1 | /* |
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2 | * Header file for the In-Memory File System |
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3 | * |
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4 | * COPYRIGHT (c) 1989-1999. |
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5 | * On-Line Applications Research Corporation (OAR). |
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6 | * |
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7 | * The license and distribution terms for this file may be |
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8 | * found in the file LICENSE in this distribution or at |
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9 | * http://www.OARcorp.com/rtems/license.html. |
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10 | * |
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11 | * $Id$ |
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12 | */ |
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13 | |
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14 | #ifndef __IMFS_h |
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15 | #define __IMFS_h |
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16 | |
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17 | #ifdef __cplusplus |
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18 | extern "C" { |
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19 | #endif |
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20 | |
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21 | #include <rtems.h> |
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22 | #include <chain.h> |
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23 | |
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24 | #include <sys/types.h> |
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25 | #include <limits.h> |
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26 | #include <rtems/libio.h> |
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27 | |
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28 | /* |
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29 | * File name macros |
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30 | */ |
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31 | |
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32 | #define IMFS_is_valid_name_char( _ch ) ( 1 ) |
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33 | |
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34 | #define IMFS_is_separator( _ch ) \ |
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35 | rtems_filesystem_is_separator( _ch ) |
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36 | |
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37 | /* |
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38 | * Data types |
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39 | */ |
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40 | |
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41 | struct IMFS_jnode_tt; |
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42 | typedef struct IMFS_jnode_tt IMFS_jnode_t; |
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43 | |
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44 | typedef struct { |
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45 | Chain_Control Entries; |
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46 | rtems_filesystem_mount_table_entry_t *mt_fs; |
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47 | } IMFS_directory_t; |
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48 | |
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49 | typedef struct { |
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50 | rtems_device_major_number major; |
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51 | rtems_device_minor_number minor; |
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52 | } IMFS_device_t; |
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53 | |
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54 | typedef struct { |
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55 | IMFS_jnode_t *link_node; |
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56 | } IMFS_link_t; |
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57 | |
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58 | typedef struct { |
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59 | const char *name; |
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60 | } IMFS_sym_link_t; |
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61 | |
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62 | /* |
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63 | * IMFS "memfile" information |
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64 | * |
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65 | * The data structure for the in-memory "memfiles" is based on classic UNIX. |
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66 | * |
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67 | * block_ptr is a pointer to a block of IMFS_MEMFILE_BYTES_PER_BLOCK in |
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68 | * length which could be data or a table of pointers to blocks. |
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69 | * |
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70 | * Setting IMFS_MEMFILE_BYTES_PER_BLOCK to different values has a significant |
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71 | * impact on the maximum file size supported as well as the amount of |
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72 | * memory wasted due to internal file fragmentation. The following |
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73 | * is a list of maximum file sizes based on various settings |
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74 | * |
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75 | * max_filesize with blocks of 16 is 1,328 |
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76 | * max_filesize with blocks of 32 is 18,656 |
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77 | * max_filesize with blocks of 64 is 279,488 |
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78 | * max_filesize with blocks of 128 is 4,329,344 |
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79 | * max_filesize with blocks of 256 is 68,173,568 |
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80 | * max_filesize with blocks of 512 is 1,082,195,456 |
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81 | */ |
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82 | |
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83 | #define IMFS_MEMFILE_BYTES_PER_BLOCK 128 |
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84 | #define IMFS_MEMFILE_BLOCK_SLOTS \ |
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85 | (IMFS_MEMFILE_BYTES_PER_BLOCK / sizeof(void *)) |
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86 | |
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87 | typedef unsigned char * block_p; |
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88 | typedef block_p *block_ptr; |
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89 | |
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90 | typedef struct { |
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91 | off_t size; /* size of file in bytes */ |
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92 | block_ptr indirect; /* array of 128 data blocks pointers */ |
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93 | block_ptr doubly_indirect; /* 128 indirect blocks */ |
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94 | block_ptr triply_indirect; /* 128 doubly indirect blocks */ |
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95 | } IMFS_memfile_t; |
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96 | |
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97 | /* |
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98 | * Important block numbers for "memfiles" |
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99 | */ |
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100 | |
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101 | #define FIRST_INDIRECT (0) |
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102 | #define LAST_INDIRECT (IMFS_MEMFILE_BLOCK_SLOTS - 1) |
