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.org/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 | /* msdos_file_read -- |
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34 | * This routine read from file pointed to by file control block into |
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35 | * the specified data buffer provided by user |
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36 | * |
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37 | * PARAMETERS: |
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38 | * iop - file control block |
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39 | * buffer - buffer provided by user |
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40 | * count - the number of bytes to read |
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41 | * |
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42 | * RETURNS: |
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43 | * the number of bytes read on success, or -1 if error occured (errno set |
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44 | * appropriately) |
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45 | */ |
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46 | ssize_t |
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47 | msdos_file_read(rtems_libio_t *iop, void *buffer, size_t count) |
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48 | { |
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49 | ssize_t ret = 0; |
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50 | msdos_fs_info_t *fs_info = iop->pathinfo.mt_entry->fs_info; |
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51 | fat_file_fd_t *fat_fd = iop->pathinfo.node_access; |
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52 | |
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53 | msdos_fs_lock(fs_info); |
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54 | |
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55 | ret = fat_file_read(&fs_info->fat, fat_fd, iop->offset, count, |
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56 | buffer); |
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57 | if (ret > 0) |
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58 | iop->offset += ret; |
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59 | |
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60 | msdos_fs_unlock(fs_info); |
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61 | return ret; |
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62 | } |
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63 | |
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64 | /* msdos_file_write -- |
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65 | * This routine writes the specified data buffer into the file pointed to |
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66 | * by file control block. |
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67 | * |
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68 | * PARAMETERS: |
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69 | * iop - file control block |
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70 | * buffer - data to write |
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71 | * count - count of bytes to write |
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72 | * |
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73 | * RETURNS: |
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74 | * the number of bytes written on success, or -1 if error occured |
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75 | * and errno set appropriately |
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76 | */ |
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77 | ssize_t |
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78 | msdos_file_write(rtems_libio_t *iop,const void *buffer, size_t count) |
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79 | { |
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80 | ssize_t ret = 0; |
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81 | msdos_fs_info_t *fs_info = iop->pathinfo.mt_entry->fs_info; |
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82 | fat_file_fd_t *fat_fd = iop->pathinfo.node_access; |
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83 | |
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84 | msdos_fs_lock(fs_info); |
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85 | |
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86 | if (rtems_libio_iop_is_append(iop)) |
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87 | iop->offset = fat_fd->fat_file_size; |
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88 | |
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89 | ret = fat_file_write(&fs_info->fat, fat_fd, iop->offset, count, |
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90 | buffer); |
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91 | if (ret < 0) |
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92 | { |
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93 | msdos_fs_unlock(fs_info); |
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94 | return -1; |
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95 | } |
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96 | |
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97 | /* |
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98 | * update file size in both fat-file descriptor and file control block if |
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99 | * file was extended |
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100 | */ |
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101 | iop->offset += ret; |
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102 | if (iop->offset > fat_fd->fat_file_size) |
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103 | fat_file_set_file_size(fat_fd, (uint32_t) iop->offset); |
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104 | |
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105 | if (ret > 0) |
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106 | fat_file_set_ctime_mtime(fat_fd, time(NULL)); |
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107 | |
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108 | msdos_fs_unlock(fs_info); |
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109 | return ret; |
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110 | } |
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111 | |
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112 | /* msdos_file_stat -- |
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113 | * |
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114 | * PARAMETERS: |
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115 | * loc - node description |
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116 | * buf - stat buffer provided by user |
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117 | * |
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118 | * RETURNS: |
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119 | * RC_OK on success, or -1 if error occured (errno set appropriately) |
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120 | */ |
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121 | int |
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122 | msdos_file_stat( |
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123 | const rtems_filesystem_location_info_t *loc, |
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124 | struct stat *buf |
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125 | ) |
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126 | { |
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127 | msdos_fs_info_t *fs_info = loc->mt_entry->fs_info; |
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128 | fat_file_fd_t *fat_fd = loc->node_access; |
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129 | uint32_t cl_mask = fs_info->fat.vol.bpc - 1; |
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130 | |
