1 | /** |
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2 | * @file |
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3 | * |
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4 | * @ingroup rtems_blkdev |
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5 | * |
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6 | * Block device management. |
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7 | */ |
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8 | |
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9 | /* |
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10 | * Copyright (C) 2001 OKTET Ltd., St.-Petersburg, Russia |
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11 | * Author: Victor V. Vengerov <vvv@oktet.ru> |
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12 | * |
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13 | * @(#) $Id$ |
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14 | */ |
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15 | |
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16 | #if HAVE_CONFIG_H |
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17 | #include "config.h" |
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18 | #endif |
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19 | |
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20 | #include <errno.h> |
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21 | #include <string.h> |
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22 | |
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23 | #include <rtems.h> |
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24 | #include <rtems/libio.h> |
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25 | #include <sys/ioctl.h> |
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26 | |
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27 | #include "rtems/diskdevs.h" |
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28 | #include "rtems/bdbuf.h" |
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29 | |
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30 | /* rtems_blkdev_generic_read -- |
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31 | * Generic block device read primitive. Implemented using block device |
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32 | * buffer management primitives. |
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33 | */ |
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34 | rtems_device_driver |
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35 | rtems_blkdev_generic_read( |
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36 | rtems_device_major_number major, |
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37 | rtems_device_minor_number minor, |
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38 | void * arg) |
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39 | { |
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40 | rtems_status_code rc = RTEMS_SUCCESSFUL; |
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41 | rtems_libio_rw_args_t *args = arg; |
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42 | uint32_t block_size; |
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43 | char *buf; |
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44 | uint32_t count; |
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45 | rtems_blkdev_bnum block; |
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46 | uint32_t blkofs; |
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47 | dev_t dev; |
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48 | rtems_disk_device *dd; |
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49 | |
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50 | dev = rtems_filesystem_make_dev_t(major, minor); |
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51 | dd = rtems_disk_obtain(dev); |
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52 | if (dd == NULL) |
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53 | return RTEMS_INVALID_NUMBER; |
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54 | |
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55 | block_size = dd->block_size; |
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56 | |
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57 | buf = args->buffer; |
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58 | count = args->count; |
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59 | args->bytes_moved = 0; |
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60 | |
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61 | block = (rtems_blkdev_bnum) (args->offset / block_size); |
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62 | blkofs = (uint32_t) (args->offset % block_size); |
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63 | |
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64 | while (count > 0) |
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65 | { |
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66 | rtems_bdbuf_buffer *diskbuf; |
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67 | uint32_t copy; |
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68 | |
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69 | rc = rtems_bdbuf_read(dev, block, &diskbuf); |
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70 | if (rc != RTEMS_SUCCESSFUL) |
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71 | break; |
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72 | copy = block_size - blkofs; |
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73 | if (copy > count) |
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74 | copy = count; |
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75 | memcpy(buf, (char *)diskbuf->buffer + blkofs, copy); |
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76 | rc = rtems_bdbuf_release(diskbuf); |
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77 | args->bytes_moved += copy; |
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78 | if (rc != RTEMS_SUCCESSFUL) |
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79 | break; |
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80 | count -= copy; |
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81 | buf += copy; |
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82 | blkofs = 0; |
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83 | block++; |
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84 | } |
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85 | |
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86 | rtems_disk_release(dd); |
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87 | |
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88 | return rc; |
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89 | } |
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90 | |
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91 | /* rtems_blkdev_generic_write -- |
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92 | * Generic block device write primitive. Implemented using block device |
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93 | * buffer management primitives. |
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94 | */ |
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95 | rtems_device_driver |
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96 | rtems_blkdev_generic_write( |
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97 | rtems_device_major_number major, |
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98 | rtems_device_minor_number minor, |
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99 | void * arg) |
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100 | { |
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101 | rtems_status_code rc = RTEMS_SUCCESSFUL; |