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103 | |
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104 | #define FIRST_DOUBLY_INDIRECT (LAST_INDIRECT + 1) |
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105 | #define LAST_DOUBLY_INDIRECT \ |
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106 | (LAST_INDIRECT + \ |
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107 | (IMFS_MEMFILE_BLOCK_SLOTS * IMFS_MEMFILE_BLOCK_SLOTS)) |
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108 | |
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109 | #define FIRST_TRIPLY_INDIRECT (LAST_DOUBLY_INDIRECT + 1) |
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110 | #define LAST_TRIPLY_INDIRECT \ |
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111 | (LAST_DOUBLY_INDIRECT +\ |
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112 | (IMFS_MEMFILE_BLOCK_SLOTS * \ |
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113 | IMFS_MEMFILE_BLOCK_SLOTS * IMFS_MEMFILE_BLOCK_SLOTS)) |
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114 | |
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115 | #define IMFS_MEMFILE_MAXIMUM_SIZE \ |
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116 | (LAST_TRIPLY_INDIRECT * IMFS_MEMFILE_BYTES_PER_BLOCK) |
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117 | |
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118 | /* |
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119 | * What types of IMFS file systems entities there can be. |
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120 | */ |
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121 | |
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122 | #define IMFS_jnode_types_t rtems_filesystem_node_types_t |
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123 | #define IMFS_DIRECTORY RTEMS_FILESYSTEM_DIRECTORY |
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124 | #define IMFS_DEVICE RTEMS_FILESYSTEM_DEVICE |
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125 | #define IMFS_HARD_LINK RTEMS_FILESYSTEM_HARD_LINK |
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126 | #define IMFS_SYM_LINK RTEMS_FILESYSTEM_SYM_LINK |
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127 | #define IMFS_MEMORY_FILE RTEMS_FILESYSTEM_MEMORY_FILE |
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128 | |
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129 | #define IMFS_NUMBER_OF_TYPES (IMFS_MEMORY_FILE + 1) |
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130 | |
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131 | typedef union { |
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132 | IMFS_directory_t directory; |
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133 | IMFS_device_t device; |
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134 | IMFS_link_t hard_link; |
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135 | IMFS_sym_link_t sym_link; |
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136 | IMFS_memfile_t file; |
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137 | } IMFS_types_union; |
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138 | |
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139 | /* |
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140 | * Maximum length of a "basename" of an IMFS file/node. |
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141 | */ |
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142 | |
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143 | #define IMFS_NAME_MAX 32 |
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144 | |
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145 | /* |
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146 | * The control structure for an IMFS jnode. |
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147 | */ |
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148 | |
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149 | struct IMFS_jnode_tt { |
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150 | Chain_Node Node; /* for chaining them together */ |
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151 | IMFS_jnode_t *Parent; /* Parent node */ |
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152 | char name[IMFS_NAME_MAX+1]; /* "basename" */ |
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153 | mode_t st_mode; /* File mode */ |
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154 | nlink_t st_nlink; /* Link count */ |
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155 | ino_t st_ino; /* inode */ |
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156 | |
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157 | uid_t st_uid; /* User ID of owner */ |
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158 | gid_t st_gid; /* Group ID of owner */ |
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159 | |
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160 | time_t stat_atime; /* Time of last access */ |
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161 | time_t stat_mtime; /* Time of last modification */ |
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162 | time_t stat_ctime; /* Time of last status change */ |
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163 | IMFS_jnode_types_t type; /* Type of this entry */ |
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164 | IMFS_types_union info; |
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165 | }; |
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166 | |
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167 | #define IMFS_update_atime( _jnode ) \ |
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168 | do { \ |
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169 | struct timeval tv; \ |
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170 | gettimeofday( &tv, 0 ); \ |
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171 | _jnode->stat_atime = (time_t) tv.tv_sec; \ |
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172 | } while (0) |
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173 | |
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174 | #define IMFS_update_mtime( _jnode ) \ |
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175 | do { \ |
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176 | struct timeval tv; \ |
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177 | gettimeofday( &tv, 0 ); \ |
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178 | _jnode->stat_mtime = (time_t) tv.tv_sec; \ |
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179 | } while (0) |
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180 | |
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181 | #define IMFS_update_ctime( _jnode ) \ |
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182 | do { \ |
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183 | struct timeval tv; \ |
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184 | gettimeofday( &tv, 0 ); \ |
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185 | _jnode->stat_ctime = (time_t) tv.tv_sec; \ |
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186 | } while (0) |
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187 | |
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188 | #define IMFS_atime_mtime_update( _jnode ) \ |
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189 | do { \ |
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190 | struct timeval tv; \ |
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191 | gettimeofday( &tv, 0 ); \ |
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192 | _jnode->stat_mtime = (time_t) tv.tv_sec; \ |
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193 | _jnode->stat_atime = (time_t) tv.tv_sec; \ |
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194 | } while (0) |
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195 | |
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196 | typedef struct { |
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197 | ino_t ino_count; |
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198 | rtems_filesystem_file_handlers_r *memfile_handlers; |
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199 | rtems_filesystem_file_handlers_r *directory_handlers; |
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200 | } IMFS_fs_info_t; |
