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Rev | Author | Line No. | Line |
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4265 | Serge | 1 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
2 | ;; ;; |
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3 | ;; Contains ext2 initialization, plus syscall handling code. ;; |
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4 | ;; ;; |
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5201 | serge | 5 | ;; Copyright (C) KolibriOS team 2013-2014. All rights reserved. ;; |
6 | ;; Distributed under terms of the GNU General Public License ;; |
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4265 | Serge | 7 | ;; ;; |
8 | ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; |
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9 | |||
5201 | serge | 10 | $Revision: 5089 $ |
11 | |||
12 | |||
4265 | Serge | 13 | include 'ext2.inc' |
14 | include 'blocks.inc' |
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15 | include 'inode.inc' |
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16 | include 'resource.inc' |
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17 | |||
18 | iglobal |
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19 | align 4 |
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20 | ext2_user_functions: |
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21 | dd ext2_free |
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22 | dd (ext2_user_functions_end - ext2_user_functions - 4) / 4 |
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23 | dd ext2_Read |
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24 | dd ext2_ReadFolder |
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25 | dd ext2_Rewrite |
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26 | dd ext2_Write |
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27 | dd ext2_SetFileEnd |
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28 | dd ext2_GetFileInfo |
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29 | dd ext2_SetFileInfo |
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30 | dd 0 |
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31 | dd ext2_Delete |
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32 | dd ext2_CreateFolder |
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33 | ext2_user_functions_end: |
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34 | endg |
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35 | |||
36 | ;--------------------------------------------------------------------- |
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37 | ; Locks up an ext2 partition. |
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38 | ; Input: ebp = pointer to EXTFS. |
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39 | ;--------------------------------------------------------------------- |
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40 | proc ext2_lock |
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41 | lea ecx, [ebp + EXTFS.lock] |
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42 | jmp mutex_lock |
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43 | endp |
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44 | |||
45 | ;--------------------------------------------------------------------- |
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46 | ; Unlocks up an ext2 partition. |
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47 | ; Input: ebp = pointer to EXTFS. |
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48 | ;--------------------------------------------------------------------- |
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49 | proc ext2_unlock |
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50 | lea ecx, [ebp + EXTFS.lock] |
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51 | jmp mutex_unlock |
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52 | endp |
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53 | |||
54 | ;--------------------------------------------------------------------- |
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55 | ; Check if it's a valid ext* superblock. |
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56 | ; Input: ebp: first three fields of PARTITION structure. |
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57 | ; ebx + 512: points to 512-bytes buffer that can be used for anything. |
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58 | ; Output: eax: clear if can't create partition; set to EXTFS otherwise. |
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59 | ;--------------------------------------------------------------------- |
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60 | proc ext2_create_partition |
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61 | push ebx |
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5201 | serge | 62 | cmp dword [esi+DISK.MediaInfo.SectorSize], 512 |
63 | jnz .fail |
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4265 | Serge | 64 | |
65 | mov eax, 2 ; Superblock starts at 1024-bytes. |
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66 | add ebx, 512 ; Get pointer to fs-specific buffer. |
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67 | call fs_read32_sys |
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68 | test eax, eax |
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69 | jnz .fail |
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70 | |||
71 | ; Allowed 1KiB, 2KiB, 4KiB, 8KiB. |
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72 | cmp [ebx + EXT2_SB_STRUC.log_block_size], 3 |
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73 | ja .fail |
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74 | |||
75 | cmp [ebx + EXT2_SB_STRUC.magic], EXT2_SUPER_MAGIC |
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76 | jne .fail |
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77 | |||
78 | cmp [ebx + EXT2_SB_STRUC.state], EXT2_VALID_FS |
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79 | jne .fail |
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80 | |||
81 | ; Can't have no inodes per group. |
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82 | cmp [ebx + EXT2_SB_STRUC.inodes_per_group], 0 |
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83 | je .fail |