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131 | msdos_fs_lock(fs_info); |
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132 | |
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133 | buf->st_dev = rtems_disk_get_device_identifier(fs_info->fat.vol.dd); |
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134 | buf->st_ino = fat_fd->ino; |
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135 | buf->st_mode = S_IFREG | S_IRWXU | S_IRWXG | S_IRWXO; |
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136 | buf->st_rdev = 0ll; |
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137 | buf->st_size = fat_fd->fat_file_size; |
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138 | buf->st_blocks = ((fat_fd->fat_file_size + cl_mask) & ~cl_mask) |
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139 | >> FAT_SECTOR512_BITS; |
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140 | buf->st_blksize = fs_info->fat.vol.bpc; |
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141 | buf->st_atime = fat_fd->mtime; |
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142 | buf->st_ctime = fat_fd->ctime; |
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143 | buf->st_mtime = fat_fd->mtime; |
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144 | |
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145 | msdos_fs_unlock(fs_info); |
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146 | return RC_OK; |
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147 | } |
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148 | |
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149 | /* msdos_file_ftruncate -- |
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150 | * Truncate the file. |
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151 | * |
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152 | * PARAMETERS: |
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153 | * iop - file control block |
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154 | * length - new length |
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155 | * |
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156 | * RETURNS: |
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157 | * RC_OK on success, or -1 if error occured (errno set appropriately). |
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158 | */ |
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159 | int |
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160 | msdos_file_ftruncate(rtems_libio_t *iop, off_t length) |
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161 | { |
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162 | int rc = RC_OK; |
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163 | msdos_fs_info_t *fs_info = iop->pathinfo.mt_entry->fs_info; |
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164 | fat_file_fd_t *fat_fd = iop->pathinfo.node_access; |
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165 | uint32_t old_length; |
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166 | |
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167 | msdos_fs_lock(fs_info); |
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168 | |
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169 | old_length = fat_fd->fat_file_size; |
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170 | if (length < old_length) { |
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171 | rc = fat_file_truncate(&fs_info->fat, fat_fd, length); |
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172 | } else { |
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173 | uint32_t new_length; |
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174 | |
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175 | rc = fat_file_extend(&fs_info->fat, |
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176 | fat_fd, |
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177 | true, |
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178 | length, |
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179 | &new_length); |
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180 | if (rc == RC_OK && length != new_length) { |
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181 | fat_file_truncate(&fs_info->fat, fat_fd, old_length); |
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182 | errno = ENOSPC; |
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183 | rc = -1; |
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184 | } |
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185 | } |
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186 | |
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187 | if (rc == RC_OK) |
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188 | { |
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189 | fat_file_set_file_size(fat_fd, length); |
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190 | fat_file_set_ctime_mtime(fat_fd, time(NULL)); |
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191 | } |
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192 | |
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193 | msdos_fs_unlock(fs_info); |
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194 | |
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195 | return rc; |
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196 | } |
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197 | |
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198 | /* msdos_file_sync -- |
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199 | * Synchronize file - synchronize file data and if file is not removed |
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200 | * synchronize file metadata. |
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201 | * |
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202 | * PARAMETERS: |
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203 | * iop - file control block |
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204 | * |
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205 | * RETURNS: |
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206 | * RC_OK on success, or -1 if error occured (errno set appropriately) |
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207 | */ |
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208 | int |
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209 | msdos_file_sync(rtems_libio_t *iop) |
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210 | { |
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211 | int rc = RC_OK; |
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212 | msdos_fs_info_t *fs_info = iop->pathinfo.mt_entry->fs_info; |
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213 | fat_file_fd_t *fat_fd = iop->pathinfo.node_access; |
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214 | |
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215 | msdos_fs_lock(fs_info); |
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216 | |
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217 | rc = fat_file_update(&fs_info->fat, fat_fd); |
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218 | if (rc != RC_OK) |
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219 | { |
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220 | msdos_fs_unlock(fs_info); |
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221 | return rc; |
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222 | } |
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223 | |
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224 | rc = fat_sync(&fs_info->fat); |
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225 | |
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226 | msdos_fs_unlock(fs_info); |
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227 | |
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228 | return RC_OK; |
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229 | } |
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