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201 | |
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202 | #define increment_and_check_linkcounts( _fs_info ) \ |
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203 | ((IMFS_fs_info_t * )_fs_info)->link_counts++; \ |
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204 | if ( ((IMFS_fs_info_t * )_fs_info)->link_counts > MAXSYMLINKS ) \ |
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205 | set_errno_and_return_minus_one( ELOOP ) |
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206 | |
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207 | #define decrement_linkcounts( _fs_info ) \ |
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208 | ((IMFS_fs_info_t * )_fs_info)->link_counts--; |
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209 | |
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210 | /* |
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211 | * Type defination for tokens returned from IMFS_get_token |
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212 | */ |
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213 | |
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214 | typedef enum { |
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215 | IMFS_NO_MORE_PATH, |
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216 | IMFS_CURRENT_DIR, |
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217 | IMFS_UP_DIR, |
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218 | IMFS_NAME, |
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219 | IMFS_INVALID_TOKEN |
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220 | } IMFS_token_types; |
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221 | |
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222 | /* |
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223 | * Shared Data |
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224 | */ |
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225 | |
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226 | extern rtems_filesystem_file_handlers_r IMFS_directory_handlers; |
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227 | extern rtems_filesystem_file_handlers_r IMFS_device_handlers; |
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228 | extern rtems_filesystem_file_handlers_r IMFS_link_handlers; |
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229 | extern rtems_filesystem_file_handlers_r IMFS_memfile_handlers; |
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230 | extern rtems_filesystem_operations_table IMFS_ops; |
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231 | extern rtems_filesystem_operations_table miniIMFS_ops; |
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232 | extern rtems_filesystem_limits_and_options_t IMFS_LIMITS_AND_OPTIONS; |
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233 | |
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234 | /* |
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235 | * Routines |
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236 | */ |
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237 | |
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238 | int IMFS_initialize( |
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239 | rtems_filesystem_mount_table_entry_t *mt_entry |
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240 | ); |
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241 | |
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242 | int miniIMFS_initialize( |
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243 | rtems_filesystem_mount_table_entry_t *mt_entry |
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244 | ); |
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245 | |
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246 | int IMFS_initialize_support( |
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247 | rtems_filesystem_mount_table_entry_t *mt_entry, |
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248 | rtems_filesystem_operations_table *op_table, |
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249 | rtems_filesystem_file_handlers_r *memfile_handlers, |
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250 | rtems_filesystem_file_handlers_r *directory_handlers |
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251 | ); |
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252 | |
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253 | int IMFS_fsunmount( |
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254 | rtems_filesystem_mount_table_entry_t *mt_entry |
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255 | ); |
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256 | |
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257 | |
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258 | /* |
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259 | * Returns the number of characters copied from path to token. |
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260 | */ |
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261 | IMFS_token_types IMFS_get_token( |
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262 | const char *path, |
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263 | char *token, |
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264 | int *token_len |
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265 | ); |
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266 | |
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267 | void IMFS_dump( void ); |
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268 | |
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269 | void IMFS_initialize_jnode( |
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270 | IMFS_jnode_t *the_jnode, |
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271 | IMFS_jnode_types_t type, |
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272 | IMFS_jnode_t *the_parent, |
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273 | char *name, |
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274 | mode_t mode |
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275 | ); |
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276 | |
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277 | IMFS_jnode_t *IMFS_find_match_in_dir( |
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278 | IMFS_jnode_t *directory, /* IN */ |
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279 | char *name /* IN */ |
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280 | ); |
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281 | |
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282 | rtems_filesystem_node_types_t IMFS_node_type( |
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283 | rtems_filesystem_location_info_t *pathloc /* IN */ |
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284 | ); |
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285 | |
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286 | int IMFS_stat( |
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287 | rtems_filesystem_location_info_t *loc, /* IN */ |
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288 | struct stat *buf /* OUT */ |
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289 | ); |
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290 | |
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291 | int IMFS_Set_handlers( |
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292 | rtems_filesystem_location_info_t *loc |
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293 | ); |
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294 | |
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295 | int IMFS_evaluate_link( |
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296 | rtems_filesystem_location_info_t *node, /* IN/OUT */ |
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297 | int flags /* IN */ |
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298 | ); |
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299 | |
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300 | int IMFS_eval_path( |
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301 | const char *pathname, /* IN */ |
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302 | int flags, /* IN */ |
