1 | /** |
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2 | * @file |
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3 | * |
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4 | * @brief RTEMS RFS File Handlers |
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5 | * @ingroup rtems_rfs |
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6 | * |
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7 | * This file contains the set of handlers used to process operations on |
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8 | * RFS file nodes. |
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9 | */ |
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10 | |
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11 | /* |
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12 | * COPYRIGHT (c) 2010 Chris Johns <chrisj@rtems.org> |
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13 | * |
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14 | * The license and distribution terms for this file may be |
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15 | * found in the file LICENSE in this distribution or at |
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16 | * http://www.rtems.org/license/LICENSE. |
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17 | */ |
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18 | |
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19 | #if HAVE_CONFIG_H |
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20 | #include "config.h" |
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21 | #endif |
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22 | |
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23 | #include <inttypes.h> |
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24 | #include <string.h> |
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25 | |
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26 | #if SIZEOF_OFF_T == 8 |
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27 | #define PRIdoff_t PRId64 |
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28 | #elif SIZEOF_OFF_T == 4 |
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29 | #define PRIdoff_t PRId32 |
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30 | #else |
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31 | #error "unsupported size of off_t" |
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32 | #endif |
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33 | |
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34 | #include <rtems/rfs/rtems-rfs-file.h> |
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35 | #include "rtems-rfs-rtems.h" |
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36 | |
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37 | /** |
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38 | * This routine processes the open() system call. Note that there is nothing |
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39 | * special to be done at open() time. |
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40 | */ |
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41 | |
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42 | static int |
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43 | rtems_rfs_rtems_file_open (rtems_libio_t* iop, |
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44 | const char* pathname, |
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45 | int oflag, |
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46 | mode_t mode) |
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47 | { |
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48 | rtems_rfs_file_system* fs = rtems_rfs_rtems_pathloc_dev (&iop->pathinfo); |
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49 | rtems_rfs_ino ino; |
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50 | rtems_rfs_file_handle* file; |
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51 | int flags; |
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52 | int rc; |
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53 | |
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54 | flags = 0; |
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55 | |
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56 | if (rtems_rfs_rtems_trace (RTEMS_RFS_RTEMS_DEBUG_FILE_OPEN)) |
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57 | printf("rtems-rfs: file-open: path:%s ino:%" PRId32 " flags:%04i mode:%04" PRIu32 "\n", |
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58 | pathname, ino, flags, (uint32_t) mode); |
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59 | |
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60 | rtems_rfs_rtems_lock (fs); |
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61 | |
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62 | ino = rtems_rfs_rtems_get_iop_ino (iop); |
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63 | |
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64 | rc = rtems_rfs_file_open (fs, ino, flags, &file); |
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65 | if (rc > 0) |
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66 | { |
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67 | rtems_rfs_rtems_unlock (fs); |
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68 | return rtems_rfs_rtems_error ("file-open: open", rc); |
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69 | } |
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70 | |
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71 | if (rtems_rfs_rtems_trace (RTEMS_RFS_RTEMS_DEBUG_FILE_OPEN)) |
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72 | printf("rtems-rfs: file-open: handle:%p\n", file); |
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73 | |
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74 | rtems_rfs_rtems_set_iop_file_handle (iop, file); |
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75 | |
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76 | rtems_rfs_rtems_unlock (fs); |
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77 | return 0; |
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78 | } |
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79 | |
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80 | /** |
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81 | * This routine processes the close() system call. Note that there is nothing |
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82 | * to flush at this point. |
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83 | * |
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84 | * @param iop |
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85 | * @return int |
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86 | */ |
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87 | static int |
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88 | rtems_rfs_rtems_file_close (rtems_libio_t* iop) |
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89 | { |
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90 | rtems_rfs_file_handle* file = rtems_rfs_rtems_get_iop_file_handle (iop); |
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91 | rtems_rfs_file_system* fs = rtems_rfs_file_fs (file); |
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92 | int rc; |
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93 | |
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94 | if (rtems_rfs_rtems_trace (RTEMS_RFS_RTEMS_DEBUG_FILE_CLOSE)) |
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95 | printf("rtems-rfs: file-close: handle:%p\n", file); |
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96 | |
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97 | rtems_rfs_rtems_lock (fs); |
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98 | |
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99 | rc = rtems_rfs_file_close (fs, file); |
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100 | if (rc > 0) |
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101 | rc = rtems_rfs_rtems_error ("file-close: file close", rc); |
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102 | |
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103 | rtems_rfs_rtems_unlock (fs); |
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104 | return rc; |
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105 | } |
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106 | |
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107 | /** |
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108 | * This routine processes the read() system call. |
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109 | * |
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110 | * @param iop |
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111 | * @param buffer |
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112 | * @param count |
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113 | * @return int |
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114 | */ |
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115 | static ssize_t |
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116 | rtems_rfs_rtems_file_read (rtems_libio_t* iop, |
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117 | void* buffer, |
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118 | size_t count) |
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119 | { |
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120 | rtems_rfs_file_handle* file = rtems_rfs_rtems_get_iop_file_handle (iop); |
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121 | rtems_rfs_pos pos; |
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122 | uint8_t* data = buffer; |
