1 | /** |
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2 | * @file |
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3 | * |
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4 | * @brief Block Device Partition Management |
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5 | * @ingroup rtems_bdpart |
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6 | */ |
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7 | |
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8 | /* |
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9 | * Copyright (c) 2009, 2010 |
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10 | * embedded brains GmbH |
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11 | * Obere Lagerstr. 30 |
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12 | * D-82178 Puchheim |
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13 | * Germany |
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14 | * <rtems@embedded-brains.de> |
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15 | * |
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16 | * The license and distribution terms for this file may be |
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17 | * found in the file LICENSE in this distribution or at |
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18 | * http://www.rtems.com/license/LICENSE. |
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19 | */ |
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20 | |
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21 | #ifdef HAVE_CONFIG_H |
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22 | #include "config.h" |
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23 | #endif |
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24 | |
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25 | #include <sys/stat.h> |
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26 | #include <fcntl.h> |
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27 | #include <string.h> |
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28 | |
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29 | #include <rtems.h> |
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30 | #include <rtems/bdbuf.h> |
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31 | #include <rtems/bdpart.h> |
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32 | #include <rtems/endian.h> |
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33 | |
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34 | #define RTEMS_BDPART_MBR_PARTITION_TYPE( type) \ |
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35 | { \ |
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36 | (type), 0xa2U, 0x2eU, 0x38U, \ |
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37 | 0x38U, 0xb5U, 0xdeU, 0x11U, \ |
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38 | 0xbcU, 0x13U, 0x00U, 0x1dU, \ |
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39 | 0x09U, 0xb0U, 0x5fU, 0xa4U \ |
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40 | } |
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41 | |
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42 | static const uuid_t RTEMS_BDPART_MBR_MASTER_TYPE = |
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43 | RTEMS_BDPART_MBR_PARTITION_TYPE( RTEMS_BDPART_MBR_EMPTY); |
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44 | |
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45 | void rtems_bdpart_to_partition_type( uint8_t mbr_type, uuid_t type) |
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46 | { |
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47 | type [0] = mbr_type; |
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48 | memcpy( type + 1, RTEMS_BDPART_MBR_MASTER_TYPE + 1, sizeof( uuid_t) - 1); |
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49 | } |
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50 | |
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51 | bool rtems_bdpart_to_mbr_partition_type( |
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52 | const uuid_t type, |
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53 | uint8_t *mbr_type |
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54 | ) |
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55 | { |
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56 | *mbr_type = rtems_bdpart_mbr_partition_type( type); |
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57 | |
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58 | return memcmp( |
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59 | type + 1, |
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60 | RTEMS_BDPART_MBR_MASTER_TYPE + 1, |
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61 | sizeof( uuid_t) - 1 |
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62 | ) == 0; |
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63 | } |
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64 | |
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65 | /* |
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66 | * FIXME: This code should the deviceio interface and not the bdbug interface. |
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67 | */ |
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68 | rtems_status_code rtems_bdpart_get_disk_data( |
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69 | const char *disk_name, |
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70 | int *fd_ptr, |
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71 | rtems_disk_device **dd_ptr, |
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72 | rtems_blkdev_bnum *disk_end |
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73 | ) |
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74 | { |
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75 | rtems_status_code sc = RTEMS_SUCCESSFUL; |
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76 | int rv = 0; |
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77 | int fd; |
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78 | rtems_disk_device *dd = NULL; |
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79 | rtems_blkdev_bnum disk_begin = 0; |
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80 | rtems_blkdev_bnum block_size = 0; |
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81 | |
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82 | /* Open device file */ |
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83 | fd = open( disk_name, O_RDWR); |
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84 | if (fd < 0) { |
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85 | sc = RTEMS_INVALID_NAME; |
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86 | goto out; |
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87 | } |
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88 | |
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89 | /* Get disk handle */ |
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90 | rv = rtems_disk_fd_get_disk_device( fd, &dd); |
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91 | if (rv != 0) { |
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92 | sc = RTEMS_INVALID_NAME; |
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93 | goto error; |
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94 | } |
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95 | |
