1 | /* |
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2 | * fat.c |
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3 | * |
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4 | * Low-level operations on a volume with FAT filesystem |
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5 | * |
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6 | * Copyright (C) 2001 OKTET Ltd., St.-Petersburg, Russia |
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7 | * Author: Eugeny S. Mints <Eugeny.Mints@oktet.ru> |
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8 | * |
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9 | * @(#) $Id$ |
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10 | */ |
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11 | |
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12 | #if HAVE_CONFIG_H |
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13 | #include "config.h" |
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14 | #endif |
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15 | |
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16 | #include <sys/types.h> |
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17 | #include <sys/stat.h> |
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18 | #include <fcntl.h> |
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19 | #include <unistd.h> |
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20 | #include <errno.h> |
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21 | #include <stdlib.h> |
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22 | #include <assert.h> |
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23 | |
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24 | #include <rtems/libio_.h> |
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25 | |
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26 | #include "fat.h" |
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27 | #include "fat_fat_operations.h" |
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28 | |
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29 | int |
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30 | fat_buf_access(fat_fs_info_t *fs_info, uint32_t blk, int op_type, |
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31 | rtems_bdbuf_buffer **buf) |
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32 | { |
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33 | rtems_status_code sc = RTEMS_SUCCESSFUL; |
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34 | uint8_t i; |
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35 | bool sec_of_fat; |
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36 | |
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37 | |
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38 | if (fs_info->c.state == FAT_CACHE_EMPTY) |
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39 | { |
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40 | if (op_type == FAT_OP_TYPE_READ) |
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41 | sc = rtems_bdbuf_read(fs_info->vol.dev, blk, &fs_info->c.buf); |
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42 | else |
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43 | sc = rtems_bdbuf_get(fs_info->vol.dev, blk, &fs_info->c.buf); |
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44 | if (sc != RTEMS_SUCCESSFUL) |
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45 | rtems_set_errno_and_return_minus_one(EIO); |
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46 | fs_info->c.blk_num = blk; |
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47 | fs_info->c.modified = 0; |
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48 | fs_info->c.state = FAT_CACHE_ACTUAL; |
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49 | } |
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50 | |
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51 | sec_of_fat = ((fs_info->c.blk_num >= fs_info->vol.fat_loc) && |
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52 | (fs_info->c.blk_num < fs_info->vol.rdir_loc)); |
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53 | |
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54 | if (fs_info->c.blk_num != blk) |
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55 | { |
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56 | if (fs_info->c.modified) |
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57 | { |
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58 | if (sec_of_fat && !fs_info->vol.mirror) |
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59 | memcpy(fs_info->sec_buf, fs_info->c.buf->buffer, |
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60 | fs_info->vol.bps); |
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61 | |
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62 | sc = rtems_bdbuf_release_modified(fs_info->c.buf); |
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63 | fs_info->c.state = FAT_CACHE_EMPTY; |
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64 | fs_info->c.modified = 0; |
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65 | if (sc != RTEMS_SUCCESSFUL) |
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66 | rtems_set_errno_and_return_minus_one(EIO); |
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67 | |
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68 | if (sec_of_fat && !fs_info->vol.mirror) |
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69 | { |
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70 | rtems_bdbuf_buffer *b; |
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71 | |
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72 | for (i = 1; i < fs_info->vol.fats; i++) |
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73 | { |
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74 | sc = rtems_bdbuf_get(fs_info->vol.dev, |
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75 | fs_info->c.blk_num + |
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76 | fs_info->vol.fat_length * i, |
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77 | &b); |
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78 | if ( sc != RTEMS_SUCCESSFUL) |
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79 | rtems_set_errno_and_return_minus_one(ENOMEM); |
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80 | memcpy(b->buffer, fs_info->sec_buf, fs_info->vol.bps); |
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81 | sc = rtems_bdbuf_release_modified(b); |
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82 | if ( sc != RTEMS_SUCCESSFUL) |
