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Rev | Author | Line No. | Line |
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3935 | shikhin | 1 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
2 | ;; ;; |
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3 | ;; Contains ext2 structures, and macros. ;; |
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4 | ;; ;; |
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5363 | yogev_ezra | 5 | ;; Copyright (C) KolibriOS team 2013-2015. All rights reserved. ;; |
4891 | shikhin | 6 | ;; Distributed under terms of the GNU General Public License ;; |
3935 | shikhin | 7 | ;; ;; |
8 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
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9 | |||
4850 | mario79 | 10 | $Revision: 5363 $ |
11 | |||
12 | |||
4066 | shikhin | 13 | ; Future jobs for driver, in order of preference: |
14 | ; * clean up existing extents support. |
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15 | ; * add b-tree directories support. |
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16 | ; * add long file support. |
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17 | ; * add journal support. |
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18 | ; * add minor features that come with ext3/4. |
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19 | |||
3935 | shikhin | 20 | ; Recommended move to some kernel-wide bitmap handling code (with a bit of abstraction, of course). |
21 | |||
22 | ;--------------------------------------------------------------------- |
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23 | ; Clears a bit. |
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24 | ; Input: eax = index into bitmap. |
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25 | ; [EXTFS.ext2_save_block] = address of bitmap. |
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26 | ; ebp = address of EXTFS. |
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27 | ; Output: Bit cleared. |
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28 | ; eax = non-zero, if already cleared. |
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29 | ;--------------------------------------------------------------------- |
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30 | bitmap_clear_bit: |
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31 | push ebx ecx edx |
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32 | |||
33 | xor edx, edx |
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34 | mov ecx, 8 |
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35 | div ecx |
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36 | |||
37 | add eax, [ebp + EXTFS.ext2_save_block] |
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38 | |||
39 | ; Get the mask. |
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40 | mov ebx, 1 |
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41 | mov ecx, edx |
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42 | shl ebx, cl |
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43 | |||
44 | test [eax], ebx |
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45 | jz .cleared |
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46 | |||
47 | not ebx |
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48 | and [eax], ebx |
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49 | |||
50 | xor eax, eax |
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51 | .return: |
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52 | pop edx ecx ebx |
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53 | ret |
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54 | |||
55 | ; Already cleared. |
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56 | .cleared: |
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57 | xor eax, eax |
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58 | not eax |
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59 | jmp .return |
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60 | |||
61 | ;--------------------------------------------------------------------- |
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62 | ; Finds free bit in the bitmap. |
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63 | ; Input: ecx = number of bits in the bitmap. |
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64 | ; [EXTFS.ext2_save_block] = address of bitmap. |
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65 | ; ebp = address of EXTFS. |
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66 | ; Output: eax = index of free bit in the bitmap; marked set. |
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67 | ; 0xFFFFFFFF if no free bit found. |
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68 | ;--------------------------------------------------------------------- |
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69 | ext2_find_free_bit: |
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70 | bitmap_find_free_bit: |
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71 | push esi ebx ecx edx |
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72 | mov esi, [ebp + EXTFS.ext2_save_block] |
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73 | |||
74 | ; Get total DWORDS in eax; total bits in last dword, if any, in edx. |
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75 | xor edx, edx |
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76 | mov eax, ecx |
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77 | mov ecx, 32 |
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78 | div ecx |
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79 | |||
80 | mov ecx, eax |
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81 | xor eax, eax |
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82 | push edx |
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83 | |||
84 | test ecx, ecx |
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85 | jz .last_bits |