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96 | /* Get disk begin, end and block size */ |
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97 | disk_begin = dd->start; |
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98 | *disk_end = dd->size; |
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99 | block_size = dd->block_size; |
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100 | |
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101 | /* Check block size */ |
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102 | if (block_size < RTEMS_BDPART_BLOCK_SIZE) { |
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103 | sc = RTEMS_IO_ERROR; |
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104 | goto error; |
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105 | } |
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106 | |
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107 | /* Check that we have do not have a logical disk */ |
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108 | if (disk_begin != 0) { |
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109 | sc = RTEMS_IO_ERROR; |
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110 | goto error; |
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111 | } |
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112 | |
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113 | error: |
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114 | |
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115 | if (sc == RTEMS_SUCCESSFUL && fd_ptr != NULL && dd_ptr != NULL) { |
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116 | *fd_ptr = fd; |
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117 | *dd_ptr = dd; |
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118 | } else { |
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119 | close( fd); |
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120 | } |
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121 | |
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122 | out: |
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123 | return sc; |
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124 | } |
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125 | |
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126 | static bool rtems_bdpart_is_valid_record( const uint8_t *data) |
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127 | { |
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128 | return data [RTEMS_BDPART_MBR_OFFSET_SIGNATURE_0] |
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129 | == RTEMS_BDPART_MBR_SIGNATURE_0 |
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130 | && data [RTEMS_BDPART_MBR_OFFSET_SIGNATURE_1] |
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131 | == RTEMS_BDPART_MBR_SIGNATURE_1; |
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132 | } |
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133 | |
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134 | static rtems_blkdev_bnum rtems_bdpart_next_ebr( const uint8_t *data) |
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135 | { |
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136 | rtems_blkdev_bnum begin = |
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137 | rtems_uint32_from_little_endian( data + RTEMS_BDPART_MBR_OFFSET_BEGIN); |
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138 | uint8_t type = data [RTEMS_BDPART_MBR_OFFSET_TYPE]; |
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139 | |
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140 | if (type == RTEMS_BDPART_MBR_EXTENDED) { |
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141 | return begin; |
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142 | } else { |
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143 | return 0; |
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144 | } |
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145 | } |
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146 | |
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147 | static rtems_status_code rtems_bdpart_read_mbr_partition( |
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148 | const uint8_t *data, |
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149 | rtems_bdpart_partition **p, |
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150 | const rtems_bdpart_partition *p_end, |
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151 | rtems_blkdev_bnum *ep_begin |
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152 | ) |
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153 | { |
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154 | rtems_blkdev_bnum begin = |
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155 | rtems_uint32_from_little_endian( data + RTEMS_BDPART_MBR_OFFSET_BEGIN); |
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156 | rtems_blkdev_bnum size = |
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157 | rtems_uint32_from_little_endian( data + RTEMS_BDPART_MBR_OFFSET_SIZE); |
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158 | rtems_blkdev_bnum end = begin + size; |
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159 | uint8_t type = data [RTEMS_BDPART_MBR_OFFSET_TYPE]; |
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160 | |
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161 | if (type == RTEMS_BDPART_MBR_EMPTY) { |
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162 | return RTEMS_SUCCESSFUL; |
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163 | } else if (*p == p_end) { |
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164 | return RTEMS_TOO_MANY; |
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165 | } else if (begin >= end) { |
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166 | return RTEMS_IO_ERROR; |
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167 | } else if (type == RTEMS_BDPART_MBR_EXTENDED) { |
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168 | if (ep_begin != NULL) { |
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169 | *ep_begin = begin; |
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170 | } |
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171 | } else { |
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172 | /* Increment partition index */ |
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173 | ++(*p); |
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174 | |
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175 | /* Clear partition */ |
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176 | memset( *p, 0, sizeof( rtems_bdpart_partition)); |
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177 | |
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178 | /* Set values */ |
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179 | (*p)->begin = begin; |
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180 | (*p)->end = end; |
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181 | rtems_bdpart_to_partition_type( type, (*p)->type); |
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182 | (*p)->flags = data [RTEMS_BDPART_MBR_OFFSET_FLAGS]; |
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183 | } |
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184 | |
