmt_params->VolLabel, |
---|
785 | FAT_BR_VOLLAB_SIZE); |
---|
786 | memcpy(FAT_GET_ADDR_BR_FILSYSTYPE(mbr), |
---|
787 | (fmt_params->fattype == FAT_FAT12) |
---|
788 | ? "FAT12 " |
---|
789 | : "FAT16 ", |
---|
790 | FAT_BR_FILSYSTYPE_SIZE); |
---|
791 | } |
---|
792 | else { |
---|
793 | FAT_SET_BR_SECTORS_PER_FAT32(mbr ,fmt_params->sectors_per_fat); |
---|
794 | FAT_SET_BR_EXT_FLAGS(mbr , 0); |
---|
795 | FAT_SET_BR_FSVER(mbr , 0); /* FAT32 Version:0.0 */ |
---|
796 | FAT_SET_BR_FAT32_ROOT_CLUSTER(mbr , 2); /* put root dir to cluster 2 */ |
---|
797 | FAT_SET_BR_FAT32_FS_INFO_SECTOR(mbr, 1); /* Put fsinfo to rsrvd sec 1*/ |
---|
798 | FAT_SET_BR_FAT32_BK_BOOT_SECTOR(mbr, fmt_params->mbr_copy_sec ); /* Put MBR copy to rsrvd sec */ |
---|
799 | memset(FAT_GET_ADDR_BR_FAT32_RESERVED(mbr),0,FAT_BR_FAT32_RESERVED_SIZE); |
---|
800 | |
---|
801 | FAT_SET_BR_FAT32_DRVNUM(mbr , 0); /* only needed for INT13... */ |
---|
802 | FAT_SET_BR_FAT32_RSVD1(mbr , 0); /* fill with zero */ |
---|
803 | FAT_SET_BR_FAT32_BOOTSIG(mbr ,FAT_BR_FAT32_BOOTSIG_VAL); |
---|
804 | FAT_SET_BR_FAT32_VOLID(mbr , 0); /* not set */ |
---|
805 | memset(FAT_GET_ADDR_BR_FAT32_VOLLAB(mbr) ,0,FAT_BR_VOLLAB_SIZE); |
---|
806 | memcpy(FAT_GET_ADDR_BR_FAT32_FILSYSTYPE(mbr), |
---|
807 | "FAT32 ", |
---|
808 | FAT_BR_FILSYSTYPE_SIZE); |
---|
809 | } |
---|
810 | /* |
---|
811 | * add boot record signature |
---|
812 | */ |
---|
813 | FAT_SET_BR_SIGNATURE(mbr, FAT_BR_SIGNATURE_VAL); |
---|
814 | |
---|
815 | /* |
---|
816 | * add jump to boot loader at start of sector |
---|
817 | */ |
---|
818 | FAT_SET_VAL8(mbr,0,0xeb); |
---|
819 | FAT_SET_VAL8(mbr,1,0x3c); |
---|
820 | FAT_SET_VAL8(mbr,2,0x90); |
---|
821 | /* |
---|
822 | * FIXME: a nice little PC boot loader would be nice here. |
---|
823 | * but where can I get one for free? |
---|
824 | */ |
---|
825 | /* |
---|
826 | * Phuuu.... That's it. |
---|
827 | */ |
---|
828 | return 0; |
---|
829 | } |
---|
830 | |
---|
831 | /*=========================================================================*\ |
---|
832 | | Function: | |
---|
833 | \*-------------------------------------------------------------------------*/ |
---|
834 | static int msdos_format_gen_fsinfo |
---|
835 | ( |
---|
836 | /*-------------------------------------------------------------------------*\ |
---|
837 | | Purpose: | |
---|
838 | | create FAT32 fsinfo sector | |
---|
839 | +---------------------------------------------------------------------------+ |
---|
840 | | Input Parameters: | |
---|
841 | \*-------------------------------------------------------------------------*/ |
---|
842 | char fsinfo[] /* sector buffer */ |
---|
843 | ) |
---|
844 | /*-------------------------------------------------------------------------*\ |
---|
845 | | Return Value: | |
---|
846 | | 0, if success, -1 and errno if failed | |
---|
847 | \*=========================================================================*/ |
---|
848 | { |
---|
849 | /* |
---|
850 | * clear fsinfo sector data |
---|
851 | */ |
---|
852 | memset(fsinfo,0,FAT_TOTAL_FSINFO_SIZE); |
---|
853 | /* |
---|
854 | * write LEADSIG, STRUCTSIG, TRAILSIG |
---|
855 | */ |
---|
856 | FAT_SET_FSINFO_LEAD_SIGNATURE (fsinfo,FAT_FSINFO_LEAD_SIGNATURE_VALUE ); |
---|
857 | FAT_SET_FSINFO_STRUC_SIGNATURE(fsinfo,FAT_FSINFO_STRUC_SIGNATURE_VALUE); |
---|