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102 | rtems_libio_rw_args_t *args = arg; |
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103 | uint32_t block_size; |
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104 | char *buf; |
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105 | uint32_t count; |
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106 | rtems_blkdev_bnum block; |
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107 | uint32_t blkofs; |
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108 | dev_t dev; |
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109 | rtems_disk_device *dd; |
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110 | |
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111 | dev = rtems_filesystem_make_dev_t(major, minor); |
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112 | dd = rtems_disk_obtain(dev); |
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113 | if (dd == NULL) |
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114 | return RTEMS_INVALID_NUMBER; |
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115 | |
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116 | block_size = dd->block_size; |
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117 | |
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118 | buf = args->buffer; |
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119 | count = args->count; |
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120 | args->bytes_moved = 0; |
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121 | |
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122 | block = (rtems_blkdev_bnum) (args->offset / block_size); |
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123 | blkofs = (uint32_t) (args->offset % block_size); |
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124 | |
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125 | while (count > 0) |
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126 | { |
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127 | rtems_bdbuf_buffer *diskbuf; |
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128 | uint32_t copy; |
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129 | |
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130 | if ((blkofs == 0) && (count >= block_size)) |
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131 | rc = rtems_bdbuf_get(dev, block, &diskbuf); |
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132 | else |
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133 | rc = rtems_bdbuf_read(dev, block, &diskbuf); |
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134 | if (rc != RTEMS_SUCCESSFUL) |
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135 | break; |
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136 | |
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137 | copy = block_size - blkofs; |
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138 | if (copy > count) |
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139 | copy = count; |
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140 | memcpy((char *)diskbuf->buffer + blkofs, buf, copy); |
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141 | args->bytes_moved += copy; |
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142 | |
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143 | rc = rtems_bdbuf_release_modified(diskbuf); |
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144 | if (rc != RTEMS_SUCCESSFUL) |
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145 | break; |
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146 | |
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147 | count -= copy; |
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148 | buf += copy; |
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149 | blkofs = 0; |
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150 | block++; |
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151 | } |
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152 | |
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153 | rtems_disk_release(dd); |
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154 | |
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155 | return rc; |
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156 | } |
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157 | |
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158 | /* blkdev_generic_open -- |
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159 | * Generic block device open primitive. |
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160 | */ |
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161 | rtems_device_driver |
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162 | rtems_blkdev_generic_open( |
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163 | rtems_device_major_number major, |
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164 | rtems_device_minor_number minor, |
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165 | void * arg __attribute__((unused))) |
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166 | { |
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167 | dev_t dev; |
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168 | rtems_disk_device *dd; |
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169 | |
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170 | dev = rtems_filesystem_make_dev_t(major, minor); |
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171 | dd = rtems_disk_obtain(dev); |
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172 | if (dd == NULL) |
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173 | return RTEMS_INVALID_NUMBER; |
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174 | |
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175 | dd->uses++; |
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176 | |
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177 | rtems_disk_release(dd); |
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178 | |
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179 | return RTEMS_SUCCESSFUL; |
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180 | } |
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181 | |
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182 | |
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183 | /* blkdev_generic_close -- |
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184 | * Generic block device close primitive. |
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185 | */ |
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186 | rtems_device_driver |
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187 | rtems_blkdev_generic_close( |
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188 | rtems_device_major_number major, |
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189 | rtems_device_minor_number minor, |
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190 | void * arg __attribute__((unused))) |
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191 | { |
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192 | dev_t dev; |
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193 | rtems_disk_device *dd; |
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194 | |
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195 | dev = rtems_filesystem_make_dev_t(major, minor); |
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196 | dd = rtems_disk_obtain(dev); |
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197 | if (dd == NULL) |
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198 | return RTEMS_INVALID_NUMBER; |
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199 | |
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200 | dd->uses--; |
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201 | |