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185 | return RTEMS_SUCCESSFUL; |
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186 | } |
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187 | |
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188 | static rtems_status_code rtems_bdpart_read_record( |
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189 | rtems_disk_device *dd, |
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190 | rtems_blkdev_bnum index, |
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191 | rtems_bdbuf_buffer **block |
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192 | ) |
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193 | { |
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194 | rtems_status_code sc = RTEMS_SUCCESSFUL; |
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195 | |
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196 | /* Release previous block if necessary */ |
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197 | if (*block != NULL) { |
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198 | sc = rtems_bdbuf_release( *block); |
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199 | if (sc != RTEMS_SUCCESSFUL) { |
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200 | return sc; |
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201 | } |
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202 | } |
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203 | |
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204 | /* Read the record block */ |
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205 | sc = rtems_bdbuf_read( dd, index, block); |
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206 | if (sc != RTEMS_SUCCESSFUL) { |
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207 | return sc; |
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208 | } |
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209 | |
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210 | /* just in case block did not get filled in */ |
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211 | if ( *block == NULL ) { |
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212 | return RTEMS_INVALID_ADDRESS; |
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213 | } |
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214 | |
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215 | /* Check MBR signature */ |
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216 | if (!rtems_bdpart_is_valid_record( (*block)->buffer)) { |
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217 | return RTEMS_IO_ERROR; |
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218 | } |
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219 | |
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220 | return RTEMS_SUCCESSFUL; |
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221 | } |
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222 | |
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223 | rtems_status_code rtems_bdpart_read( |
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224 | const char *disk_name, |
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225 | rtems_bdpart_format *format, |
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226 | rtems_bdpart_partition *pt, |
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227 | size_t *count |
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228 | ) |
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229 | { |
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230 | rtems_status_code sc = RTEMS_SUCCESSFUL; |
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231 | rtems_status_code esc = RTEMS_SUCCESSFUL; |
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232 | rtems_bdbuf_buffer *block = NULL; |
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233 | rtems_bdpart_partition *p = pt - 1; |
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234 | const rtems_bdpart_partition *p_end = pt + (count != NULL ? *count : 0); |
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235 | rtems_blkdev_bnum ep_begin = 0; /* Extended partition begin */ |
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236 | rtems_blkdev_bnum ebr = 0; /* Extended boot record block index */ |
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237 | rtems_blkdev_bnum disk_end = 0; |
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238 | size_t i = 0; |
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239 | const uint8_t *data = NULL; |
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240 | int fd = -1; |
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241 | rtems_disk_device *dd = NULL; |
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242 | |
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243 | /* Check parameter */ |
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244 | if (format == NULL || pt == NULL || count == NULL) { |
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245 | return RTEMS_INVALID_ADDRESS; |
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246 | } |
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247 | |
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248 | /* Set count to a save value */ |
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249 | *count = 0; |
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250 | |
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251 | /* Get disk data */ |
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252 | sc = rtems_bdpart_get_disk_data( disk_name, &fd, &dd, &disk_end); |
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253 | if (sc != RTEMS_SUCCESSFUL) { |
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254 | return sc; |
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255 | } |
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256 | |
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257 | /* Read MBR */ |
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258 | sc = rtems_bdpart_read_record( dd, 0, &block); |
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259 | if (sc != RTEMS_SUCCESSFUL) { |
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260 | esc = sc; |
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261 | goto cleanup; |
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262 | } |
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263 | |
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264 | /* Read the first partition entry */ |
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265 | data = block->buffer + RTEMS_BDPART_MBR_OFFSET_TABLE_0; |
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266 | sc = rtems_bdpart_read_mbr_partition( data, &p, p_end, &ep_begin); |
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267 | if (sc != RTEMS_SUCCESSFUL) { |
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268 | esc = sc; |
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269 | goto cleanup; |
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270 | } |
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271 | |
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272 | /* Determine if we have a MBR or GPT format */ |
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273 | if (rtems_bdpart_mbr_partition_type( p->type) == RTEMS_BDPART_MBR_GPT) { |