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86 | |||
87 | ; Check in the DWORDS. |
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88 | .dwords: |
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89 | mov ebx, [esi] |
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90 | not ebx |
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91 | |||
92 | bsf edx, ebx |
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93 | |||
94 | ; If 0, then the original value would be 0xFFFFFFFF, hence no free bits. |
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95 | jz @F |
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96 | |||
97 | ; We found the value. Let's return with it. |
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98 | add esp, 4 |
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4066 | shikhin | 99 | |
3935 | shikhin | 100 | add eax, edx |
101 | jmp .return |
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102 | |||
103 | @@: |
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104 | add esi, 4 |
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105 | add eax, 32 |
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106 | loop .dwords |
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107 | |||
108 | .last_bits: |
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109 | ; Check in the last few bits. |
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110 | pop ecx |
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111 | test ecx, ecx |
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112 | jz @F |
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113 | |||
114 | mov ebx, [esi] |
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115 | not ebx |
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116 | bsf ebx, edx |
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117 | |||
118 | ; If 0, no free bits. |
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119 | jz @F |
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120 | |||
121 | ; If free bit is greater than the last known bit, then error. |
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122 | cmp edx, ecx |
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123 | jg @F |
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124 | |||
125 | add eax, edx |
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126 | jmp .return |
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127 | |||
128 | @@: |
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129 | ; Didn't find any free bits. |
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130 | xor eax, eax |
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131 | not eax |
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132 | jmp @F |
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133 | |||
134 | .return: |
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135 | mov ecx, edx |
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136 | mov edx, 1 |
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137 | shl edx, cl |
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138 | or [esi], edx |
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139 | |||
140 | @@: |
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141 | pop edx ecx ebx esi |
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142 | ret |
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143 | |||
144 | ; Recommended move to some kernel-wide string handling code. |
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145 | ;--------------------------------------------------------------------- |
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146 | ; Find the length of a string. |
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147 | ; Input: esi = source. |
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148 | ; Output: length in ecx |
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149 | ;--------------------------------------------------------------------- |
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150 | strlen: |
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151 | push eax esi |
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152 | xor ecx, ecx |
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153 | |||
154 | @@: |
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155 | lodsb |
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156 | test al, al |
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157 | jz .ret |
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158 | |||
159 | inc ecx |
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160 | jmp @B |
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161 | |||
162 | .ret: |
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163 | pop esi eax |
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164 | ret |
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165 | |||
166 | ;--------------------------------------------------------------------- |
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167 | ; Convert UTF-8 string to ASCII-string (codepage 866) |
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168 | ; Input: esi = source. |
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169 | ; edi = buffer. |
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170 | ; ecx = length of source. |
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171 | ; Output: destroys eax, esi, edi |
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172 | ;--------------------------------------------------------------------- |
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173 | utf8_to_cp866: |
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174 | ; Check for zero-length string. |
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175 | jecxz .return |
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176 | |||
177 | .start: |
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178 | lodsw |
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179 | cmp al, 0x80 |