858 | FAT_SET_FSINFO_TRAIL_SIGNATURE(fsinfo,FAT_FSINFO_TRAIL_SIGNATURE_VALUE); |
---|
859 | /* |
---|
860 | * write "empty" values for free cluster count and next cluster number |
---|
861 | */ |
---|
862 | FAT_SET_FSINFO_FREE_CLUSTER_COUNT(fsinfo+FAT_FSI_INFO, |
---|
863 | 0xffffffff); |
---|
864 | FAT_SET_FSINFO_NEXT_FREE_CLUSTER (fsinfo+FAT_FSI_INFO, |
---|
865 | 0xffffffff); |
---|
866 | return 0; |
---|
867 | } |
---|
868 | |
---|
869 | /*=========================================================================*\ |
---|
870 | | Function: | |
---|
871 | \*-------------------------------------------------------------------------*/ |
---|
872 | int msdos_format |
---|
873 | ( |
---|
874 | /*-------------------------------------------------------------------------*\ |
---|
875 | | Purpose: | |
---|
876 | | format device with msdos filesystem | |
---|
877 | +---------------------------------------------------------------------------+ |
---|
878 | | Input Parameters: | |
---|
879 | \*-------------------------------------------------------------------------*/ |
---|
880 | const char *devname, /* device name */ |
---|
881 | const msdos_format_request_param_t *rqdata /* requested fmt parameters */ |
---|
882 | /* set to NULL for automatic */ |
---|
883 | /* determination */ |
---|
884 | ) |
---|
885 | /*-------------------------------------------------------------------------*\ |
---|
886 | | Return Value: | |
---|
887 | | 0, if success, -1 and errno if failed | |
---|
888 | \*=========================================================================*/ |
---|
889 | { |
---|
890 | char tmp_sec[FAT_TOTAL_MBR_SIZE]; |
---|
891 | int rc; |
---|
892 | rtems_disk_device *dd = NULL; |
---|
893 | struct stat stat_buf; |
---|
894 | int ret_val = 0; |
---|
895 | int fd = -1; |
---|
896 | int i; |
---|
897 | msdos_format_param_t fmt_params; |
---|
898 | |
---|
899 | msdos_format_printf (rqdata, MSDOS_FMT_INFO_LEVEL_INFO, |
---|
900 | "formating: %s\n", devname); |
---|
901 | /* |
---|
902 | * sanity check on device |
---|
903 | */ |
---|
904 | msdos_format_printf (rqdata, MSDOS_FMT_INFO_LEVEL_DETAIL, |
---|
905 | "stat check: %s\n", devname); |
---|
906 | if (ret_val == 0) { |
---|
907 | rc = stat(devname, &stat_buf); |
---|
908 | ret_val = rc; |
---|
909 | } |
---|
910 | |
---|
911 | /* rtems feature: no block devices, all are character devices */ |
---|
912 | if ((ret_val == 0) && |
---|
913 | (!S_ISCHR(stat_buf.st_mode))) { |
---|
914 | errno = ENOTTY; |
---|
915 | ret_val = -1; |
---|
916 | } |
---|
917 | |
---|
918 | /* check that device is registered as block device and lock it */ |
---|
919 | if (ret_val == 0) { |
---|
920 | dd = rtems_disk_obtain(stat_buf.st_rdev); |
---|
921 | if (dd == NULL) { |
---|
922 | errno = ENOTTY; |
---|
923 | ret_val = -1; |
---|
924 | } |
---|
925 | } |
---|
926 | |
---|
927 | /* |
---|
928 | * open device for writing |
---|
929 | */ |
---|
930 | if (ret_val == 0) { |
---|
931 | msdos_format_printf (rqdata, MSDOS_FMT_INFO_LEVEL_DETAIL, |
---|
932 | "open device\n"); |
---|
933 | fd = open(devname, O_RDWR); |
---|
934 | if (fd == -1) |
---|
935 | { |
---|
936 | ret_val= -1; |
---|
937 | } |
---|
938 | } |
---|
939 | |
---|
940 | /* |
---|
941 | * compute formatting parameters |
---|
942 | */ |
---|
943 | if (ret_val == 0) { |
---|
944 | ret_val = msdos_format_determine_fmt_params(dd,rqdata,&fmt_params); |