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84 | |||
85 | ; If incompatible features required, unusable superblock. |
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86 | mov eax, [ebx + EXT2_SB_STRUC.feature_incompat] |
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87 | test eax, not EXT4_FEATURE_INCOMPAT_SUPP |
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88 | jz .setup |
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89 | |||
90 | .fail: |
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91 | ; Not a (valid/usable) EXT2 superblock. |
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92 | pop ebx |
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93 | xor eax, eax |
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94 | ret |
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95 | |||
96 | .setup: |
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97 | movi eax, sizeof.EXTFS |
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98 | call malloc |
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99 | test eax, eax |
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100 | jz ext2_create_partition.fail |
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101 | |||
102 | ; Store the first sector field. |
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103 | mov ecx, dword[ebp + PARTITION.FirstSector] |
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104 | mov dword[eax + EXTFS.FirstSector], ecx |
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105 | mov ecx, dword [ebp + PARTITION.FirstSector+4] |
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106 | mov dword [eax + EXTFS.FirstSector+4], ecx |
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107 | |||
108 | ; The length field. |
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109 | mov ecx, dword[ebp + PARTITION.Length] |
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110 | mov dword[eax + EXTFS.Length], ecx |
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111 | mov ecx, dword[ebp + PARTITION.Length+4] |
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112 | mov dword[eax + EXTFS.Length+4], ecx |
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113 | |||
114 | ; The disk field. |
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115 | mov ecx, [ebp + PARTITION.Disk] |
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116 | mov [eax + EXTFS.Disk], ecx |
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117 | |||
118 | mov [eax + EXTFS.FSUserFunctions], ext2_user_functions |
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119 | |||
120 | push ebp esi edi |
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121 | |||
122 | mov ebp, eax |
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123 | lea ecx, [eax + EXTFS.lock] |
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124 | call mutex_init |
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125 | |||
126 | ; Copy superblock from buffer to reserved memory. |
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127 | mov esi, ebx |
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128 | lea edi, [ebp + EXTFS.superblock] |
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129 | mov ecx, 512/4 |
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130 | rep movsd |
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131 | |||
132 | ; Get total groups. |
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133 | mov eax, [ebx + EXT2_SB_STRUC.blocks_count] |
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134 | sub eax, [ebx + EXT2_SB_STRUC.first_data_block] |
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135 | dec eax |
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136 | xor edx, edx |
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137 | div [ebx + EXT2_SB_STRUC.blocks_per_group] |
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138 | inc eax |
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139 | mov [ebp + EXTFS.groups_count], eax |
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140 | |||
141 | ; Get log(block_size), such that 1,2,3,4 equ 1KiB,2KiB,4KiB,8KiB. |
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142 | mov ecx, [ebx + EXT2_SB_STRUC.log_block_size] |
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143 | inc ecx |
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144 | mov [ebp + EXTFS.log_block_size], ecx |
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145 | |||
146 | ; 512-byte blocks in ext2 blocks. |
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147 | mov eax, 1 |
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148 | shl eax, cl |
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149 | mov [ebp + EXTFS.count_block_in_block], eax |
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150 | |||
151 | ; Get block_size/4 (we'll find square later). |
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152 | shl eax, 7 |
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153 | mov [ebp + EXTFS.count_pointer_in_block], eax |
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154 | mov edx, eax |
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155 | |||
156 | ; Get block size. |
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157 | shl eax, 2 |
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158 | mov [ebp + EXTFS.block_size], eax |
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159 | |||
160 | ; Save block size for 2 kernel_alloc calls. |
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161 | push eax eax |
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162 | |||
163 | mov eax, edx |
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164 | mul edx |
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165 | mov [ebp + EXTFS.count_pointer_in_block_square], eax |
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166 | |||
167 | ; Have temporary block storage for get_inode procedure, and one for global procedure. |
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168 | KERNEL_ALLOC [ebp + EXTFS.ext2_save_block], .error |
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169 | KERNEL_ALLOC [ebp + EXTFS.ext2_temp_block], .error |
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170 | |||
171 | mov [ebp + EXTFS.partition_flags], 0x00000000 |