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83 | rtems_set_errno_and_return_minus_one(ENOMEM); |
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84 | } |
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85 | } |
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86 | } |
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87 | else |
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88 | { |
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89 | sc = rtems_bdbuf_release(fs_info->c.buf); |
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90 | fs_info->c.state = FAT_CACHE_EMPTY; |
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91 | if (sc != RTEMS_SUCCESSFUL) |
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92 | rtems_set_errno_and_return_minus_one(EIO); |
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93 | |
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94 | } |
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95 | if (op_type == FAT_OP_TYPE_READ) |
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96 | sc = rtems_bdbuf_read(fs_info->vol.dev, blk, &fs_info->c.buf); |
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97 | else |
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98 | sc = rtems_bdbuf_get(fs_info->vol.dev, blk, &fs_info->c.buf); |
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99 | if (sc != RTEMS_SUCCESSFUL) |
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100 | rtems_set_errno_and_return_minus_one(EIO); |
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101 | fs_info->c.blk_num = blk; |
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102 | fs_info->c.state = FAT_CACHE_ACTUAL; |
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103 | } |
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104 | *buf = fs_info->c.buf; |
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105 | return RC_OK; |
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106 | } |
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107 | |
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108 | int |
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109 | fat_buf_release(fat_fs_info_t *fs_info) |
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110 | { |
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111 | rtems_status_code sc = RTEMS_SUCCESSFUL; |
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112 | uint8_t i; |
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113 | bool sec_of_fat; |
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114 | |
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115 | if (fs_info->c.state == FAT_CACHE_EMPTY) |
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116 | return RC_OK; |
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117 | |
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118 | sec_of_fat = ((fs_info->c.blk_num >= fs_info->vol.fat_loc) && |
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119 | (fs_info->c.blk_num < fs_info->vol.rdir_loc)); |
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120 | |
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121 | if (fs_info->c.modified) |
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122 | { |
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123 | if (sec_of_fat && !fs_info->vol.mirror) |
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124 | memcpy(fs_info->sec_buf, fs_info->c.buf->buffer, fs_info->vol.bps); |
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125 | |
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126 | sc = rtems_bdbuf_release_modified(fs_info->c.buf); |
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127 | if (sc != RTEMS_SUCCESSFUL) |
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128 | rtems_set_errno_and_return_minus_one(EIO); |
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129 | fs_info->c.modified = 0; |
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130 | |
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131 | if (sec_of_fat && !fs_info->vol.mirror) |
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132 | { |
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133 | rtems_bdbuf_buffer *b; |
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134 | |
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135 | for (i = 1; i < fs_info->vol.fats; i++) |
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136 | { |
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137 | sc = rtems_bdbuf_get(fs_info->vol.dev, |
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138 | fs_info->c.blk_num + |
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139 | fs_info->vol.fat_length * i, |
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140 | &b); |
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141 | if ( sc != RTEMS_SUCCESSFUL) |
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142 | rtems_set_errno_and_return_minus_one(ENOMEM); |
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143 | memcpy(b->buffer, fs_info->sec_buf, fs_info->vol.bps); |
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144 | sc = rtems_bdbuf_release_modified(b); |
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145 | if ( sc != RTEMS_SUCCESSFUL) |
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146 | rtems_set_errno_and_return_minus_one(ENOMEM); |
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147 | } |
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148 | } |
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149 | } |
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150 | else |
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151 | { |
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152 | sc = rtems_bdbuf_release(fs_info->c.buf); |
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153 | if (sc != RTEMS_SUCCESSFUL) |
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154 | rtems_set_errno_and_return_minus_one(EIO); |
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155 | } |
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156 | fs_info->c.state = FAT_CACHE_EMPTY; |
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157 | return RC_OK; |
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158 | } |
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159 | |
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160 | /* _fat_block_read -- |
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161 | * This function reads 'count' bytes from device filesystem is mounted on, |