---|
945 | } |
---|
946 | /* |
---|
947 | * if requested, write whole disk/partition with 0xe5 |
---|
948 | */ |
---|
949 | if ((ret_val == 0) && |
---|
950 | (rqdata != NULL) && |
---|
951 | !(rqdata->quick_format)) { |
---|
952 | ret_val = msdos_format_fill_sectors |
---|
953 | (rqdata, |
---|
954 | fd, |
---|
955 | 0, /* start sector */ |
---|
956 | fmt_params.totl_sector_cnt, /* sector count */ |
---|
957 | fmt_params.bytes_per_sector, |
---|
958 | 0xe5); |
---|
959 | } |
---|
960 | /* |
---|
961 | * create master boot record |
---|
962 | */ |
---|
963 | if (ret_val == 0) { |
---|
964 | /* |
---|
965 | * Read the current MBR to obtain the partition table. |
---|
966 | */ |
---|
967 | msdos_format_printf (rqdata, MSDOS_FMT_INFO_LEVEL_DETAIL, |
---|
968 | "read MRB sector\n"); |
---|
969 | ret_val = msdos_format_read_sec(fd, |
---|
970 | 0, |
---|
971 | fmt_params.bytes_per_sector, |
---|
972 | tmp_sec); |
---|
973 | if (ret_val == 0) { |
---|
974 | msdos_format_printf (rqdata, MSDOS_FMT_INFO_LEVEL_DETAIL, |
---|
975 | "generate MRB sector\n"); |
---|
976 | ret_val = msdos_format_gen_mbr(tmp_sec,&fmt_params); |
---|
977 | } |
---|
978 | |
---|
979 | /* |
---|
980 | * write master boot record to disk |
---|
981 | * also write copy of MBR to disk |
---|
982 | */ |
---|
983 | if (ret_val == 0) { |
---|
984 | msdos_format_printf (rqdata, MSDOS_FMT_INFO_LEVEL_DETAIL, |
---|
985 | "write MRB sector\n"); |
---|
986 | ret_val = msdos_format_write_sec(fd, |
---|
987 | 0, |
---|
988 | fmt_params.bytes_per_sector, |
---|
989 | tmp_sec); |
---|
990 | } |
---|
991 | if ((ret_val == 0) && |
---|
992 | (fmt_params.mbr_copy_sec != 0)) { |
---|
993 | /* |
---|
994 | * write copy of MBR |
---|
995 | */ |
---|
996 | msdos_format_printf (rqdata, MSDOS_FMT_INFO_LEVEL_DETAIL, |
---|
997 | "write back up MRB sector\n"); |
---|
998 | ret_val = msdos_format_write_sec(fd, |
---|
999 | fmt_params.mbr_copy_sec , |
---|
1000 | fmt_params.bytes_per_sector, |
---|
1001 | tmp_sec); |
---|
1002 | } |
---|
1003 | } |
---|
1004 | /* |
---|
1005 | * for FAT32: initialize info sector on disk |
---|
1006 | */ |
---|
1007 | if ((ret_val == 0) && |
---|
1008 | (fmt_params.fsinfo_sec != 0)) { |
---|
1009 | ret_val = msdos_format_gen_fsinfo(tmp_sec); |
---|
1010 | } |
---|
1011 | /* |
---|
1012 | * write fsinfo sector |
---|
1013 | */ |
---|
1014 | if ((ret_val == 0) && |
---|
1015 | (fmt_params.fsinfo_sec != 0)) { |
---|
1016 | ret_val = msdos_format_write_sec(fd, |
---|
1017 | fmt_params.fsinfo_sec, |
---|
1018 | fmt_params.bytes_per_sector, |
---|
1019 | tmp_sec); |
---|
1020 | } |
---|
1021 | /* |
---|
1022 | * write FAT as all empty |
---|
1023 | * -> write all FAT sectors as zero |
---|
1024 | */ |
---|
1025 | if (ret_val == 0) { |
---|
1026 | ret_val = msdos_format_fill_sectors |
---|
1027 | (rqdata, |
---|
1028 | fd, |
---|
1029 | fmt_params.rsvd_sector_cnt, /* start sector */ |
---|
1030 | fmt_params.fat_num*fmt_params.sectors_per_fat,/* sector count */ |
---|
1031 | fmt_params.bytes_per_sector, |
---|
1032 | 0x00); |
---|
1033 | } |
---|
1034 | /* |
---|
1035 | * clear/init root directory |
---|
1036 | * -> write all directory sectors as 0x00 |
---|
1037 | */ |
---|
1038 | if (ret_val == 0) { |
---|
1039 | ret_val = msdos_format_fill_sectors |
---|
1040 | (rqdata, |
---|
1041 | fd, |
---|
1042 | fmt_params.root_dir_start_sec, /* start sector */ |