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123 | ssize_t read = 0; |
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124 | int rc; |
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125 | |
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126 | if (rtems_rfs_rtems_trace (RTEMS_RFS_RTEMS_DEBUG_FILE_READ)) |
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127 | printf("rtems-rfs: file-read: handle:%p count:%zd\n", file, count); |
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128 | |
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129 | rtems_rfs_rtems_lock (rtems_rfs_file_fs (file)); |
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130 | |
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131 | pos = iop->offset; |
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132 | |
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133 | if (pos < rtems_rfs_file_size (file)) |
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134 | { |
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135 | while (count) |
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136 | { |
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137 | size_t size; |
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138 | |
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139 | rc = rtems_rfs_file_io_start (file, &size, true); |
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140 | if (rc > 0) |
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141 | { |
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142 | read = rtems_rfs_rtems_error ("file-read: read: io-start", rc); |
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143 | break; |
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144 | } |
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145 | |
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146 | if (size == 0) |
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147 | break; |
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148 | |
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149 | if (size > count) |
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150 | size = count; |
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151 | |
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152 | memcpy (data, rtems_rfs_file_data (file), size); |
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153 | |
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154 | data += size; |
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155 | count -= size; |
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156 | read += size; |
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157 | |
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158 | rc = rtems_rfs_file_io_end (file, size, true); |
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159 | if (rc > 0) |
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160 | { |
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161 | read = rtems_rfs_rtems_error ("file-read: read: io-end", rc); |
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162 | break; |
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163 | } |
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164 | } |
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165 | } |
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166 | |
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167 | if (read >= 0) |
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168 | iop->offset = pos + read; |
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169 | |
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170 | rtems_rfs_rtems_unlock (rtems_rfs_file_fs (file)); |
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171 | |
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172 | return read; |
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173 | } |
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174 | |
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175 | /** |
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176 | * This routine processes the write() system call. |
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177 | * |
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178 | * @param iop |
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179 | * @param buffer |
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180 | * @param count |
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181 | * @return ssize_t |
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182 | */ |
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183 | static ssize_t |
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184 | rtems_rfs_rtems_file_write (rtems_libio_t* iop, |
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185 | const void* buffer, |
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186 | size_t count) |
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187 | { |
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188 | rtems_rfs_file_handle* file = rtems_rfs_rtems_get_iop_file_handle (iop); |
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189 | rtems_rfs_pos pos; |
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190 | rtems_rfs_pos file_size; |
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191 | const uint8_t* data = buffer; |
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192 | ssize_t write = 0; |
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193 | int rc; |
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194 | |
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195 | if (rtems_rfs_rtems_trace (RTEMS_RFS_RTEMS_DEBUG_FILE_WRITE)) |
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196 | printf("rtems-rfs: file-write: handle:%p count:%zd\n", file, count); |
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197 | |
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198 | rtems_rfs_rtems_lock (rtems_rfs_file_fs (file)); |
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199 | |
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200 | pos = iop->offset; |
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201 | file_size = rtems_rfs_file_size (file); |
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202 | if (pos > file_size) |
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203 | { |
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204 | /* |
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205 | * If the iop position is past the physical end of the file we need to set |
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206 | * the file size to the new length before writing. The |
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207 | * rtems_rfs_file_io_end() will grow the file subsequently. |
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208 | */ |
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209 | rc = rtems_rfs_file_set_size (file, pos); |
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210 | if (rc) |
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211 | { |
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212 | rtems_rfs_rtems_unlock (rtems_rfs_file_fs (file)); |
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213 | return rtems_rfs_rtems_error ("file-write: write extend", rc); |
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214 | } |
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215 | |
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216 | rtems_rfs_file_set_bpos (file, pos); |
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217 | } |
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218 | else if (pos < file_size && (iop->flags & LIBIO_FLAGS_APPEND) != 0) |
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219 | { |
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220 | pos = file_size; |
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221 | rc = rtems_rfs_file_seek (file, pos, &pos); |
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222 | if (rc) |
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223 | { |
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224 | rtems_rfs_rtems_unlock (rtems_rfs_file_fs (file)); |
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225 | return rtems_rfs_rtems_error ("file-write: write append seek", rc); |
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226 | } |
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227 | } |
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228 | |
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229 | while (count) |
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230 | { |
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231 | size_t size = count; |
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232 | |
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233 | rc = rtems_rfs_file_io_start (file, &size, false); |
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234 | if (rc) |
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235 | { |
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236 | /* |
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237 | * If we have run out of space and have written some data return that |
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238 | * amount first as the inode will have accounted for it. This means |
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239 | * there was no error and the return code from can be ignored. |
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240 | */ |
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241 | if (!write) |
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242 | write = rtems_rfs_rtems_error ("file-write: write open", rc); |
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243 | break; |