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303 | rtems_filesystem_location_info_t *pathloc /* IN/OUT */ |
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304 | ); |
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305 | |
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306 | |
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307 | int IMFS_link( |
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308 | rtems_filesystem_location_info_t *to_loc, /* IN */ |
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309 | rtems_filesystem_location_info_t *parent_loc, /* IN */ |
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310 | const char *token /* IN */ |
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311 | ); |
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312 | |
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313 | int IMFS_unlink( |
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314 | rtems_filesystem_location_info_t *pathloc /* IN */ |
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315 | ); |
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316 | |
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317 | int IMFS_chown( |
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318 | rtems_filesystem_location_info_t *pathloc, /* IN */ |
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319 | uid_t owner, /* IN */ |
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320 | gid_t group /* IN */ |
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321 | ); |
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322 | |
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323 | int IMFS_freenodinfo( |
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324 | rtems_filesystem_location_info_t *pathloc /* IN */ |
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325 | ); |
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326 | |
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327 | int IMFS_mknod( |
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328 | const char *path, /* IN */ |
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329 | mode_t mode, /* IN */ |
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330 | dev_t dev, /* IN */ |
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331 | rtems_filesystem_location_info_t *pathloc /* IN/OUT */ |
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332 | ); |
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333 | |
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334 | IMFS_jnode_t *IMFS_create_node( |
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335 | rtems_filesystem_location_info_t *parent_loc, /* IN */ |
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336 | IMFS_jnode_types_t type, /* IN */ |
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337 | char *name, /* IN */ |
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338 | mode_t mode, /* IN */ |
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339 | IMFS_types_union *info /* IN */ |
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340 | ); |
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341 | |
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342 | int IMFS_evaluate_for_make( |
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343 | const char *path, /* IN */ |
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344 | rtems_filesystem_location_info_t *pathloc, /* IN/OUT */ |
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345 | const char **name /* OUT */ |
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346 | ); |
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347 | |
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348 | int IMFS_mount( |
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349 | rtems_filesystem_mount_table_entry_t *mt_entry /* IN */ |
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350 | ); |
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351 | |
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352 | int IMFS_unmount( |
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353 | rtems_filesystem_mount_table_entry_t *mt_entry /* IN */ |
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354 | ); |
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355 | |
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356 | int IMFS_freenod( |
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357 | rtems_filesystem_location_info_t *node /* IN/OUT */ |
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358 | ); |
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359 | |
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360 | int IMFS_memfile_remove( |
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361 | IMFS_jnode_t *the_jnode /* IN/OUT */ |
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362 | ); |
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363 | |
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364 | int memfile_ftruncate( |
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365 | rtems_libio_t *iop, /* IN */ |
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366 | off_t length /* IN */ |
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367 | ); |
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368 | |
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369 | int imfs_dir_open( |
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370 | rtems_libio_t *iop, /* IN */ |
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371 | const char *pathname, /* IN */ |
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372 | unsigned32 flag, /* IN */ |
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373 | unsigned32 mode /* IN */ |
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374 | ); |
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375 | |
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376 | int imfs_dir_close( |
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377 | rtems_libio_t *iop /* IN */ |
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378 | ); |
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379 | |
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380 | int imfs_dir_read( |
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381 | rtems_libio_t *iop, /* IN */ |
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382 | void *buffer, /* IN */ |
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383 | unsigned32 count /* IN */ |
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384 | ); |
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385 | |
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386 | int imfs_dir_lseek( |
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387 | rtems_libio_t *iop, /* IN */ |
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388 | off_t offset, /* IN */ |
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389 | int whence /* IN */ |
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390 | ); |
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391 | |
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392 | int imfs_dir_fstat( |
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393 | rtems_filesystem_location_info_t *loc, /* IN */ |
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394 | struct stat *buf /* OUT */ |
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395 | ); |
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396 | |
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397 | int imfs_dir_rmnod( |
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398 | rtems_filesystem_location_info_t *pathloc /* IN */ |
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399 | ); |
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400 | |
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401 | int memfile_open( |
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402 | rtems_libio_t *iop, /* IN */ |
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403 | const char *pathname, /* IN */ |
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404 | unsigned32 flag, /* IN */ |
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405 | unsigned32 mode /* IN */ |
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406 | ); |
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407 | |