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180 | jb .ascii |
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181 | |||
182 | xchg al, ah ; Big-endian. |
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183 | cmp ax, 0xd080 |
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184 | jz .yo1 |
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185 | |||
186 | cmp ax, 0xd191 |
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187 | jz .yo2 |
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188 | |||
189 | cmp ax, 0xd090 |
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190 | jb .unk |
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191 | |||
192 | cmp ax, 0xd180 |
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193 | jb .rus1 |
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194 | |||
195 | cmp ax, 0xd190 |
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196 | jb .rus2 |
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197 | |||
198 | .unk: |
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199 | mov al, '_' |
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200 | jmp .doit |
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201 | |||
202 | .yo1: |
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203 | mov al, 0xf0 ; Ё capital. |
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204 | jmp .doit |
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205 | |||
206 | .yo2: |
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207 | mov al, 0xf1 ; ё small. |
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208 | jmp .doit |
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209 | |||
210 | .rus1: |
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211 | sub ax, 0xd090 - 0x80 |
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212 | jmp .doit |
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213 | |||
214 | .rus2: |
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215 | sub ax, 0xd18f - 0xEF |
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216 | |||
217 | .doit: |
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218 | stosb |
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219 | sub ecx, 2 |
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220 | ja .start |
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221 | ret |
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222 | |||
223 | .ascii: |
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224 | stosb |
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225 | dec esi |
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226 | dec ecx |
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227 | jnz .start |
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228 | |||
229 | .return: |
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230 | ret |
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231 | |||
232 | ; Recommended move to some kernel-wide time handling code. |
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233 | |||
234 | ; Total cumulative seconds till each month. |
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235 | cumulative_seconds_in_month: |
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236 | .january: dd 0 * (60 * 60 * 24) |
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237 | .february: dd 31 * (60 * 60 * 24) |
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238 | .march: dd 59 * (60 * 60 * 24) |
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239 | .april: dd 90 * (60 * 60 * 24) |
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240 | .may: dd 120 * (60 * 60 * 24) |
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241 | .june: dd 151 * (60 * 60 * 24) |
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242 | .july: dd 181 * (60 * 60 * 24) |
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243 | .august: dd 212 * (60 * 60 * 24) |
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244 | .september: dd 243 * (60 * 60 * 24) |
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245 | .october: dd 273 * (60 * 60 * 24) |
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246 | .november: dd 304 * (60 * 60 * 24) |
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247 | .december: dd 334 * (60 * 60 * 24) |
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248 | |||
249 | current_bdfe_time: |
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250 | dd 0 |
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251 | current_bdfe_date: |
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252 | dd 0 |
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253 | |||
254 | ;--------------------------------------------------------------------- |
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255 | ; Stores current unix time. |
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256 | ; Input: edi = buffer to output Unix time. |
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257 | ;--------------------------------------------------------------------- |
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258 | current_unix_time: |
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259 | push eax esi |
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260 | mov esi, current_bdfe_time |
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261 | |||
262 | ; Just a small observation: |
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263 | ; The CMOS is a pretty bad source to get time from. One shouldn't rely on it, |
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264 | ; since it messes up the time by tiny bits. Of course, this is all technical, |
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265 | ; but one can look it up on the osdev wiki. What is better is to get the time |
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266 | ; from CMOS during boot, then update system time using a more accurate timer. |