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274 | esc = RTEMS_NOT_IMPLEMENTED; |
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275 | goto cleanup; |
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276 | } |
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277 | |
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278 | /* Set format */ |
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279 | format->type = RTEMS_BDPART_FORMAT_MBR; |
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280 | format->mbr.disk_id = rtems_uint32_from_little_endian( |
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281 | block->buffer + RTEMS_BDPART_MBR_OFFSET_DISK_ID |
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282 | ); |
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283 | format->mbr.dos_compatibility = true; |
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284 | |
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285 | /* Iterate through the rest of the primary partition table */ |
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286 | for (i = 1; i < 4; ++i) { |
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287 | data += RTEMS_BDPART_MBR_TABLE_ENTRY_SIZE; |
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288 | |
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289 | sc = rtems_bdpart_read_mbr_partition( data, &p, p_end, &ep_begin); |
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290 | if (sc != RTEMS_SUCCESSFUL) { |
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291 | esc = sc; |
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292 | goto cleanup; |
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293 | } |
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294 | } |
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295 | |
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296 | /* Iterate through the logical partitions within the extended partition */ |
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297 | ebr = ep_begin; |
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298 | while (ebr != 0) { |
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299 | rtems_blkdev_bnum tmp = 0; |
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300 | |
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301 | /* Read EBR */ |
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302 | sc = rtems_bdpart_read_record( dd, ebr, &block); |
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303 | if (sc != RTEMS_SUCCESSFUL) { |
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304 | esc = sc; |
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305 | goto cleanup; |
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306 | } |
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307 | |
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308 | /* Read first partition entry */ |
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309 | sc = rtems_bdpart_read_mbr_partition( |
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310 | block->buffer + RTEMS_BDPART_MBR_OFFSET_TABLE_0, |
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311 | &p, |
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312 | p_end, |
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313 | NULL |
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314 | ); |
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315 | if (sc != RTEMS_SUCCESSFUL) { |
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316 | esc = sc; |
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317 | goto cleanup; |
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318 | } |
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319 | |
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320 | /* Adjust partition begin */ |
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321 | tmp = p->begin + ebr; |
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322 | if (tmp > p->begin) { |
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323 | p->begin = tmp; |
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324 | } else { |
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325 | esc = RTEMS_IO_ERROR; |
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326 | goto cleanup; |
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327 | } |
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328 | |
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329 | /* Adjust partition end */ |
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330 | tmp = p->end + ebr; |
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331 | if (tmp > p->end) { |
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332 | p->end = tmp; |
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333 | } else { |
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334 | esc = RTEMS_IO_ERROR; |
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335 | goto cleanup; |
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336 | } |
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337 | |
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338 | /* Read second partition entry for next EBR block */ |
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339 | ebr = rtems_bdpart_next_ebr( |
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340 | block->buffer + RTEMS_BDPART_MBR_OFFSET_TABLE_1 |
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341 | ); |
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342 | if (ebr != 0) { |
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343 | /* Adjust partition EBR block index */ |
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344 | tmp = ebr + ep_begin; |
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345 | if (tmp > ebr) { |
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346 | ebr = tmp; |
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347 | } else { |
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348 | esc = RTEMS_IO_ERROR; |
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349 | goto cleanup; |
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350 | } |
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351 | } |
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352 | } |
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353 | |
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354 | /* Return partition count */ |
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355 | *count = (size_t) (p - pt + 1); |
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356 | |
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357 | cleanup: |
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358 | |
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359 | if (fd >= 0) { |
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360 | close( fd); |
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361 | } |
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362 | |
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363 | if (block != NULL) { |
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364 | rtems_bdbuf_release( block); |
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365 | } |
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366 | |
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367 | return esc; |
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368 | } |
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