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408 | int memfile_close( |
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409 | rtems_libio_t *iop /* IN */ |
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410 | ); |
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411 | |
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412 | int memfile_read( |
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413 | rtems_libio_t *iop, /* IN */ |
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414 | void *buffer, /* IN */ |
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415 | unsigned32 count /* IN */ |
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416 | ); |
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417 | |
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418 | int memfile_write( |
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419 | rtems_libio_t *iop, /* IN */ |
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420 | const void *buffer, /* IN */ |
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421 | unsigned32 count /* IN */ |
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422 | ); |
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423 | |
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424 | int memfile_ioctl( |
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425 | rtems_libio_t *iop, /* IN */ |
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426 | unsigned32 command, /* IN */ |
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427 | void *buffer /* IN */ |
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428 | ); |
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429 | |
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430 | int memfile_lseek( |
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431 | rtems_libio_t *iop, /* IN */ |
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432 | off_t offset, /* IN */ |
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433 | int whence /* IN */ |
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434 | ); |
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435 | |
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436 | int memfile_rmnod( |
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437 | rtems_filesystem_location_info_t *pathloc /* IN */ |
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438 | ); |
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439 | |
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440 | int device_open( |
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441 | rtems_libio_t *iop, /* IN */ |
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442 | const char *pathname, /* IN */ |
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443 | unsigned32 flag, /* IN */ |
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444 | unsigned32 mode /* IN */ |
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445 | ); |
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446 | |
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447 | int device_close( |
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448 | rtems_libio_t *iop /* IN */ |
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449 | ); |
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450 | |
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451 | int device_read( |
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452 | rtems_libio_t *iop, /* IN */ |
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453 | void *buffer, /* IN */ |
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454 | unsigned32 count /* IN */ |
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455 | ); |
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456 | |
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457 | int device_write( |
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458 | rtems_libio_t *iop, /* IN */ |
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459 | const void *buffer, /* IN */ |
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460 | unsigned32 count /* IN */ |
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461 | ); |
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462 | |
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463 | int device_ioctl( |
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464 | rtems_libio_t *iop, /* IN */ |
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465 | unsigned32 command, /* IN */ |
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466 | void *buffer /* IN */ |
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467 | ); |
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468 | |
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469 | int device_lseek( |
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470 | rtems_libio_t *iop, /* IN */ |
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471 | off_t offset, /* IN */ |
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472 | int whence /* IN */ |
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473 | ); |
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474 | |
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475 | int IMFS_utime( |
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476 | rtems_filesystem_location_info_t *pathloc, /* IN */ |
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477 | time_t actime, /* IN */ |
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478 | time_t modtime /* IN */ |
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479 | ); |
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480 | |
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481 | int IMFS_fchmod( |
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482 | rtems_filesystem_location_info_t *loc, |
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483 | mode_t mode |
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484 | ); |
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485 | |
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486 | int IMFS_symlink( |
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487 | rtems_filesystem_location_info_t *parent_loc, /* IN */ |
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488 | const char *link_name, |
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489 | const char *node_name |
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490 | ); |
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491 | |
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492 | int IMFS_readlink( |
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493 | rtems_filesystem_location_info_t *loc, /* IN */ |
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494 | char *buf, /* OUT */ |
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495 | size_t bufsize |
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496 | ); |
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497 | |
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498 | int IMFS_fdatasync( |
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499 | rtems_libio_t *iop |
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500 | ); |
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501 | |
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502 | int IMFS_fcntl( |
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503 | int cmd, |
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504 | rtems_libio_t *iop |
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505 | ); |
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506 | |
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507 | int IMFS_rmnod( |
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508 | rtems_filesystem_location_info_t *pathloc /* IN */ |
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509 | ); |
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510 | |
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511 | #ifdef __cplusplus |
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512 | } |
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513 | #endif |
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514 | |
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515 | #endif |
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516 | /* end of include file */ |
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