1 | /** |
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2 | * @file |
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3 | * |
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4 | * @brief MSDOS Filesystem Initialization |
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5 | * @ingroup libfs_msdos MSDOS FileSystem |
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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 | |
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17 | #if HAVE_CONFIG_H |
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18 | #include "config.h" |
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19 | #endif |
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20 | |
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21 | #include <sys/types.h> |
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22 | #include <fcntl.h> |
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23 | #include <unistd.h> |
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24 | #include <stdlib.h> |
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25 | #include <stdio.h> |
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26 | |
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27 | #include <rtems.h> |
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28 | #include <rtems/libio_.h> |
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29 | |
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30 | #include "fat.h" |
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31 | #include "fat_fat_operations.h" |
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32 | #include "fat_file.h" |
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33 | |
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34 | #include "msdos.h" |
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35 | |
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36 | /* msdos_initialize_support -- |
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37 | * MSDOS filesystem initialization |
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38 | * |
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39 | * PARAMETERS: |
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40 | * temp_mt_entry - mount table entry |
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41 | * op_table - filesystem operations table |
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42 | * file_handlers - file operations table |
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43 | * directory_handlers - directory operations table |
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44 | * |
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45 | * RETURNS: |
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46 | * RC_OK and filled temp_mt_entry on success, or -1 if error occured |
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47 | * (errno set apropriately) |
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48 | * |
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49 | */ |
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50 | int |
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51 | msdos_initialize_support( |
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52 | rtems_filesystem_mount_table_entry_t *temp_mt_entry, |
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53 | const rtems_filesystem_operations_table *op_table, |
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54 | const rtems_filesystem_file_handlers_r *file_handlers, |
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55 | const rtems_filesystem_file_handlers_r *directory_handlers, |
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56 | rtems_dosfs_convert_control *converter |
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57 | ) |
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58 | { |
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59 | int rc = RC_OK; |
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60 | rtems_status_code sc = RTEMS_SUCCESSFUL; |
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61 | msdos_fs_info_t *fs_info = NULL; |
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62 | fat_file_fd_t *fat_fd = NULL; |
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63 | fat_dir_pos_t root_pos; |
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64 | uint32_t cl_buf_size; |
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65 | |
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66 | fs_info = (msdos_fs_info_t *)calloc(1, sizeof(msdos_fs_info_t)); |
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67 | if (!fs_info) |
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68 | rtems_set_errno_and_return_minus_one(ENOMEM); |
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69 | |
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70 | temp_mt_entry->fs_info = fs_info; |
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71 | |
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72 | fs_info->converter = converter; |
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73 | |
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74 | rc = fat_init_volume_info(&fs_info->fat, temp_mt_entry->dev); |
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75 | if (rc != RC_OK) |
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76 | { |
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77 | free(fs_info); |
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78 | return rc; |
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79 | } |
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80 | |
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81 | fs_info->file_handlers = file_handlers; |
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82 | fs_info->directory_handlers = directory_handlers; |
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83 | |
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84 | /* |
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85 | * open fat-file which correspondes to root directory |
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86 | * (so inode number 0x00000010 is always used for root directory) |
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87 | */ |
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88 | fat_dir_pos_init(&root_pos); |
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89 | root_pos.sname.cln = FAT_ROOTDIR_CLUSTER_NUM; |
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90 | rc = fat_file_open(&fs_info->fat, &root_pos, &fat_fd); |
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91 | if (rc != RC_OK) |
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92 | { |
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93 | fat_shutdown_drive(&fs_info->fat); |
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94 | free(fs_info); |
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95 | return rc; |
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96 | } |
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97 | |
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98 | /* again: unfortunately "fat-file" is just almost fat file :( */ |
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99 | fat_fd->fat_file_type = FAT_DIRECTORY; |
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100 | fat_fd->size_limit = MSDOS_MAX_DIR_LENGHT; |
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101 | fat_fd->cln = fs_info->fat.vol.rdir_cl; |
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102 | |
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103 | fat_fd->map.file_cln = 0; |
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104 | fat_fd->map.disk_cln = fat_fd->cln; |
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105 | |
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106 | /* if we have FAT12/16 */ |
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107 | if ( fat_fd->cln == 0 ) |
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108 | { |
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109 | fat_fd->fat_file_size = fs_info->fat.vol.rdir_size; |
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110 | cl_buf_size = (fs_info->fat.vol.bpc > fs_info->fat.vol.rdir_size) ? |
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111 | fs_info->fat.vol.bpc : |
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112 | fs_info->fat.vol.rdir_size; |
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113 | } |
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114 | else |
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115 | { |
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116 | rc = fat_file_size(&fs_info->fat, fat_fd); |
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117 | if ( rc != RC_OK ) |
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118 | { |
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119 | fat_file_close(&fs_info->fat, fat_fd); |
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120 | fat_shutdown_drive(&fs_info->fat); |
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121 | free(fs_info); |
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122 | return rc; |
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123 | } |
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124 | cl_buf_size = fs_info->fat.vol.bpc; |
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125 | } |
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126 | |
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127 | fs_info->cl_buf = (uint8_t *)calloc(cl_buf_size, sizeof(char)); |
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128 | if (fs_info->cl_buf == NULL) |
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129 | { |
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130 | fat_file_close(&fs_info->fat, fat_fd); |
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131 | fat_shutdown_drive(&fs_info->fat); |
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132 | free(fs_info); |
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133 | rtems_set_errno_and_return_minus_one(ENOMEM); |
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134 | } |
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135 | |
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136 | sc = rtems_semaphore_create(3, |
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137 | 1, |
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138 | RTEMS_BINARY_SEMAPHORE | RTEMS_FIFO, |
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139 | 0, |
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140 | &fs_info->vol_sema); |
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141 | if (sc != RTEMS_SUCCESSFUL) |
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142 | { |
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143 | fat_file_close(&fs_info->fat, fat_fd); |
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144 | fat_shutdown_drive(&fs_info->fat); |
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145 | free(fs_info->cl_buf); |
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146 | free(fs_info); |
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147 | rtems_set_errno_and_return_minus_one( EIO ); |
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148 | } |
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149 | |
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150 | temp_mt_entry->mt_fs_root->location.node_access = fat_fd; |
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151 | temp_mt_entry->mt_fs_root->location.handlers = directory_handlers; |
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152 | temp_mt_entry->ops = op_table; |
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153 | |
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154 | return rc; |
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155 | } |
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