1 | /** |
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2 | * @file |
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3 | * |
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4 | * @brief MSDOS File Handlers Implementation |
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5 | * @ingroup libfs |
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6 | */ |
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7 | |
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8 | /* |
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9 | * Copyright (C) 2001 OKTET Ltd., St.-Petersburg, Russia |
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10 | * Author: Eugeny S. Mints <Eugeny.Mints@oktet.ru> |
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11 | * |
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12 | * The license and distribution terms for this file may be |
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13 | * found in the file LICENSE in this distribution or at |
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14 | * http://www.rtems.com/license/LICENSE. |
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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 <stdlib.h> |
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21 | #include <errno.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 <rtems/libio_.h> |
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26 | |
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27 | #include "fat.h" |
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28 | #include "fat_fat_operations.h" |
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29 | #include "fat_file.h" |
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30 | |
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31 | #include "msdos.h" |
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32 | |
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33 | static int |
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34 | msdos_file_update(rtems_libio_t *iop) |
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35 | { |
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36 | int rc = RC_OK; |
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37 | fat_file_fd_t *fat_fd = iop->pathinfo.node_access; |
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38 | |
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39 | /* |
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40 | * if fat-file descriptor is not marked as "removed", synchronize |
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41 | * size, first cluster number, write time and date fields of the file |
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42 | */ |
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43 | if (!FAT_FILE_IS_REMOVED(fat_fd)) |
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44 | { |
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45 | rc = msdos_set_first_cluster_num(iop->pathinfo.mt_entry, fat_fd); |
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46 | if (rc != RC_OK) |
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47 | { |
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48 | return rc; |
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49 | } |
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50 | |
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51 | rc = msdos_set_file_size(iop->pathinfo.mt_entry, fat_fd); |
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52 | if (rc != RC_OK) |
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53 | { |
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54 | return rc; |
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55 | } |
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56 | |
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57 | rc = msdos_set_dir_wrt_time_and_date(iop->pathinfo.mt_entry, fat_fd); |
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58 | if (rc != RC_OK) |
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59 | { |
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60 | return rc; |
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61 | } |
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62 | } |
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63 | |
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64 | return rc; |
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65 | } |
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66 | |
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67 | /* msdos_file_close -- |
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68 | * Close fat-file which correspondes to the file. If fat-file descriptor |
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69 | * which correspondes to the file is not marked "removed", synchronize |
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70 | * size, first cluster number, write time and date fields of the file. |
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71 | * |
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72 | * PARAMETERS: |
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73 | * iop - file control block |
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74 | * |
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75 | * RETURNS: |
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76 | * RC_OK, if file closed successfully, or -1 if error occured (errno set |
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77 | * appropriately) |
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78 | */ |
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79 | int |
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80 | msdos_file_close(rtems_libio_t *iop) |
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81 | { |
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82 | int rc = RC_OK; |
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83 | rtems_status_code sc = RTEMS_SUCCESSFUL; |
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84 | msdos_fs_info_t *fs_info = iop->pathinfo.mt_entry->fs_info; |
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85 | |
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86 | sc = rtems_semaphore_obtain(fs_info->vol_sema, RTEMS_WAIT, |
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87 | MSDOS_VOLUME_SEMAPHORE_TIMEOUT); |
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88 | if (sc != RTEMS_SUCCESSFUL) |
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89 | rtems_set_errno_and_return_minus_one(EIO); |
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90 | |
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91 | rc = msdos_file_update(iop); |
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92 | |
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93 | rtems_semaphore_release(fs_info->vol_sema); |
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94 | return rc; |
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95 | } |
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96 | |
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97 | /* msdos_file_read -- |
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98 | * This routine read from file pointed to by file control block into |
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99 | * the specified data buffer provided by user |
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100 | * |
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101 | * PARAMETERS: |
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102 | * iop - file control block |
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103 | * buffer - buffer provided by user |
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104 | * count - the number of bytes to read |
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105 | * |
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106 | * RETURNS: |
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107 | * the number of bytes read on success, or -1 if error occured (errno set |
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108 | * appropriately) |
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109 | */ |