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202 | rtems_disk_release(dd); |
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203 | |
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204 | return RTEMS_SUCCESSFUL; |
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205 | } |
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206 | |
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207 | /* blkdev_generic_ioctl -- |
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208 | * Generic block device ioctl primitive. |
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209 | */ |
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210 | rtems_device_driver |
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211 | rtems_blkdev_generic_ioctl( |
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212 | rtems_device_major_number major, |
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213 | rtems_device_minor_number minor, |
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214 | void * arg) |
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215 | { |
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216 | rtems_libio_ioctl_args_t *args = arg; |
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217 | dev_t dev; |
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218 | rtems_disk_device *dd; |
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219 | int rc; |
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220 | |
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221 | dev = rtems_filesystem_make_dev_t(major, minor); |
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222 | dd = rtems_disk_obtain(dev); |
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223 | if (dd == NULL) |
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224 | return RTEMS_INVALID_NUMBER; |
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225 | |
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226 | switch (args->command) |
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227 | { |
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228 | case RTEMS_BLKIO_GETMEDIABLKSIZE: |
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229 | *((uint32_t *) args->buffer) = dd->media_block_size; |
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230 | args->ioctl_return = 0; |
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231 | break; |
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232 | |
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233 | case RTEMS_BLKIO_GETBLKSIZE: |
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234 | *((uint32_t *) args->buffer) = dd->block_size; |
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235 | args->ioctl_return = 0; |
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236 | break; |
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237 | |
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238 | case RTEMS_BLKIO_SETBLKSIZE: |
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239 | dd->block_size = *((uint32_t *) args->buffer); |
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240 | args->ioctl_return = 0; |
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241 | break; |
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242 | |
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243 | case RTEMS_BLKIO_GETSIZE: |
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244 | *((rtems_blkdev_bnum *) args->buffer) = dd->size; |
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245 | args->ioctl_return = 0; |
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246 | break; |
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247 | |
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248 | case RTEMS_BLKIO_SYNCDEV: |
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249 | rc = rtems_bdbuf_syncdev(dd->dev); |
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250 | args->ioctl_return = (uint32_t) (rc == RTEMS_SUCCESSFUL ? 0 : -1); |
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251 | break; |
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252 | |
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253 | case RTEMS_BLKIO_REQUEST: |
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254 | { |
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255 | rtems_blkdev_request *req = args->buffer; |
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256 | args->ioctl_return = (uint32_t) dd->ioctl(dd, args->command, req); |
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257 | break; |
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258 | } |
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259 | |
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260 | default: |
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261 | args->ioctl_return = (uint32_t) dd->ioctl(dd, args->command, |
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262 | args->buffer); |
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263 | break; |
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264 | } |
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265 | rtems_disk_release(dd); |
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266 | |
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267 | return RTEMS_SUCCESSFUL; |
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268 | } |
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269 | |
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270 | int |
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271 | rtems_blkdev_ioctl(rtems_disk_device *dd, uint32_t req, void *argp) |
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272 | { |
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273 | size_t *arg_size = argp; |
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274 | int rc = 0; |
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275 | |
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276 | switch (req) |
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277 | { |
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278 | case RTEMS_BLKIO_GETMEDIABLKSIZE: |
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279 | *arg_size = dd->media_block_size; |
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280 | break; |
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281 | |
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282 | case RTEMS_BLKIO_GETBLKSIZE: |
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283 | *arg_size = dd->block_size; |
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284 | break; |
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285 | |
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286 | case RTEMS_BLKIO_SETBLKSIZE: |
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287 | dd->block_size = *arg_size; |
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288 | break; |
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289 | |
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290 | case RTEMS_BLKIO_GETSIZE: |
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291 | *arg_size = dd->size; |
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292 | break; |
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293 | |
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294 | default: |
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295 | errno = EINVAL; |
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296 | rc = -1; |
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297 | break; |
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298 | } |
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299 | |
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300 | return rc; |
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301 | } |
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