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267 | ; I'll probably add that after the Summer of Code, so TODO! TODO! TODO!. |
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268 | |||
269 | ; Get time from CMOS. |
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270 | ; Seconds. |
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271 | mov al, 0x00 |
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272 | out 0x70, al |
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273 | in al, 0x71 |
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274 | call bcd2bin |
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275 | mov [esi + 0], al |
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276 | |||
277 | ; Minute. |
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278 | mov al, 0x02 |
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279 | out 0x70, al |
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280 | in al, 0x71 |
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281 | call bcd2bin |
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282 | mov [esi + 1], al |
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283 | |||
284 | ; Hour. |
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285 | mov al, 0x04 |
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286 | out 0x70, al |
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287 | in al, 0x71 |
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288 | call bcd2bin |
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289 | mov [esi + 2], al |
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290 | |||
291 | ; Get date. |
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292 | |||
293 | ; Day. |
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294 | mov al, 0x7 |
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295 | out 0x70, al |
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296 | in al, 0x71 |
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297 | call bcd2bin |
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298 | mov [esi + 4], al |
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299 | |||
300 | ; Month. |
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301 | mov al, 0x8 |
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302 | out 0x70, al |
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303 | in al, 0x71 |
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304 | call bcd2bin |
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305 | mov [esi + 5], al |
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306 | |||
307 | ; Year. |
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308 | mov al, 0x9 |
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309 | out 0x70, al |
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310 | in al, 0x71 |
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311 | call bcd2bin |
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312 | add ax, 2000 ; CMOS only returns last two digits. |
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313 | ; Note that everywhere in KolibriOS this is used. |
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314 | ; This is hacky, since the RTC can be incorrectly set |
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315 | ; to something before 2000. |
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316 | mov [esi + 6], ax |
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317 | |||
318 | call bdfe_to_unix_time |
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319 | pop esi eax |
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320 | ret |
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321 | |||
322 | ;--------------------------------------------------------------------- |
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323 | ; Convert time+date from BDFE to Unix time. |
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324 | ; Input: esi = pointer to BDFE time+date. |
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325 | ; edi = buffer to output Unix time. |
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326 | ;--------------------------------------------------------------------- |
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327 | bdfe_to_unix_time: |
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328 | push eax ebx ecx edx |
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329 | mov dword[edi], 0x00000000 |
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330 | |||
331 | ; The minimum representable time is 1901-12-13. |
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332 | cmp word[esi + 6], 1901 |
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333 | jb .ret |
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334 | jg .max |
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335 | |||
336 | cmp byte[esi + 5], 12 |
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337 | jb .ret |
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338 | |||
339 | cmp byte[esi + 4], 13 |
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340 | jbe .ret |
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341 | jg .convert |
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342 | |||
343 | ; Check if it is more than the maximum representable time. |
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344 | .max: |
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345 | ; The maximum representable time is 2038-01-19. |
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346 | cmp word[esi + 6], 2038 |
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347 | jg .ret |
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348 | jb .convert |
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349 | |||
350 | cmp byte[esi + 5], 1 |
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351 | jg .ret |
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352 | |||
353 | cmp byte[esi + 4], 19 |
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354 | jge .ret |