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162 | * starts at 'start+offset' position where 'start' computed in sectors |
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163 | * and 'offset' is offset inside sector (reading may cross sectors |
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164 | * boundary; in this case assumed we want to read sequential sector(s)) |
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165 | * |
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166 | * PARAMETERS: |
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167 | * mt_entry - mount table entry |
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168 | * start - sector num to start read from |
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169 | * offset - offset inside sector 'start' |
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170 | * count - count of bytes to read |
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171 | * buff - buffer provided by user |
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172 | * |
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173 | * RETURNS: |
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174 | * bytes read on success, or -1 if error occured |
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175 | * and errno set appropriately |
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176 | */ |
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177 | ssize_t |
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178 | _fat_block_read( |
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179 | rtems_filesystem_mount_table_entry_t *mt_entry, |
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180 | uint32_t start, |
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181 | uint32_t offset, |
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182 | uint32_t count, |
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183 | void *buff |
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184 | ) |
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185 | { |
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186 | int rc = RC_OK; |
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187 | register fat_fs_info_t *fs_info = mt_entry->fs_info; |
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188 | ssize_t cmpltd = 0; |
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189 | uint32_t blk = start; |
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190 | uint32_t ofs = offset; |
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191 | rtems_bdbuf_buffer *block = NULL; |
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192 | uint32_t c = 0; |
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193 | |
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194 | while (count > 0) |
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195 | { |
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196 | rc = fat_buf_access(fs_info, blk, FAT_OP_TYPE_READ, &block); |
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197 | if (rc != RC_OK) |
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198 | return -1; |
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199 | |
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200 | c = MIN(count, (fs_info->vol.bps - ofs)); |
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201 | memcpy((buff + cmpltd), (block->buffer + ofs), c); |
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202 | |
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203 | count -= c; |
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204 | cmpltd += c; |
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205 | blk++; |
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206 | ofs = 0; |
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207 | } |
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208 | return cmpltd; |
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209 | } |
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210 | |
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211 | /* _fat_block_write -- |
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212 | * This function write 'count' bytes to device filesystem is mounted on, |
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213 | * starts at 'start+offset' position where 'start' computed in sectors |
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214 | * and 'offset' is offset inside sector (writing may cross sectors |
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215 | * boundary; in this case assumed we want to write sequential sector(s)) |
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216 | * |
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217 | * PARAMETERS: |
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218 | * mt_entry - mount table entry |
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219 | * start - sector num to start read from |
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220 | * offset - offset inside sector 'start' |
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221 | * count - count of bytes to write |
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222 | * buff - buffer provided by user |
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223 | * |
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224 | * RETURNS: |
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225 | * bytes written on success, or -1 if error occured |
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226 | * and errno set appropriately |
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227 | */ |
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228 | ssize_t |
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229 | _fat_block_write( |
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230 | rtems_filesystem_mount_table_entry_t *mt_entry, |
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231 | uint32_t start, |
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232 | uint32_t offset, |
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233 | uint32_t count, |
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234 | const void *buff) |
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235 | { |
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236 | int rc = RC_OK; |
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237 | fat_fs_info_t *fs_info = mt_entry->fs_info; |
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238 | ssize_t cmpltd = 0; |
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239 | uint32_t blk = start; |
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240 | uint32_t ofs = offset; |
