1 | /* |
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2 | * blkdev.h - block device driver generic support |
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3 | * |
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4 | * Copyright (C) 2001 OKTET Ltd., St.-Petersburg, Russia |
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5 | * Author: Victor V. Vengerov <vvv@oktet.ru> |
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6 | * |
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7 | * @(#) $Id$ |
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8 | */ |
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9 | |
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10 | #include <string.h> |
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11 | |
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12 | #include <rtems.h> |
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13 | #include <rtems/libio.h> |
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14 | #include <sys/ioctl.h> |
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15 | |
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16 | #include "rtems/diskdevs.h" |
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17 | #include "rtems/bdbuf.h" |
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18 | |
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19 | /* rtems_blkdev_generic_read -- |
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20 | * Generic block device read primitive. Implemented using block device |
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21 | * buffer management primitives. |
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22 | */ |
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23 | rtems_device_driver |
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24 | rtems_blkdev_generic_read( |
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25 | rtems_device_major_number major, |
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26 | rtems_device_minor_number minor, |
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27 | void * arg) |
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28 | { |
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29 | rtems_libio_rw_args_t *args = arg; |
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30 | int block_size_log2; |
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31 | int block_size; |
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32 | char *buf; |
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33 | unsigned int count; |
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34 | unsigned int block; |
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35 | unsigned int blkofs; |
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36 | dev_t dev; |
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37 | disk_device *dd; |
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38 | |
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39 | dev = rtems_filesystem_make_dev_t(major, minor); |
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40 | dd = rtems_disk_lookup(dev); |
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41 | if (dd == NULL) |
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42 | return RTEMS_INVALID_NUMBER; |
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43 | |
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44 | block_size_log2 = dd->block_size_log2; |
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45 | block_size = dd->block_size; |
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46 | |
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47 | buf = args->buffer; |
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48 | count = args->count; |
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49 | args->bytes_moved = 0; |
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50 | |
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51 | block = args->offset >> block_size_log2; |
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52 | blkofs = args->offset & (block_size - 1); |
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53 | |
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54 | while (count > 0) |
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55 | { |
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56 | bdbuf_buffer *diskbuf; |
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57 | int copy; |
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58 | rtems_status_code rc; |
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59 | |
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60 | rc = rtems_bdbuf_read(dev, block, &diskbuf); |
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61 | if (rc != RTEMS_SUCCESSFUL) |
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62 | return rc; |
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63 | copy = block_size - blkofs; |
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64 | if (copy > count) |
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65 | copy = count; |
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66 | memcpy(buf, (char *)diskbuf->buffer + blkofs, copy); |
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67 | rc = rtems_bdbuf_release(diskbuf); |
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68 | args->bytes_moved += copy; |
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69 | if (rc != RTEMS_SUCCESSFUL) |
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70 | return rc; |
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71 | count -= copy; |
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72 | buf += copy; |
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73 | blkofs = 0; |
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74 | block++; |
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75 | } |
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76 | return RTEMS_SUCCESSFUL; |
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77 | } |
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78 | |
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79 | /* rtems_blkdev_generic_write -- |
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80 | * Generic block device write primitive. Implemented using block device |
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81 | * buffer management primitives. |
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82 | */ |
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83 | rtems_device_driver |
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84 | rtems_blkdev_generic_write( |
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85 | rtems_device_major_number major, |
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86 | rtems_device_minor_number minor, |
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87 | void * arg) |
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88 | { |
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89 | rtems_libio_rw_args_t *args = arg; |
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90 | int block_size_log2; |
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91 | int block_size; |
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92 | char *buf; |
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93 | unsigned int count; |
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94 | unsigned int block; |
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95 | unsigned int blkofs; |
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96 | dev_t dev; |
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97 | rtems_status_code rc; |
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98 | disk_device *dd; |
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99 | |
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100 | dev = rtems_filesystem_make_dev_t(major, minor); |
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101 | dd = rtems_disk_lookup(dev); |
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102 | if (dd == NULL) |
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103 | return RTEMS_INVALID_NUMBER; |
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104 | |
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105 | block_size_log2 = dd->block_size_log2; |
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106 | block_size = dd->block_size; |
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107 | |
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108 | buf = args->buffer; |
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109 | count = args->count; |
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110 | args->bytes_moved = 0; |
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111 | |
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112 | block = args->offset >> block_size_log2; |
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113 | blkofs = args->offset & (block_size - 1); |
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114 | |
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115 | while (count > 0) |
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116 | { |
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117 | bdbuf_buffer *diskbuf; |
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118 | int copy; |
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119 | |
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120 | if ((blkofs == 0) && (count > block_size)) |
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121 | rc = rtems_bdbuf_get(dev, block, &diskbuf); |
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122 | else |