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355 | |||
356 | ; Convert the time. |
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357 | .convert: |
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358 | ; Get if current year is leap year in ECX. |
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359 | xor ecx, ecx |
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360 | mov ebx, 4 |
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361 | xor edx, edx |
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362 | |||
363 | cmp word[esi + 6], 1970 |
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364 | jb .negative |
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365 | |||
366 | movzx eax, word[esi + 6] ; Year. |
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367 | cmp byte[esi + 5], 3 ; If the month is less than March, than that year doesn't matter. |
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368 | jge @F |
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369 | |||
370 | test eax, 3 |
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371 | ; Not a leap year. |
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372 | jnz @F |
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373 | |||
374 | inc ecx |
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375 | @@: |
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376 | ; Number of leap years between two years = ((end date - 1)/4) - (1970/4) |
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377 | dec eax |
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378 | div ebx |
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379 | sub eax, 1970/4 |
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380 | |||
381 | ; EAX is the number of leap years. |
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382 | add eax, ecx |
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383 | mov ecx, (60 * 60 * 24) ; Seconds in a day. |
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384 | mul ecx |
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385 | |||
386 | ; Account for leap years, i.e., one day extra for each. |
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387 | add [edi], eax |
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388 | |||
389 | ; Get total days in EAX. |
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390 | movzx eax, byte[esi + 4] |
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391 | dec eax |
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392 | mul ecx |
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393 | |||
394 | ; Account for days. |
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395 | add [edi], eax |
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396 | |||
397 | ; Account for month. |
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398 | movzx eax, byte[esi + 5] |
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399 | dec eax |
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400 | mov eax, [cumulative_seconds_in_month + (eax * 4)] |
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401 | add [edi], eax |
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402 | |||
403 | ; Account for year. |
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404 | movzx eax, word[esi + 6] |
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405 | sub eax, 1970 |
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406 | mov ecx, (60 * 60 * 24) * 365 ; Seconds in a year. |
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407 | mul ecx |
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408 | add [edi], eax |
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409 | |||
410 | ; Seconds. |
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411 | movzx eax, byte[esi + 0] |
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412 | add [edi], eax |
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413 | |||
414 | ; Minutes. |
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415 | movzx eax, byte[esi + 1] |
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416 | mov ecx, 60 |
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417 | mul ecx |
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418 | add [edi], eax |
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419 | |||
420 | ; Hours. |
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421 | movzx eax, byte[esi + 2] |
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422 | mov ecx, (60 * 60) |
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423 | mul ecx |
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424 | add [edi], eax |
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425 | |||
426 | ; The time wanted is before the epoch; handle it here. |
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427 | .negative: |
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428 | ; TODO. |
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429 | |||
430 | .ret: |
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431 | pop edx ecx ebx eax |
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432 | ret |
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433 | |||
434 | ; Recommended move to some kernel-wide alloc handling code. |
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435 | macro KERNEL_ALLOC store, label |
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436 | { |
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437 | call kernel_alloc |
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438 | mov store, eax |
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439 | test eax, eax |
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440 | jz label |
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441 | } |
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442 | |||
443 | macro KERNEL_FREE data, label |
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444 | { |
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445 | cmp data, 0 |