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241 | rtems_bdbuf_buffer *block = NULL; |
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242 | uint32_t c = 0; |
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243 | |
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244 | while(count > 0) |
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245 | { |
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246 | c = MIN(count, (fs_info->vol.bps - ofs)); |
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247 | |
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248 | if (c == fs_info->vol.bps) |
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249 | rc = fat_buf_access(fs_info, blk, FAT_OP_TYPE_GET, &block); |
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250 | else |
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251 | rc = fat_buf_access(fs_info, blk, FAT_OP_TYPE_READ, &block); |
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252 | if (rc != RC_OK) |
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253 | return -1; |
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254 | |
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255 | memcpy((block->buffer + ofs), (buff + cmpltd), c); |
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256 | |
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257 | fat_buf_mark_modified(fs_info); |
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258 | |
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259 | count -= c; |
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260 | cmpltd +=c; |
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261 | blk++; |
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262 | ofs = 0; |
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263 | } |
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264 | return cmpltd; |
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265 | } |
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266 | |
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267 | /* _fat_block_release -- |
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268 | * This function works around the hack that hold a bdbuf and does |
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269 | * not release it. |
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270 | * |
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271 | * PARAMETERS: |
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272 | * mt_entry - mount table entry |
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273 | * |
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274 | * RETURNS: |
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275 | * 0 on success, or -1 if error occured and errno set appropriately |
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276 | */ |
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277 | int |
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278 | _fat_block_release( |
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279 | rtems_filesystem_mount_table_entry_t *mt_entry) |
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280 | { |
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281 | fat_fs_info_t *fs_info = mt_entry->fs_info; |
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282 | return fat_buf_release(fs_info); |
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283 | } |
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284 | |
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285 | /* fat_cluster_read -- |
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286 | * wrapper for reading a whole cluster at once |
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287 | * |
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288 | * PARAMETERS: |
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289 | * mt_entry - mount table entry |
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290 | * cln - number of cluster to read |
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291 | * buff - buffer provided by user |
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292 | * |
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293 | * RETURNS: |
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294 | * bytes read on success, or -1 if error occured |
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295 | * and errno set appropriately |
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296 | */ |
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297 | ssize_t |
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298 | fat_cluster_read( |
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299 | rtems_filesystem_mount_table_entry_t *mt_entry, |
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300 | uint32_t cln, |
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301 | void *buff |
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302 | ) |
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303 | { |
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304 | fat_fs_info_t *fs_info = mt_entry->fs_info; |
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305 | uint32_t fsec = 0; |
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306 | |
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307 | fsec = fat_cluster_num_to_sector_num(mt_entry, cln); |
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308 | |
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309 | return _fat_block_read(mt_entry, fsec, 0, |
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310 | fs_info->vol.spc << fs_info->vol.sec_log2, buff); |
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311 | } |
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312 | |
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313 | /* fat_cluster_write -- |
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314 | * wrapper for writting a whole cluster at once |
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315 | * |
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316 | * PARAMETERS: |
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317 | * mt_entry - mount table entry |
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318 | * cln - number of cluster to write |
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319 | * buff - buffer provided by user |
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320 | * |
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321 | * RETURNS: |
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322 | * bytes written on success, or -1 if error occured |