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172 | mov eax, [ebx + EXT2_SB_STRUC.feature_ro_compat] |
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173 | and eax, not EXT2_FEATURE_RO_COMPAT_SUPP |
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174 | jnz .read_only |
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175 | |||
176 | mov eax, [ebx + EXT2_SB_STRUC.feature_incompat] |
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177 | and eax, EXT4_FEATURE_INCOMPAT_W_NOT_SUPP |
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178 | jz @F |
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179 | |||
180 | .read_only: |
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181 | ; Mark as read-only. |
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182 | or [ebp + EXTFS.partition_flags], EXT2_RO |
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183 | @@: |
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184 | mov ecx, [ebx + EXT2_SB_STRUC.blocks_per_group] |
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185 | mov [ebp + EXTFS.blocks_per_group], ecx |
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186 | |||
187 | movzx ecx, word[ebx + EXT2_SB_STRUC.inode_size] |
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188 | mov [ebp + EXTFS.inode_size], ecx |
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189 | |||
190 | ; Allocate for three inodes (loop would be overkill). |
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191 | push ecx ecx ecx |
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192 | |||
193 | KERNEL_ALLOC [ebp + EXTFS.ext2_save_inode], .error |
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194 | KERNEL_ALLOC [ebp + EXTFS.ext2_temp_inode], .error |
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195 | KERNEL_ALLOC [ebp + EXTFS.root_inode], .error |
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196 | |||
197 | ; Read root inode. |
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198 | mov ebx, eax |
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199 | mov eax, EXT2_ROOT_INO |
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200 | call ext2_inode_read |
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201 | |||
202 | test eax, eax |
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203 | jnz .error |
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204 | |||
205 | ;call ext2_sb_update |
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206 | ; Sync the disk. |
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207 | ;mov esi, [ebp + PARTITION.Disk] |
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208 | ;call disk_sync ; eax contains error code, if any. |
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209 | |||
210 | mov eax, ebp ; Return pointer to EXTFS. |
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211 | pop edi esi ebp ebx |
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212 | ret |
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213 | |||
214 | ; Error in setting up. |
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215 | .error: |
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216 | ; Free save block. |
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217 | KERNEL_FREE [ebp + EXTFS.ext2_save_block], .fail |
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218 | |||
219 | ; Temporary block. |
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220 | KERNEL_FREE [ebp + EXTFS.ext2_temp_block], .fail |
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221 | |||
222 | ; All inodes. |
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223 | KERNEL_FREE [ebp + EXTFS.ext2_save_inode], .fail |
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224 | KERNEL_FREE [ebp + EXTFS.ext2_temp_inode], .fail |
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225 | KERNEL_FREE [ebp + EXTFS.root_inode], .fail |
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226 | |||
227 | mov eax, ebp |
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228 | call free |
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229 | |||
230 | jmp .fail |
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231 | endp |
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232 | |||
233 | ; FUNCTIONS PROVIDED BY SYSCALLS. |
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234 | |||
235 | ;--------------------------------------------------------------------- |
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236 | ; Frees up all ext2 structures. |
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237 | ; Input: eax = pointer to EXTFS. |
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238 | ;--------------------------------------------------------------------- |
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239 | proc ext2_free |
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240 | push ebp |
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241 | |||
242 | xchg ebp, eax |
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243 | stdcall kernel_free, [ebp+EXTFS.ext2_save_block] |
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244 | stdcall kernel_free, [ebp+EXTFS.ext2_temp_block] |
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245 | stdcall kernel_free, [ebp+EXTFS.ext2_save_inode] |
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246 | stdcall kernel_free, [ebp+EXTFS.ext2_temp_inode] |
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247 | stdcall kernel_free, [ebp+EXTFS.root_inode] |
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248 | |||
249 | xchg ebp, eax |
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250 | call free |
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251 | |||
252 | pop ebp |
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253 | ret |
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254 | endp |
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255 | |||
256 | ;--------------------------------------------------------------------- |
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257 | ; Read disk folder. |
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258 | ; Input: ebp = pointer to EXTFS structure. |
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259 | ; esi + [esp + 4] = file name. |