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446 | jz label |
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447 | push data |
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448 | call kernel_free |
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449 | } |
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450 | |||
451 | struct EXTFS PARTITION |
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452 | lock MUTEX |
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453 | partition_flags dd ? |
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454 | log_block_size dd ? |
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455 | block_size dd ? |
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456 | count_block_in_block dd ? |
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457 | blocks_per_group dd ? |
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458 | global_desc_table dd ? |
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459 | root_inode dd ? ; Pointer to root inode in memory. |
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460 | inode_size dd ? |
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461 | count_pointer_in_block dd ? ; (block_size / 4) |
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462 | count_pointer_in_block_square dd ? ; (block_size / 4)**2 |
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463 | ext2_save_block dd ? ; Block for 1 global procedure. |
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464 | ext2_temp_block dd ? ; Block for small procedures. |
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465 | ext2_save_inode dd ? ; inode for global procedures. |
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466 | ext2_temp_inode dd ? ; inode for small procedures. |
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467 | groups_count dd ? |
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468 | superblock rd 1024/4 |
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469 | ends |
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470 | |||
471 | ; EXT2 revisions. |
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472 | EXT2_GOOD_OLD_REV = 0 |
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473 | |||
474 | ; For fs_type. |
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475 | FS_TYPE_UNDEFINED = 0 |
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476 | FS_TYPE_EXT = 2 |
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477 | |||
478 | ; Some set inodes. |
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479 | EXT2_BAD_INO = 1 |
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480 | EXT2_ROOT_INO = 2 |
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481 | EXT2_ACL_IDX_INO = 3 |
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482 | EXT2_ACL_DATA_INO = 4 |
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483 | EXT2_BOOT_LOADER_INO = 5 |
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484 | EXT2_UNDEL_DIR_INO = 6 |
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485 | |||
486 | ; EXT2_SUPER_MAGIC. |
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487 | EXT2_SUPER_MAGIC = 0xEF53 |
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488 | EXT2_VALID_FS = 1 |
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489 | |||
490 | ; Flags defining i_mode values. |
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491 | EXT2_S_IFMT = 0xF000 ; Mask for file type. |
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492 | |||
493 | EXT2_S_IFREG = 0x8000 ; Regular file. |
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494 | EXT2_S_IFDIR = 0x4000 ; Directory. |
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495 | |||
4067 | shikhin | 496 | EXT2_S_IRUSR = 0x0100 ; User read |
497 | EXT2_S_IWUSR = 0x0080 ; User write |
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498 | EXT2_S_IXUSR = 0x0040 ; User execute |
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499 | EXT2_S_IRGRP = 0x0020 ; Group read |
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500 | EXT2_S_IWGRP = 0x0010 ; Group write |
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501 | EXT2_S_IXGRP = 0x0008 ; Group execute |
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502 | EXT2_S_IROTH = 0x0004 ; Others read |
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503 | EXT2_S_IWOTH = 0x0002 ; Others write |
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504 | EXT2_S_IXOTH = 0x0001 ; Others execute |
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505 | |||
506 | PERMISSIONS = EXT2_S_IRUSR or EXT2_S_IWUSR \ |
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507 | or EXT2_S_IRGRP or EXT2_S_IWGRP \ |
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508 | or EXT2_S_IROTH or EXT2_S_IWOTH |
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509 | |||
3935 | shikhin | 510 | ; File type defining values in directory entry. |
511 | EXT2_FT_REG_FILE = 1 ; Regular file. |
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512 | EXT2_FT_DIR = 2 ; Directory. |
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513 | |||
514 | ; Flags used by KolibriOS. |
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515 | FS_FT_HIDDEN = 2 |
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516 | FS_FT_DIR = 0x10 ; Directory. |
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517 | |||
518 | ; ext2 partition flags. |
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519 | EXT2_RO = 0x01 |
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520 | |||
521 | FS_FT_ASCII = 0 ; Name in ASCII. |
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522 | FS_FT_UNICODE = 1 ; Name in Unicode. |
||
523 | |||
524 | EXT2_FEATURE_INCOMPAT_FILETYPE = 0x0002 ; Have file type in directory entry. |
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525 | EXT4_FEATURE_INCOMPAT_EXTENTS = 0x0040 ; Extents. |