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323 | * and errno set appropriately |
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324 | */ |
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325 | ssize_t |
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326 | fat_cluster_write( |
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327 | rtems_filesystem_mount_table_entry_t *mt_entry, |
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328 | uint32_t cln, |
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329 | const void *buff |
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330 | ) |
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331 | { |
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332 | fat_fs_info_t *fs_info = mt_entry->fs_info; |
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333 | uint32_t fsec = 0; |
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334 | |
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335 | fsec = fat_cluster_num_to_sector_num(mt_entry, cln); |
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336 | |
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337 | return _fat_block_write(mt_entry, fsec, 0, |
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338 | fs_info->vol.spc << fs_info->vol.sec_log2, buff); |
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339 | } |
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340 | |
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341 | /* fat_init_volume_info -- |
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342 | * Get inforamtion about volume on which filesystem is mounted on |
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343 | * |
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344 | * PARAMETERS: |
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345 | * mt_entry - mount table entry |
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346 | * |
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347 | * RETURNS: |
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348 | * RC_OK on success, or -1 if error occured |
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349 | * and errno set appropriately |
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350 | */ |
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351 | int |
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352 | fat_init_volume_info(rtems_filesystem_mount_table_entry_t *mt_entry) |
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353 | { |
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354 | rtems_status_code sc = RTEMS_SUCCESSFUL; |
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355 | int rc = RC_OK; |
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356 | fat_fs_info_t *fs_info = mt_entry->fs_info; |
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357 | register fat_vol_t *vol = &fs_info->vol; |
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358 | uint32_t data_secs = 0; |
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359 | char boot_rec[FAT_MAX_BPB_SIZE]; |
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360 | char fs_info_sector[FAT_USEFUL_INFO_SIZE]; |
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361 | ssize_t ret = 0; |
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362 | struct stat stat_buf; |
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363 | int i = 0; |
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364 | rtems_bdbuf_buffer *block = NULL; |
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365 | |
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366 | rc = stat(mt_entry->dev, &stat_buf); |
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367 | if (rc == -1) |
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368 | return rc; |
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369 | |
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370 | /* Must be a block device. */ |
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371 | if (!S_ISBLK(stat_buf.st_mode)) |
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372 | rtems_set_errno_and_return_minus_one(ENOTTY); |
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373 | |
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374 | /* check that device is registred as block device and lock it */ |
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375 | vol->dd = rtems_disk_obtain(stat_buf.st_rdev); |
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376 | if (vol->dd == NULL) |
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377 | rtems_set_errno_and_return_minus_one(EIO); |
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378 | |
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379 | vol->dev = stat_buf.st_rdev; |
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380 | |
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381 | /* Read boot record */ |
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382 | /* FIXME: Asserts FAT_MAX_BPB_SIZE < bdbuf block size */ |
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383 | sc = rtems_bdbuf_read( vol->dev, 0, &block); |
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384 | if (sc != RTEMS_SUCCESSFUL) |
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385 | { |
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386 | rtems_disk_release(vol->dd); |
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387 | rtems_set_errno_and_return_minus_one( EIO); |
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388 | } |
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389 | |
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390 | memcpy( boot_rec, block->buffer, FAT_MAX_BPB_SIZE); |
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391 | |
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392 | sc = rtems_bdbuf_release( block); |
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393 | if (sc != RTEMS_SUCCESSFUL) |
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394 | { |
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395 | rtems_disk_release(vol->dd); |
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396 | rtems_set_errno_and_return_minus_one( EIO ); |
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397 | } |
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398 | |
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399 | /* Evaluate boot record */ |
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400 | vol->bps = FAT_GET_BR_BYTES_PER_SECTOR(boot_rec); |
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401 | |