---|
1043 | fmt_params.root_dir_fmt_sec_cnt, /* sector count */ |
---|
1044 | fmt_params.bytes_per_sector, |
---|
1045 | 0x00); |
---|
1046 | } |
---|
1047 | /* |
---|
1048 | * write volume label to first entry of directory |
---|
1049 | */ |
---|
1050 | if ((ret_val == 0) && fmt_params.VolLabel_present) { |
---|
1051 | memset(tmp_sec,0,sizeof(tmp_sec)); |
---|
1052 | memcpy(MSDOS_DIR_NAME(tmp_sec),fmt_params.VolLabel,MSDOS_SHORT_NAME_LEN); |
---|
1053 | *MSDOS_DIR_ATTR(tmp_sec) = MSDOS_ATTR_VOLUME_ID; |
---|
1054 | ret_val = msdos_format_write_sec |
---|
1055 | (fd, |
---|
1056 | fmt_params.root_dir_start_sec, |
---|
1057 | fmt_params.bytes_per_sector, |
---|
1058 | tmp_sec); |
---|
1059 | } |
---|
1060 | /* |
---|
1061 | * write FAT entry 0 as (0xffffff00|Media_type)EOC, |
---|
1062 | * write FAT entry 1 as EOC |
---|
1063 | * allocate directory in a FAT32 FS |
---|
1064 | */ |
---|
1065 | if ((ret_val == 0) && fmt_params.VolLabel_present){ |
---|
1066 | /* |
---|
1067 | * empty sector: all clusters are free/do not link further on |
---|
1068 | */ |
---|
1069 | memset(tmp_sec,0,sizeof(tmp_sec)); |
---|
1070 | |
---|
1071 | switch(fmt_params.fattype) { |
---|
1072 | case FAT_FAT12: |
---|
1073 | /* LSBits of FAT entry 0: media_type */ |
---|
1074 | FAT_SET_VAL8(tmp_sec,0,(fmt_params.media_code)); |
---|
1075 | /* MSBits of FAT entry 0:0xf, LSBits of FAT entry 1: LSB of EOC */ |
---|
1076 | FAT_SET_VAL8(tmp_sec,1,(0x0f | (FAT_FAT12_EOC << 4))); |
---|
1077 | /* MSBits of FAT entry 1: MSBits of EOC */ |
---|
1078 | FAT_SET_VAL8(tmp_sec,2,(FAT_FAT12_EOC >> 4)); |
---|
1079 | break; |
---|
1080 | |
---|
1081 | case FAT_FAT16: |
---|
1082 | /* FAT entry 0: 0xff00|media_type */ |
---|
1083 | FAT_SET_VAL16(tmp_sec,0,0xff00|fmt_params.media_code); |
---|
1084 | /* FAT entry 1: EOC */ |
---|
1085 | FAT_SET_VAL16(tmp_sec,2,FAT_FAT16_EOC); |
---|
1086 | break; |
---|
1087 | |
---|
1088 | case FAT_FAT32: |
---|
1089 | /* FAT entry 0: 0xffffff00|media_type */ |
---|
1090 | FAT_SET_VAL32(tmp_sec,0,0xffffff00|fmt_params.media_code); |
---|
1091 | /* FAT entry 1: EOC */ |
---|
1092 | FAT_SET_VAL32(tmp_sec,4,FAT_FAT32_EOC); |
---|
1093 | break; |
---|
1094 | |
---|
1095 | default: |
---|
1096 | ret_val = -1; |
---|
1097 | errno = EINVAL; |
---|
1098 | } |
---|
1099 | if (fmt_params.fattype == FAT_FAT32) { |
---|
1100 | /* |
---|
1101 | * only first valid cluster (cluster number 2) belongs |
---|
1102 | * to root directory, and is end of chain |
---|
1103 | * mark this in every copy of the FAT |
---|
1104 | */ |
---|
1105 | FAT_SET_VAL32(tmp_sec,8,FAT_FAT32_EOC); |
---|
1106 | } |
---|
1107 | for (i = 0; |
---|
1108 | (i < fmt_params.fat_num) && (ret_val == 0); |
---|
1109 | i++) { |
---|
1110 | ret_val = msdos_format_write_sec |
---|
1111 | (fd, |
---|
1112 | fmt_params.rsvd_sector_cnt |
---|
1113 | + (i * fmt_params.sectors_per_fat), |
---|
1114 | fmt_params.bytes_per_sector, |
---|
1115 | tmp_sec); |
---|
1116 | } |
---|
1117 | } |
---|
1118 | /* |
---|
1119 | * cleanup: |
---|
1120 | * sync and unlock disk |
---|
1121 | * free any data structures (not needed now) |
---|
1122 | */ |
---|
1123 | if (fd != -1) { |
---|
1124 | close(fd); |
---|
1125 | } |
---|
1126 | if (dd != NULL) { |
---|
1127 | rtems_disk_release(dd); |
---|
1128 | } |
---|
1129 | return ret_val; |
---|
1130 | } |
---|