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123 | rc = rtems_bdbuf_read(dev, block, &diskbuf); |
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124 | if (rc != RTEMS_SUCCESSFUL) |
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125 | return rc; |
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126 | |
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127 | copy = block_size - blkofs; |
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128 | if (copy > count) |
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129 | copy = count; |
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130 | memcpy((char *)diskbuf->buffer + blkofs, buf, copy); |
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131 | args->bytes_moved += copy; |
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132 | |
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133 | rc = rtems_bdbuf_release_modified(diskbuf); |
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134 | if (rc != RTEMS_SUCCESSFUL) |
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135 | return rc; |
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136 | |
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137 | count -= copy; |
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138 | buf += copy; |
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139 | blkofs = 0; |
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140 | block++; |
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141 | } |
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142 | return RTEMS_SUCCESSFUL; |
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143 | } |
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144 | |
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145 | /* blkdev_generic_open -- |
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146 | * Generic block device open primitive. |
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147 | */ |
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148 | rtems_device_driver |
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149 | rtems_blkdev_generic_open( |
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150 | rtems_device_major_number major, |
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151 | rtems_device_minor_number minor, |
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152 | void * arg) |
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153 | { |
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154 | dev_t dev; |
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155 | disk_device *dd; |
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156 | |
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157 | dev = rtems_filesystem_make_dev_t(major, minor); |
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158 | dd = rtems_disk_lookup(dev); |
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159 | if (dd == NULL) |
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160 | return RTEMS_INVALID_NUMBER; |
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161 | |
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162 | dd->uses++; |
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163 | |
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164 | rtems_disk_release(dd); |
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165 | |
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166 | return RTEMS_SUCCESSFUL; |
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167 | } |
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168 | |
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169 | |
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170 | /* blkdev_generic_close -- |
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171 | * Generic block device close primitive. |
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172 | */ |
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173 | rtems_device_driver |
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174 | rtems_blkdev_generic_close( |
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175 | rtems_device_major_number major, |
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176 | rtems_device_minor_number minor, |
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177 | void * arg) |
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178 | { |
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179 | dev_t dev; |
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180 | disk_device *dd; |
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181 | |
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182 | dev = rtems_filesystem_make_dev_t(major, minor); |
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183 | dd = rtems_disk_lookup(dev); |
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184 | if (dd == NULL) |
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185 | return RTEMS_INVALID_NUMBER; |
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186 | |
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187 | dd->uses--; |
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188 | |
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189 | rtems_disk_release(dd); |
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190 | |
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191 | return RTEMS_SUCCESSFUL; |
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192 | } |
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193 | |
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194 | /* blkdev_generic_ioctl -- |
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195 | * Generic block device ioctl primitive. |
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196 | */ |
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197 | rtems_device_driver |
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198 | rtems_blkdev_generic_ioctl( |
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199 | rtems_device_major_number major, |
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200 | rtems_device_minor_number minor, |
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201 | void * arg) |
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202 | { |
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203 | rtems_libio_ioctl_args_t *args = arg; |
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204 | dev_t dev; |
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205 | disk_device *dd; |
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206 | int rc; |
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207 | |
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208 | dev = rtems_filesystem_make_dev_t(major, minor); |
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209 | dd = rtems_disk_lookup(dev); |
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210 | if (dd == NULL) |
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211 | return RTEMS_INVALID_NUMBER; |
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212 | |
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213 | switch (args->command) |
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214 | { |
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215 | case BLKIO_GETBLKSIZE: |
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216 | args->ioctl_return = dd->block_size; |
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217 | break; |
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218 | |
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219 | case BLKIO_GETSIZE: |
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220 | args->ioctl_return = dd->size; |
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221 | break; |
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222 | |
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223 | case BLKIO_SYNCDEV: |
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224 | rc = rtems_bdbuf_syncdev(dd->dev); |
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225 | args->ioctl_return = (rc == RTEMS_SUCCESSFUL ? 0 : -1); |
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226 | break; |
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227 | |
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228 | case BLKIO_REQUEST: |
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229 | { |
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230 | blkdev_request *req = args->buffer; |
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231 | req->start += dd->start; |
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232 | args->ioctl_return = dd->ioctl(dd->phys_dev->dev, args->command, |
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233 | req); |
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234 | break; |
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235 | } |
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236 | |
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237 | default: |
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238 | args->ioctl_return = dd->ioctl(dd->phys_dev->dev, args->command, |
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239 | args->buffer); |
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240 | break; |
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241 | } |
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242 | rtems_disk_release(dd); |
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243 | |
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244 | return RTEMS_SUCCESSFUL; |
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245 | } |
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