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402 | if ( (vol->bps != 512) && |
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403 | (vol->bps != 1024) && |
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404 | (vol->bps != 2048) && |
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405 | (vol->bps != 4096)) |
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406 | { |
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407 | rtems_disk_release(vol->dd); |
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408 | rtems_set_errno_and_return_minus_one( EINVAL ); |
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409 | } |
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410 | |
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411 | for (vol->sec_mul = 0, i = (vol->bps >> FAT_SECTOR512_BITS); (i & 1) == 0; |
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412 | i >>= 1, vol->sec_mul++); |
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413 | for (vol->sec_log2 = 0, i = vol->bps; (i & 1) == 0; |
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414 | i >>= 1, vol->sec_log2++); |
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415 | |
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416 | vol->spc = FAT_GET_BR_SECTORS_PER_CLUSTER(boot_rec); |
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417 | /* |
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418 | * "sectors per cluster" of zero is invalid |
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419 | * (and would hang the following loop) |
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420 | */ |
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421 | if (vol->spc == 0) |
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422 | { |
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423 | rtems_disk_release(vol->dd); |
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424 | rtems_set_errno_and_return_minus_one(EINVAL); |
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425 | } |
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426 | |
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427 | for (vol->spc_log2 = 0, i = vol->spc; (i & 1) == 0; |
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428 | i >>= 1, vol->spc_log2++); |
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429 | |
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430 | /* |
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431 | * "bytes per cluster" value greater than 32K is invalid |
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432 | */ |
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433 | if ((vol->bpc = vol->bps << vol->spc_log2) > MS_BYTES_PER_CLUSTER_LIMIT) |
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434 | { |
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435 | rtems_disk_release(vol->dd); |
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436 | rtems_set_errno_and_return_minus_one(EINVAL); |
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437 | } |
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438 | |
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439 | for (vol->bpc_log2 = 0, i = vol->bpc; (i & 1) == 0; |
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440 | i >>= 1, vol->bpc_log2++); |
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441 | |
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442 | vol->fats = FAT_GET_BR_FAT_NUM(boot_rec); |
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443 | vol->fat_loc = FAT_GET_BR_RESERVED_SECTORS_NUM(boot_rec); |
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444 | |
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445 | vol->rdir_entrs = FAT_GET_BR_FILES_PER_ROOT_DIR(boot_rec); |
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446 | |
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447 | /* calculate the count of sectors occupied by the root directory */ |
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448 | vol->rdir_secs = ((vol->rdir_entrs * FAT_DIRENTRY_SIZE) + (vol->bps - 1)) / |
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449 | vol->bps; |
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450 | |
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451 | vol->rdir_size = vol->rdir_secs << vol->sec_log2; |
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452 | |
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453 | if ( (FAT_GET_BR_SECTORS_PER_FAT(boot_rec)) != 0) |
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454 | vol->fat_length = FAT_GET_BR_SECTORS_PER_FAT(boot_rec); |
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455 | else |
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456 | vol->fat_length = FAT_GET_BR_SECTORS_PER_FAT32(boot_rec); |
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457 | |
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458 | vol->data_fsec = vol->fat_loc + vol->fats * vol->fat_length + |
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459 | vol->rdir_secs; |
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460 | |
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461 | /* for FAT12/16 root dir starts at(sector) */ |
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462 | vol->rdir_loc = vol->fat_loc + vol->fats * vol->fat_length; |
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463 | |
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464 | if ( (FAT_GET_BR_TOTAL_SECTORS_NUM16(boot_rec)) != 0) |
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465 | vol->tot_secs = FAT_GET_BR_TOTAL_SECTORS_NUM16(boot_rec); |
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466 | else |
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467 | vol->tot_secs = FAT_GET_BR_TOTAL_SECTORS_NUM32(boot_rec); |
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468 | |
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469 | data_secs = vol->tot_secs - vol->data_fsec; |
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470 | |
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471 | vol->data_cls = data_secs / vol->spc; |
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472 | |
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473 | /* determine FAT type at least */ |
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474 | if ( vol->data_cls < FAT_FAT12_MAX_CLN) |
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475 | { |
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476 | vol->type = FAT_FAT12; |
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477 | vol->mask = FAT_FAT12_MASK; |