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110 | ssize_t |
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111 | msdos_file_read(rtems_libio_t *iop, void *buffer, size_t count) |
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112 | { |
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113 | ssize_t ret = 0; |
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114 | rtems_status_code sc = RTEMS_SUCCESSFUL; |
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115 | msdos_fs_info_t *fs_info = iop->pathinfo.mt_entry->fs_info; |
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116 | fat_file_fd_t *fat_fd = iop->pathinfo.node_access; |
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117 | |
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118 | sc = rtems_semaphore_obtain(fs_info->vol_sema, RTEMS_WAIT, |
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119 | MSDOS_VOLUME_SEMAPHORE_TIMEOUT); |
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120 | if (sc != RTEMS_SUCCESSFUL) |
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121 | rtems_set_errno_and_return_minus_one(EIO); |
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122 | |
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123 | ret = fat_file_read(&fs_info->fat, fat_fd, iop->offset, count, |
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124 | buffer); |
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125 | if (ret > 0) |
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126 | iop->offset += ret; |
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127 | |
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128 | rtems_semaphore_release(fs_info->vol_sema); |
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129 | return ret; |
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130 | } |
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131 | |
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132 | /* msdos_file_write -- |
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133 | * This routine writes the specified data buffer into the file pointed to |
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134 | * by file control block. |
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135 | * |
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136 | * PARAMETERS: |
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137 | * iop - file control block |
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138 | * buffer - data to write |
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139 | * count - count of bytes to write |
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140 | * |
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141 | * RETURNS: |
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142 | * the number of bytes written on success, or -1 if error occured |
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143 | * and errno set appropriately |
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144 | */ |
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145 | ssize_t |
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146 | msdos_file_write(rtems_libio_t *iop,const void *buffer, size_t count) |
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147 | { |
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148 | ssize_t ret = 0; |
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149 | rtems_status_code sc = RTEMS_SUCCESSFUL; |
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150 | msdos_fs_info_t *fs_info = iop->pathinfo.mt_entry->fs_info; |
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151 | fat_file_fd_t *fat_fd = iop->pathinfo.node_access; |
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152 | |
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153 | sc = rtems_semaphore_obtain(fs_info->vol_sema, RTEMS_WAIT, |
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154 | MSDOS_VOLUME_SEMAPHORE_TIMEOUT); |
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155 | if (sc != RTEMS_SUCCESSFUL) |
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156 | rtems_set_errno_and_return_minus_one(EIO); |
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157 | |
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158 | if ((iop->flags & LIBIO_FLAGS_APPEND) != 0) |
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159 | iop->offset = fat_fd->fat_file_size; |
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160 | |
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161 | ret = fat_file_write(&fs_info->fat, fat_fd, iop->offset, count, |
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162 | buffer); |
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163 | if (ret < 0) |
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164 | { |
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165 | rtems_semaphore_release(fs_info->vol_sema); |
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166 | return -1; |
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167 | } |
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168 | |
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169 | /* |
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170 | * update file size in both fat-file descriptor and file control block if |
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171 | * file was extended |
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172 | */ |
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173 | iop->offset += ret; |
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174 | if (iop->offset > fat_fd->fat_file_size) |
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175 | fat_fd->fat_file_size = iop->offset; |
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176 | |
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177 | rtems_semaphore_release(fs_info->vol_sema); |
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178 | return ret; |
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179 | } |
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180 | |
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181 | /* msdos_file_stat -- |
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182 | * |
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183 | * PARAMETERS: |
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184 | * loc - node description |
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185 | * buf - stat buffer provided by user |
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186 | * |
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187 | * RETURNS: |
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188 | * RC_OK on success, or -1 if error occured (errno set appropriately) |
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189 | */ |
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190 | int |
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191 | msdos_file_stat( |
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192 | const rtems_filesystem_location_info_t *loc, |
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193 | struct stat *buf |
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194 | ) |
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195 | { |
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196 | rtems_status_code sc = RTEMS_SUCCESSFUL; |
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197 | msdos_fs_info_t *fs_info = loc->mt_entry->fs_info; |
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198 | fat_file_fd_t *fat_fd = loc->node_access; |
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199 | uint32_t cl_mask = fs_info->fat.vol.bpc - 1; |
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200 | |
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201 | sc = rtems_semaphore_obtain(fs_info->vol_sema, RTEMS_WAIT, |
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202 | MSDOS_VOLUME_SEMAPHORE_TIMEOUT); |
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203 | if (sc != RTEMS_SUCCESSFUL) |
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204 | rtems_set_errno_and_return_minus_one(EIO); |
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205 | |