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260 | ; ebx = pointer to parameters from sysfunc 70. |
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261 | ; Output: ebx = blocks read (or 0xFFFFFFFF, folder not found) |
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262 | ; eax = error code (0 implies no error) |
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263 | ;--------------------------------------------------------------------- |
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264 | ext2_ReadFolder: |
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265 | ;DEBUGF 1, "Reading folder.\n" |
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266 | call ext2_lock |
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267 | cmp byte [esi], 0 |
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268 | jz .root_folder |
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269 | |||
270 | push ebx |
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271 | stdcall ext2_inode_find, [esp + 4 + 4] ; Get inode. |
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272 | pop ebx |
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273 | |||
274 | mov esi, [ebp + EXTFS.ext2_save_inode] |
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275 | test eax, eax |
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276 | jnz .error_ret |
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277 | |||
278 | ; If not a directory, then return with error. |
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279 | test [esi + EXT2_INODE_STRUC.i_mode], EXT2_S_IFDIR |
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280 | jz .error_not_found |
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281 | jmp @F |
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282 | |||
283 | .root_folder: |
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284 | mov esi, [ebp + EXTFS.root_inode] |
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285 | test [esi + EXT2_INODE_STRUC.i_mode], EXT2_S_IFDIR |
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286 | jz .error_root |
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287 | |||
288 | ; Copy the inode. |
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289 | mov edi, [ebp + EXTFS.ext2_save_inode] |
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290 | mov ecx, [ebp + EXTFS.inode_size] |
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291 | shr ecx, 2 |
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292 | |||
293 | push edi |
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294 | rep movsd |
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295 | pop esi |
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296 | |||
297 | @@: |
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298 | cmp [esi + EXT2_INODE_STRUC.i_size], 0 ; Folder is empty. |
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299 | je .error_empty_dir |
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300 | |||
301 | mov edx, [ebx + 16] |
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302 | push edx ; Result address [edi + 28]. |
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303 | push 0 ; End of the current block in folder [edi + 24] |
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304 | push dword[ebx + 12] ; Blocks to read [edi + 20] |
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305 | push dword[ebx + 4] ; The first wanted file [edi + 16] |
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306 | push dword[ebx + 8] ; Flags [edi + 12] |
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307 | push 0 ; Read files [edi + 8] |
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308 | push 0 ; Files in folder [edi + 4] |
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309 | push 0 ; Number of blocks read in dir (and current block index) [edi] |
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310 | |||
311 | ; Fill header with zeroes. |
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312 | mov edi, edx |
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313 | mov ecx, 32/4 |
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314 | rep stosd |
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315 | |||
316 | mov edi, esp ; edi = pointer to local variables. |
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317 | add edx, 32 ; edx = mem to return. |
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318 | |||
319 | xor ecx, ecx ; Get number of first block. |
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320 | call ext2_inode_get_block |
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321 | test eax, eax |
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322 | jnz .error_get_block |
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323 | |||
324 | mov eax, ecx |
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325 | mov ebx, [ebp + EXTFS.ext2_save_block] |
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326 | call ext2_block_read ; Read the block. |
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327 | test eax, eax |
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328 | jnz .error_get_block |
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329 | |||
330 | mov eax, ebx ; esi: current directory record |
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331 | add eax, [ebp + EXTFS.block_size] |
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332 | |||
333 | mov [edi + 24], eax |
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334 | |||
335 | mov ecx, [edi + 16] ; ecx = first wanted (flags ommited) |
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336 | |||
337 | .find_wanted_start: |
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338 | jecxz .find_wanted_end |
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339 | |||
340 | .find_wanted_cycle: |
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341 | cmp [ebx + EXT2_DIR_STRUC.inode], 0 ; Don't count unused inode in total files. |
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342 | jz @F |
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343 | |||
344 | inc dword [edi + 4] ; EXT2 files in folder. |
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345 | dec ecx |
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346 | @@: |
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347 | movzx eax, [ebx + EXT2_DIR_STRUC.rec_len] |