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244 | } |
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245 | |
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246 | if (size > count) |
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247 | size = count; |
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248 | |
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249 | memcpy (rtems_rfs_file_data (file), data, size); |
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250 | |
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251 | data += size; |
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252 | count -= size; |
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253 | write += size; |
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254 | |
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255 | rc = rtems_rfs_file_io_end (file, size, false); |
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256 | if (rc) |
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257 | { |
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258 | write = rtems_rfs_rtems_error ("file-write: write close", rc); |
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259 | break; |
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260 | } |
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261 | } |
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262 | |
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263 | if (write >= 0) |
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264 | iop->offset = pos + write; |
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265 | |
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266 | rtems_rfs_rtems_unlock (rtems_rfs_file_fs (file)); |
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267 | |
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268 | return write; |
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269 | } |
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270 | |
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271 | /** |
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272 | * This routine processes the lseek() system call. |
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273 | * |
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274 | * @param iop |
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275 | * @param offset |
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276 | * @param whence |
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277 | * @return off_t |
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278 | */ |
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279 | static off_t |
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280 | rtems_rfs_rtems_file_lseek (rtems_libio_t* iop, |
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281 | off_t offset, |
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282 | int whence) |
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283 | { |
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284 | rtems_rfs_file_handle* file = rtems_rfs_rtems_get_iop_file_handle (iop); |
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285 | off_t old_offset; |
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286 | off_t new_offset; |
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287 | |
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288 | if (rtems_rfs_rtems_trace (RTEMS_RFS_RTEMS_DEBUG_FILE_LSEEK)) |
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289 | printf("rtems-rfs: file-lseek: handle:%p offset:%" PRIdoff_t "\n", file, offset); |
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290 | |
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291 | rtems_rfs_rtems_lock (rtems_rfs_file_fs (file)); |
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292 | |
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293 | old_offset = iop->offset; |
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294 | new_offset = rtems_filesystem_default_lseek_file (iop, offset, whence); |
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295 | if (new_offset != -1) |
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296 | { |
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297 | rtems_rfs_pos pos = iop->offset; |
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298 | int rc = rtems_rfs_file_seek (file, pos, &pos); |
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299 | |
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300 | if (rc) |
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301 | { |
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302 | rtems_rfs_rtems_error ("file_lseek: lseek", rc); |
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303 | iop->offset = old_offset; |
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304 | new_offset = -1; |
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305 | } |
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306 | } |
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307 | |
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308 | rtems_rfs_rtems_unlock (rtems_rfs_file_fs (file)); |
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309 | |
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310 | return new_offset; |
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311 | } |
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312 | |
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313 | /** |
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314 | * This routine processes the ftruncate() system call. |
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315 | * |
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316 | * @param iop |
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317 | * @param length |
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318 | * @return int |
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319 | */ |
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320 | static int |
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321 | rtems_rfs_rtems_file_ftruncate (rtems_libio_t* iop, |
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322 | off_t length) |
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323 | { |
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324 | rtems_rfs_file_handle* file = rtems_rfs_rtems_get_iop_file_handle (iop); |
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325 | int rc; |
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326 | |
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327 | if (rtems_rfs_rtems_trace (RTEMS_RFS_RTEMS_DEBUG_FILE_FTRUNC)) |
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328 | printf("rtems-rfs: file-ftrunc: handle:%p length:%" PRIdoff_t "\n", file, length); |
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329 | |
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330 | rtems_rfs_rtems_lock (rtems_rfs_file_fs (file)); |
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331 | |
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332 | rc = rtems_rfs_file_set_size (file, length); |
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333 | if (rc) |
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334 | rc = rtems_rfs_rtems_error ("file_ftruncate: set size", rc); |
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335 | |
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336 | rtems_rfs_rtems_unlock (rtems_rfs_file_fs (file)); |
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337 | |
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338 | return rc; |
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339 | } |
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340 | |
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341 | /* |
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342 | * Set of operations handlers for operations on RFS files. |
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343 | */ |
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344 | |
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345 | const rtems_filesystem_file_handlers_r rtems_rfs_rtems_file_handlers = { |
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346 | .open_h = rtems_rfs_rtems_file_open, |
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347 | .close_h = rtems_rfs_rtems_file_close, |
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348 | .read_h = rtems_rfs_rtems_file_read, |
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349 | .write_h = rtems_rfs_rtems_file_write, |
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350 | .ioctl_h = rtems_filesystem_default_ioctl, |
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351 | .lseek_h = rtems_rfs_rtems_file_lseek, |
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352 | .fstat_h = rtems_rfs_rtems_fstat, |
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353 | .ftruncate_h = rtems_rfs_rtems_file_ftruncate, |
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354 | .fsync_h = rtems_rfs_rtems_fdatasync, |
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355 | .fdatasync_h = rtems_rfs_rtems_fdatasync, |
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356 | .fcntl_h = rtems_filesystem_default_fcntl, |
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357 | .kqfilter_h = rtems_filesystem_default_kqfilter, |
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358 | .poll_h = rtems_filesystem_default_poll, |
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359 | .readv_h = rtems_filesystem_default_readv, |
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360 | .writev_h = rtems_filesystem_default_writev |
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361 | }; |
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