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206 | buf->st_dev = rtems_disk_get_device_identifier(fs_info->fat.vol.dd); |
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207 | buf->st_ino = fat_fd->ino; |
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208 | buf->st_mode = S_IFREG | S_IRWXU | S_IRWXG | S_IRWXO; |
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209 | buf->st_rdev = 0ll; |
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210 | buf->st_size = fat_fd->fat_file_size; |
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211 | buf->st_blocks = ((fat_fd->fat_file_size + cl_mask) & ~cl_mask) |
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212 | >> FAT_SECTOR512_BITS; |
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213 | buf->st_blksize = fs_info->fat.vol.bpc; |
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214 | buf->st_mtime = fat_fd->mtime; |
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215 | |
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216 | rtems_semaphore_release(fs_info->vol_sema); |
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217 | return RC_OK; |
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218 | } |
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219 | |
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220 | /* msdos_file_ftruncate -- |
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221 | * Truncate the file. |
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222 | * |
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223 | * PARAMETERS: |
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224 | * iop - file control block |
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225 | * length - new length |
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226 | * |
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227 | * RETURNS: |
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228 | * RC_OK on success, or -1 if error occured (errno set appropriately). |
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229 | */ |
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230 | int |
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231 | msdos_file_ftruncate(rtems_libio_t *iop, off_t length) |
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232 | { |
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233 | int rc = RC_OK; |
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234 | rtems_status_code sc = RTEMS_SUCCESSFUL; |
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235 | msdos_fs_info_t *fs_info = iop->pathinfo.mt_entry->fs_info; |
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236 | fat_file_fd_t *fat_fd = iop->pathinfo.node_access; |
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237 | uint32_t old_length; |
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238 | |
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239 | sc = rtems_semaphore_obtain(fs_info->vol_sema, RTEMS_WAIT, |
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240 | MSDOS_VOLUME_SEMAPHORE_TIMEOUT); |
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241 | if (sc != RTEMS_SUCCESSFUL) |
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242 | rtems_set_errno_and_return_minus_one(EIO); |
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243 | |
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244 | old_length = fat_fd->fat_file_size; |
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245 | if (length < old_length) { |
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246 | rc = fat_file_truncate(&fs_info->fat, fat_fd, length); |
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247 | } else { |
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248 | uint32_t new_length; |
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249 | |
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250 | rc = fat_file_extend(&fs_info->fat, |
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251 | fat_fd, |
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252 | true, |
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253 | length, |
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254 | &new_length); |
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255 | if (rc == RC_OK && length != new_length) { |
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256 | fat_file_truncate(&fs_info->fat, fat_fd, old_length); |
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257 | errno = ENOSPC; |
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258 | rc = -1; |
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259 | } |
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260 | } |
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261 | |
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262 | if (rc == RC_OK) { |
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263 | fat_fd->fat_file_size = length; |
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264 | } |
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265 | |
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266 | rtems_semaphore_release(fs_info->vol_sema); |
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267 | |
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268 | return rc; |
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269 | } |
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270 | |
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271 | /* msdos_file_sync -- |
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272 | * Synchronize file - synchronize file data and if file is not removed |
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273 | * synchronize file metadata. |
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274 | * |
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275 | * PARAMETERS: |
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276 | * iop - file control block |
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277 | * |
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278 | * RETURNS: |
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279 | * RC_OK on success, or -1 if error occured (errno set appropriately) |
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280 | */ |
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281 | int |
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282 | msdos_file_sync(rtems_libio_t *iop) |
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283 | { |
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284 | int rc = RC_OK; |
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285 | rtems_status_code sc = RTEMS_SUCCESSFUL; |
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286 | msdos_fs_info_t *fs_info = iop->pathinfo.mt_entry->fs_info; |
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287 | |
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288 | sc = rtems_semaphore_obtain(fs_info->vol_sema, RTEMS_WAIT, |
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289 | MSDOS_VOLUME_SEMAPHORE_TIMEOUT); |
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290 | if (sc != RTEMS_SUCCESSFUL) |
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291 | rtems_set_errno_and_return_minus_one(EIO); |
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292 | |
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293 | rc = msdos_file_update(iop); |
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294 | if (rc != RC_OK) |
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295 | { |
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296 | rtems_semaphore_release(fs_info->vol_sema); |
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297 | return rc; |
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298 | } |
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299 | |
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300 | rc = fat_sync(&fs_info->fat); |
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301 | |
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302 | rtems_semaphore_release(fs_info->vol_sema); |
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303 | return RC_OK; |
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304 | } |
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