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478 | vol->eoc_val = FAT_FAT12_EOC; |
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479 | } |
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480 | else |
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481 | { |
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482 | if ( vol->data_cls < FAT_FAT16_MAX_CLN) |
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483 | { |
---|
484 | vol->type = FAT_FAT16; |
---|
485 | vol->mask = FAT_FAT16_MASK; |
---|
486 | vol->eoc_val = FAT_FAT16_EOC; |
---|
487 | } |
---|
488 | else |
---|
489 | { |
---|
490 | vol->type = FAT_FAT32; |
---|
491 | vol->mask = FAT_FAT32_MASK; |
---|
492 | vol->eoc_val = FAT_FAT32_EOC; |
---|
493 | } |
---|
494 | } |
---|
495 | |
---|
496 | if (vol->type == FAT_FAT32) |
---|
497 | { |
---|
498 | vol->rdir_cl = FAT_GET_BR_FAT32_ROOT_CLUSTER(boot_rec); |
---|
499 | |
---|
500 | vol->mirror = FAT_GET_BR_EXT_FLAGS(boot_rec) & FAT_BR_EXT_FLAGS_MIRROR; |
---|
501 | if (vol->mirror) |
---|
502 | vol->afat = FAT_GET_BR_EXT_FLAGS(boot_rec) & FAT_BR_EXT_FLAGS_FAT_NUM; |
---|
503 | else |
---|
504 | vol->afat = 0; |
---|
505 | |
---|
506 | vol->info_sec = FAT_GET_BR_FAT32_FS_INFO_SECTOR(boot_rec); |
---|
507 | if( vol->info_sec == 0 ) |
---|
508 | { |
---|
509 | rtems_disk_release(vol->dd); |
---|
510 | rtems_set_errno_and_return_minus_one( EINVAL ); |
---|
511 | } |
---|
512 | else |
---|
513 | { |
---|
514 | ret = _fat_block_read(mt_entry, vol->info_sec , 0, |
---|
515 | FAT_FSI_LEADSIG_SIZE, fs_info_sector); |
---|
516 | if ( ret < 0 ) |
---|
517 | { |
---|
518 | rtems_disk_release(vol->dd); |
---|
519 | return -1; |
---|
520 | } |
---|
521 | |
---|
522 | if (FAT_GET_FSINFO_LEAD_SIGNATURE(fs_info_sector) != |
---|
523 | FAT_FSINFO_LEAD_SIGNATURE_VALUE) |
---|
524 | { |
---|
525 | _fat_block_release(mt_entry); |
---|
526 | rtems_disk_release(vol->dd); |
---|
527 | rtems_set_errno_and_return_minus_one( EINVAL ); |
---|
528 | } |
---|
529 | else |
---|
530 | { |
---|
531 | ret = _fat_block_read(mt_entry, vol->info_sec , FAT_FSI_INFO, |
---|
532 | FAT_USEFUL_INFO_SIZE, fs_info_sector); |
---|
533 | if ( ret < 0 ) |
---|
534 | { |
---|
535 | _fat_block_release(mt_entry); |
---|
536 | rtems_disk_release(vol->dd); |
---|
537 | return -1; |
---|
538 | } |
---|
539 | |
---|
540 | vol->free_cls = FAT_GET_FSINFO_FREE_CLUSTER_COUNT(fs_info_sector); |
---|
541 | vol->next_cl = FAT_GET_FSINFO_NEXT_FREE_CLUSTER(fs_info_sector); |
---|
542 | rc = fat_fat32_update_fsinfo_sector(mt_entry, 0xFFFFFFFF, |
---|
543 | 0xFFFFFFFF); |
---|
544 | if ( rc != RC_OK ) |
---|
545 | { |
---|
546 | _fat_block_release(mt_entry); |
---|
547 | rtems_disk_release(vol->dd); |
---|
548 | return rc; |
---|
549 | } |
---|
550 | } |
---|
551 | } |
---|
552 | } |
---|
553 | else |
---|
554 | { |
---|
555 | vol->rdir_cl = 0; |
---|
556 | vol->mirror = 0; |
---|
557 | vol->afat = 0; |
---|
558 | vol->free_cls = 0xFFFFFFFF; |
---|
559 | vol->next_cl = 0xFFFFFFFF; |
---|
560 | } |
---|
561 | |
---|
562 | _fat_block_release(mt_entry); |
---|
563 | |
---|
564 | vol->afat_loc = vol->fat_loc + vol->fat_length * vol->afat; |
---|
565 | |
---|
566 | /* set up collection of fat-files fd */ |
---|
567 | fs_info->vhash = calloc(FAT_HASH_SIZE, sizeof(rtems_chain_control)); |
---|
568 | if ( fs_info->vhash == NULL ) |
---|
569 | { |
---|
570 | rtems_disk_release(vol->dd); |
---|
571 | rtems_set_errno_and_return_minus_one( ENOMEM ); |
---|
572 | } |
---|
573 | |
---|
574 | for (i = 0; i < FAT_HASH_SIZE; i++) |
---|
575 | rtems_chain_initialize_empty(fs_info->vhash + i); |
---|
576 | |
---|
577 | fs_info->rhash = calloc(FAT_HASH_SIZE, sizeof(rtems_chain_control)); |
---|
578 | if ( fs_info->rhash == NULL ) |
---|
579 | { |
---|
580 | rtems_disk_release(vol->dd); |
---|
581 | free(fs_info->vhash); |
---|
582 | rtems_set_errno_and_return_minus_one( ENOMEM ); |
---|
583 | } |
---|
584 | for (i = 0; i < FAT_HASH_SIZE; i++) |
---|
585 | rtems_chain_initialize_empty(fs_info->rhash + i); |
---|
586 | |
---|
587 | fs_info->uino_pool_size = FAT_UINO_POOL_INIT_SIZE; |
---|
588 | fs_info->uino_base = (vol->tot_secs << vol->sec_mul) << 4; |
---|
589 | fs_info->index = 0; |
---|
590 | fs_info->uino = (char *)calloc(fs_info->uino_pool_size, sizeof(char)); |
---|
591 | if ( fs_info->uino == NULL ) |
---|
592 | { |
---|
593 | rtems_disk_release(vol->dd); |
---|
594 | free(fs_info->vhash); |
---|
595 | free(fs_info->rhash); |
---|
596 | rtems_set_errno_and_return_minus_one( ENOMEM ); |
---|
597 | } |
---|
598 | fs_info->sec_buf = (uint8_t *)calloc(vol->bps, sizeof(uint8_t)); |
---|
599 | if (fs_info->sec_buf == NULL) |
---|
600 | { |
---|
601 | rtems_disk_release(vol->dd); |
---|
602 | free(fs_info->vhash); |
---|
603 | free(fs_info->rhash); |
---|
604 | free(fs_info->uino); |
---|
605 | rtems_set_errno_and_return_minus_one( ENOMEM ); |
---|
606 | } |
---|
607 | |
---|
608 | return RC_OK; |
---|
609 | } |
---|
610 | |
---|
611 | /* fat_shutdown_drive -- |
---|
612 | * Free all allocated resources and synchronize all necessary data |
---|
613 | * |
---|
614 | * PARAMETERS: |
---|
615 | * mt_entry - mount table entry |
---|
616 | * |
---|
617 | * RETURNS: |
---|
618 | * RC_OK on success, or -1 if error occured |
---|
619 | * and errno set appropriately |
---|
620 | */ |
---|
621 | int |
---|
622 | fat_shutdown_drive(rtems_filesystem_mount_table_entry_t *mt_entry) |
---|
623 | { |
---|
624 | int rc = RC_OK; |
---|
625 | fat_fs_info_t *fs_info = mt_entry->fs_info; |
---|
626 | int i = 0; |
---|
627 | |
---|
628 | if (fs_info->vol.type & FAT_FAT32) |
---|
629 | { |
---|
630 | rc = fat_fat32_update_fsinfo_sector(mt_entry, fs_info->vol.free_cls, |
---|
631 | fs_info->vol.next_cl); |
---|
632 | if ( rc != RC_OK ) |
---|
633 | rc = -1; |
---|
634 | } |
---|
635 | |
---|
636 | fat_buf_release(fs_info); |
---|
637 | |
---|
638 | if (rtems_bdbuf_syncdev(fs_info->vol.dev) != RTEMS_SUCCESSFUL) |
---|
639 | rc = -1; |
---|
640 | |
---|
641 | for (i = 0; i < FAT_HASH_SIZE; i++) |
---|
642 | { |
---|
643 | rtems_chain_node *node = NULL; |
---|
644 | rtems_chain_control *the_chain = fs_info->vhash + i; |
---|
645 | |
---|
646 | while ( (node = rtems_chain_get(the_chain)) != NULL ) |
---|
647 | free(node); |
---|
648 | } |
---|
649 | |
---|
650 | for (i = 0; i < FAT_HASH_SIZE; i++) |
---|
651 | { |
---|
652 | rtems_chain_node *node = NULL; |
---|
653 | rtems_chain_control *the_chain = fs_info->rhash + i; |
---|
654 | |
---|
655 | while ( (node = rtems_chain_get(the_chain)) != NULL ) |
---|
656 | free(node); |
---|
657 | } |
---|
658 | |
---|
659 | free(fs_info->vhash); |
---|
660 | free(fs_info->rhash); |
---|
661 | |
---|
662 | free(fs_info->uino); |
---|