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526 | EXT4_FEATURE_INCOMPAT_FLEX_BG = 0x0200 ; Flexible block groups. |
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527 | |||
528 | EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER = 0x0001 ; Sparse Superblock |
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529 | EXT2_FEATURE_RO_COMPAT_LARGE_FILE = 0x0002 ; Large file support (64-bit file size) |
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530 | |||
531 | ; Implemented ext[2,3,4] features. |
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532 | EXT4_FEATURE_INCOMPAT_SUPP = EXT2_FEATURE_INCOMPAT_FILETYPE \ |
||
533 | or EXT4_FEATURE_INCOMPAT_EXTENTS \ |
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534 | or EXT4_FEATURE_INCOMPAT_FLEX_BG |
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535 | |||
536 | ; Implemented features which otherwise require "read-only" mount. |
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537 | EXT2_FEATURE_RO_COMPAT_SUPP = EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER \ |
||
538 | or EXT2_FEATURE_RO_COMPAT_LARGE_FILE |
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539 | |||
540 | ; ext4 features not support for write. |
||
541 | EXT4_FEATURE_INCOMPAT_W_NOT_SUPP = EXT4_FEATURE_INCOMPAT_EXTENTS \ |
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542 | or EXT4_FEATURE_INCOMPAT_FLEX_BG |
||
543 | |||
544 | ; Flags specified in i_flags. |
||
545 | EXT2_EXTENTS_FL = 0x00080000 ; Extents. |
||
546 | |||
547 | struct EXT2_INODE_STRUC |
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548 | i_mode dw ? |
||
549 | i_uid dw ? |
||
550 | i_size dd ? |
||
551 | i_atime dd ? |
||
552 | i_ctime dd ? |
||
553 | i_mtime dd ? |
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554 | i_dtime dd ? |
||
555 | i_gid dw ? |
||
556 | i_links_count dw ? |
||
557 | i_blocks dd ? |
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558 | i_flags dd ? |
||
559 | i_osd1 dd ? |
||
560 | i_block rd 15 |
||
561 | i_generation dd ? |
||
562 | i_file_acl dd ? |
||
563 | i_dir_acl dd ? |
||
564 | i_faddr dd ? |
||
565 | i_osd2 dd ? ; 12 bytes. |
||
566 | ends |
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567 | |||
568 | struct EXT2_DIR_STRUC |
||
569 | inode dd ? |
||
570 | rec_len dw ? |
||
571 | name_len db ? |
||
572 | file_type db ? |
||
573 | name db ? ; 255 (max) bytes. |
||
574 | ends |
||
575 | |||
576 | struct EXT2_BLOCK_GROUP_DESC |
||
577 | block_bitmap dd ? ; +0 |
||
578 | inode_bitmap dd ? ; +4 |
||
579 | inode_table dd ? ; +8 |
||
580 | free_blocks_count dw ? ; +12 |
||
581 | free_inodes_count dw ? ; +14 |
||
582 | used_dirs_count dw ? ; +16 |
||
583 | pad dw ? ; +18 |
||
584 | reserved rb 12 ; +20 |
||
585 | ends |
||
586 | |||
587 | struct EXT2_SB_STRUC |
||
588 | inodes_count dd ? ; +0 |
||
589 | blocks_count dd ? ; +4 |
||
590 | r_block_count dd ? ; +8 |
||
591 | free_block_count dd ? ; +12 |
||
592 | free_inodes_count dd ? ; +16 |
||
593 | first_data_block dd ? ; +20 |
||
594 | log_block_size dd ? ; +24 |
||
595 | log_frag_size dd ? ; +28 |
||
596 | blocks_per_group dd ? ; +32 |
||
597 | frags_per_group dd ? ; +36 |
||
598 | inodes_per_group dd ? ; +40 |
||
599 | mtime dd ? ; +44 |
||
600 | wtime dd ? ; +48 |
||
601 | mnt_count dw ? ; +52 |
||
602 | max_mnt_count dw ? ; +54 |
||
603 | magic dw ? ; +56 |
||
604 | state dw ? ; +58 |
||
605 | errors dw ? ; +60 |
||
606 | minor_rev_level dw ? ; +62 |
||
607 | lastcheck dd ? ; +64 |
||
608 | check_intervals dd ? ; +68 |
||
609 | creator_os dd ? ; +72 |
||
610 | rev_level dd ? ; +76 |
||
611 | def_resuid dw ? ; +80 |
||
612 | def_resgid dw ? ; +82 |
||
613 | first_ino dd ? ; +84 |
||
614 | inode_size dw ? ; +88 |
||
615 | block_group_nr dw ? ; +90 |
||
616 | feature_compat dd ? ; +92 |
||
617 | feature_incompat dd ? ; +96 |
||
618 | feature_ro_compat dd ? ; +100 |
||
619 | uuid rb 16 ; +104 |
||
620 | volume_name rb 16 ; +120 |
||
621 | last_mounted rb 64 ; +136 |
||
622 | algo_bitmap dd ? ; +200 |
||
623 | prealloc_blocks db ? ; +204 |
||
624 | preallock_dir_blocks db ? ; +205 |
||
625 | reserved_gdt_blocks dw ? ; +206 |
||
626 | journal_uuid rb 16 ; +208 |
||
627 | journal_inum dd ? ; +224 |
||
628 | journal_dev dd ? ; +228 |
||
629 | last_orphan dd ? ; +232 |
||
630 | hash_seed rd 4 ; +236 |
||
631 | def_hash_version db ? ; +252 |
||
632 | reserved rb 3 ; +253 (reserved) |
||
633 | default_mount_options dd ? ; +256 |
||
634 | first_meta_bg dd ? ; +260 |
||
635 | mkfs_time dd ? ; +264 |
||
636 | jnl_blocks rd 17 ; +268 |
||
637 | blocks_count_hi dd ? ; +336 |
||
638 | r_blocks_count_hi dd ? ; +340 |
||
639 | free_blocks_count_hi dd ? ; +344 |
||
640 | min_extra_isize dw ? ; +348 |
||
641 | want_extra_isize dw ? ; +350 |
||
642 | flags dd ? ; +352 |
||
643 | raid_stride dw ? ; +356 |
||
644 | mmp_interval dw ? ; +358 |
||
645 | mmp_block dq ? ; +360 |
||
646 | raid_stripe_width dd ? ; +368 |
||
647 | log_groups_per_flex db ? ; +372 |
||
648 | ends |
||
649 | |||
650 | ; Header block extents. |
||
651 | struct EXT4_EXTENT_HEADER |
||
652 | eh_magic dw ? ; Magic value of 0xF30A, for ext4. |
||
653 | eh_entries dw ? ; Number of blocks covered by the extent. |
||
654 | eh_max dw ? ; Capacity of entries. |
||
655 | eh_depth dw ? ; Tree depth (if 0, extents in the array are not extent indexes) |
||
656 | eh_generation dd ? ; ??? |
||
657 | ends |
||
658 | |||
659 | ; Extent. |
||
660 | struct EXT4_EXTENT |
||
661 | ee_block dd ? ; First logical block extent covers. |
||
662 | ee_len dw ? ; Number of blocks covered by extent. |
||
663 | ee_start_hi dw ? ; Upper 16 bits of 48-bit address (unused in KOS) |
||
664 | ee_start_lo dd ? ; Lower 32 bits of 48-bit address. |
||
665 | ends |
||
666 | |||
667 | ; Index on-disk structure; pointer to block of extents/indexes. |
||
668 | struct EXT4_EXTENT_IDX |
||
669 | ei_block dd ? ; Covers logical blocks from here. |
||
670 | ei_leaf_lo dd ? ; Lower 32-bits of pointer to the physical block of the next level. |
||
671 | ei_leaf_hi dw ? ; Higher 16-bits (unused in KOS). |
||
672 | ei_unused dw ? ; Reserved. |
||
673 | ends |