663 | free(fs_info->sec_buf); |
---|
664 | rtems_disk_release(fs_info->vol.dd); |
---|
665 | |
---|
666 | if (rc) |
---|
667 | errno = EIO; |
---|
668 | return rc; |
---|
669 | } |
---|
670 | |
---|
671 | /* fat_init_clusters_chain -- |
---|
672 | * Zeroing contents of all clusters in the chain |
---|
673 | * |
---|
674 | * PARAMETERS: |
---|
675 | * mt_entry - mount table entry |
---|
676 | * start_cluster_num - num of first cluster in the chain |
---|
677 | * |
---|
678 | * RETURNS: |
---|
679 | * RC_OK on success, or -1 if error occured |
---|
680 | * and errno set appropriately |
---|
681 | */ |
---|
682 | int |
---|
683 | fat_init_clusters_chain( |
---|
684 | rtems_filesystem_mount_table_entry_t *mt_entry, |
---|
685 | uint32_t start_cln |
---|
686 | ) |
---|
687 | { |
---|
688 | int rc = RC_OK; |
---|
689 | ssize_t ret = 0; |
---|
690 | register fat_fs_info_t *fs_info = mt_entry->fs_info; |
---|
691 | uint32_t cur_cln = start_cln; |
---|
692 | char *buf; |
---|
693 | |
---|
694 | buf = calloc(fs_info->vol.bpc, sizeof(char)); |
---|
695 | if ( buf == NULL ) |
---|
696 | rtems_set_errno_and_return_minus_one( EIO ); |
---|
697 | |
---|
698 | while ((cur_cln & fs_info->vol.mask) < fs_info->vol.eoc_val) |
---|
699 | { |
---|
700 | ret = fat_cluster_write(mt_entry, cur_cln, buf); |
---|
701 | if ( ret == -1 ) |
---|
702 | { |
---|
703 | free(buf); |
---|
704 | return -1; |
---|
705 | } |
---|
706 | |
---|
707 | rc = fat_get_fat_cluster(mt_entry, cur_cln, &cur_cln); |
---|
708 | if ( rc != RC_OK ) |
---|
709 | { |
---|
710 | free(buf); |
---|
711 | return rc; |
---|
712 | } |
---|
713 | |
---|
714 | } |
---|
715 | free(buf); |
---|
716 | return rc; |
---|
717 | } |
---|
718 | |
---|
719 | #define FAT_UNIQ_INO_BASE 0x0FFFFF00 |
---|
720 | |
---|
721 | #define FAT_UNIQ_INO_IS_BUSY(index, arr) \ |
---|
722 | (((arr)[((index)>>3)]>>((index) & (8-1))) & 0x01) |
---|
723 | |
---|
724 | #define FAT_SET_UNIQ_INO_BUSY(index, arr) \ |
---|
725 | ((arr)[((index)>>3)] |= (0x01<<((index) & (8-1)))) |
---|
726 | |
---|
727 | #define FAT_SET_UNIQ_INO_FREE(index, arr) \ |
---|
728 | ((arr)[((index)>>3)] &= (~(0x01<<((index) & (8-1))))) |
---|
729 | |
---|
730 | /* fat_get_unique_ino -- |
---|
731 | * Allocate unique ino from unique ino pool |
---|
732 | * |
---|
733 | * PARAMETERS: |
---|
734 | * mt_entry - mount table entry |
---|
735 | * |
---|
736 | * RETURNS: |
---|
737 | * unique inode number on success, or 0 if there is no free unique inode |
---|
738 | * number in the pool |
---|
739 | * |
---|
740 | * ATTENTION: |
---|
741 | * 0 means FAILED !!! |
---|
742 | * |
---|
743 | */ |
---|
744 | uint32_t |
---|
745 | fat_get_unique_ino(rtems_filesystem_mount_table_entry_t *mt_entry) |
---|
746 | { |
---|
747 | register fat_fs_info_t *fs_info = mt_entry->fs_info; |
---|
748 | uint32_t j = 0; |
---|
749 | bool resrc_unsuff = false; |
---|
750 | |
---|
751 | while (!resrc_unsuff) |
---|
752 | { |
---|
753 | for (j = 0; j < fs_info->uino_pool_size; j++) |
---|
754 | { |
---|
755 | if (!FAT_UNIQ_INO_IS_BUSY(fs_info->index, fs_info->uino)) |
---|
756 | { |
---|
757 | FAT_SET_UNIQ_INO_BUSY(fs_info->index, fs_info->uino); |
---|
758 | return (fs_info->uino_base + fs_info->index); |
---|
759 | } |
---|
760 | fs_info->index++; |
---|
761 | if (fs_info->index >= fs_info->uino_pool_size) |
---|
762 | fs_info->index = 0; |
---|
763 | } |
---|
764 | |
---|
765 | if ((fs_info->uino_pool_size << 1) < (0x0FFFFFFF - fs_info->uino_base)) |
---|
766 | { |
---|
767 | fs_info->uino_pool_size <<= 1; |
---|
768 | fs_info->uino = realloc(fs_info->uino, fs_info->uino_pool_size); |
---|
769 | if (fs_info->uino != NULL) |
---|
770 | fs_info->index = fs_info->uino_pool_size; |
---|
771 | else |
---|
772 | resrc_unsuff = true; |
---|
773 | } |
---|
774 | else |
---|
775 | resrc_unsuff = true; |
---|
776 | } |
---|
777 | return 0; |
---|
778 | } |
---|
779 | |
---|
780 | /* fat_free_unique_ino -- |
---|
781 | * Return unique ino to unique ino pool |
---|
782 | * |
---|
783 | * PARAMETERS: |
---|
784 | * mt_entry - mount table entry |
---|
785 | * ino - inode number to free |
---|
786 | * |
---|
787 | * RETURNS: |
---|
788 | * None |
---|
789 | */ |
---|
790 | void |
---|
791 | fat_free_unique_ino( |
---|
792 | rtems_filesystem_mount_table_entry_t *mt_entry, |
---|
793 | uint32_t ino |
---|
794 | ) |
---|
795 | { |
---|
796 | fat_fs_info_t *fs_info = mt_entry->fs_info; |
---|
797 | |
---|
798 | FAT_SET_UNIQ_INO_FREE((ino - fs_info->uino_base), fs_info->uino); |
---|
799 | } |
---|
800 | |
---|
801 | /* fat_ino_is_unique -- |
---|
802 | * Test whether ino is from unique ino pool |
---|
803 | * |
---|
804 | * PARAMETERS: |
---|
805 | * mt_entry - mount table entry |
---|
806 | * ino - ino to be tested |
---|
807 | * |
---|
808 | * RETURNS: |
---|
809 | * true if ino is allocated from unique ino pool, false otherwise |
---|
810 | */ |
---|
811 | inline bool |
---|
812 | fat_ino_is_unique( |
---|
813 | rtems_filesystem_mount_table_entry_t *mt_entry, |
---|
814 | uint32_t ino |
---|
815 | ) |
---|
816 | { |
---|
817 | fat_fs_info_t *fs_info = mt_entry->fs_info; |
---|
818 | |
---|
819 | return (ino >= fs_info->uino_base); |
---|
820 | } |
---|
821 | |
---|
822 | /* fat_fat32_update_fsinfo_sector -- |
---|
823 | * Synchronize fsinfo sector for FAT32 volumes |
---|
824 | * |
---|
825 | * PARAMETERS: |
---|
826 | * mt_entry - mount table entry |
---|
827 | * free_count - count of free clusters |
---|
828 | * next_free - the next free cluster num |
---|
829 | * |
---|
830 | * RETURNS: |
---|
831 | * RC_OK on success, or -1 if error occured (errno set appropriately) |
---|
832 | */ |
---|
833 | int |
---|
834 | fat_fat32_update_fsinfo_sector( |
---|
835 | rtems_filesystem_mount_table_entry_t *mt_entry, |
---|
836 | uint32_t free_count, |
---|
837 | uint32_t next_free |
---|
838 | ) |
---|
839 | { |
---|
840 | ssize_t ret1 = 0, ret2 = 0; |
---|
841 | register fat_fs_info_t *fs_info = mt_entry->fs_info; |
---|
842 | uint32_t le_free_count = 0; |
---|
843 | uint32_t le_next_free = 0; |
---|
844 | |
---|
845 | le_free_count = CT_LE_L(free_count); |
---|
846 | le_next_free = CT_LE_L(next_free); |
---|
847 | |
---|
848 | ret1 = _fat_block_write(mt_entry, |
---|
849 | fs_info->vol.info_sec, |
---|
850 | FAT_FSINFO_FREE_CLUSTER_COUNT_OFFSET, |
---|
851 | 4, |
---|
852 | (char *)(&le_free_count)); |
---|
853 | |
---|
854 | ret2 = _fat_block_write(mt_entry, |
---|
855 | fs_info->vol.info_sec, |
---|
856 | FAT_FSINFO_NEXT_FREE_CLUSTER_OFFSET, |
---|
857 | 4, |
---|
858 | (char *)(&le_next_free)); |
---|
859 | |
---|
860 | if ( (ret1 < 0) || (ret2 < 0) ) |
---|
861 | return -1; |
---|
862 | |
---|
863 | return RC_OK; |
---|
864 | } |
---|