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348 | |||
349 | cmp eax, 12 ; Minimum record length. |
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350 | jb .error_bad_len |
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351 | test eax, 0x3 ; Record length must be divisible by four. |
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352 | jnz .error_bad_len |
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353 | |||
354 | sub [esi + EXT2_INODE_STRUC.i_size], eax ; Subtract "processed record" length directly from inode. |
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355 | add ebx, eax ; Go to next record. |
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356 | cmp ebx, [edi + 24] ; If not reached the next block, continue. |
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357 | jb .find_wanted_start |
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358 | |||
359 | push .find_wanted_start |
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360 | .end_block: ; Get the next block. |
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361 | cmp [esi + EXT2_INODE_STRUC.i_size], 0 |
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362 | jle .end_dir |
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363 | |||
364 | inc dword [edi] ; Number of blocks read. |
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365 | |||
366 | ; Read the next block. |
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367 | push ecx |
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368 | mov ecx, [edi] |
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369 | call ext2_inode_get_block |
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370 | test eax, eax |
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371 | jnz .error_get_block |
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372 | |||
373 | mov eax, ecx |
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374 | mov ebx, [ebp + EXTFS.ext2_save_block] |
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375 | call ext2_block_read |
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376 | test eax, eax |
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377 | jnz .error_get_block |
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378 | pop ecx |
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379 | |||
380 | mov eax, ebx |
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381 | add eax, [ebp + EXTFS.block_size] |
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382 | mov [edi + 24], eax ; Update the end of the current block variable. |
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383 | ret |
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384 | |||
385 | .wanted_end: |
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386 | loop .find_wanted_cycle ; Skip files till we reach wanted one. |
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387 | |||
388 | ; First requisite file. |
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389 | .find_wanted_end: |
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390 | mov ecx, [edi + 20] |
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391 | .wanted_start: ; Look for first_wanted + count. |
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392 | jecxz .wanted_end |
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393 | |||
394 | cmp [ebx + EXT2_DIR_STRUC.inode], 0 ; if (inode == 0): not used; |
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395 | jz .empty_rec |
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396 | |||
397 | ; Increment "files in dir" and "read files" count. |
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398 | inc dword [edi + 8] |
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399 | inc dword [edi + 4] |
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400 | |||
401 | push edi ecx |
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402 | mov edi, edx ; Zero out till the name field. |
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403 | xor eax, eax |
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404 | mov ecx, 40 / 4 |
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405 | rep stosd |
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406 | pop ecx edi |
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407 | |||
408 | push ebx edi edx |
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409 | mov eax, [ebx + EXT2_DIR_STRUC.inode] ; Get the child inode. |
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410 | mov ebx, [ebp + EXTFS.ext2_temp_inode] |
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411 | call ext2_inode_read |
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412 | test eax, eax |
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413 | jnz .error_read_subinode |
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414 | |||
415 | lea edi, [edx + 8] |
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416 | |||
417 | mov eax, [ebx + EXT2_INODE_STRUC.i_ctime] ; Convert time in NTFS format. |
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418 | xor edx, edx |
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419 | add eax, 3054539008 ; (369 * 365 + 89) * 24 * 3600 |
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420 | adc edx, 2 |
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421 | call ntfs_datetime_to_bdfe.sec |
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422 | |||
423 | mov eax, [ebx + EXT2_INODE_STRUC.i_atime] |
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424 | xor edx, edx |
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425 | add eax, 3054539008 |
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426 | adc edx, 2 |
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427 | call ntfs_datetime_to_bdfe.sec |
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428 | |||
429 | mov eax, [ebx + EXT2_INODE_STRUC.i_mtime] |
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430 | xor edx, edx |
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431 | add eax, 3054539008 |
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432 | adc edx, 2 |
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433 | call ntfs_datetime_to_bdfe.sec |
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434 | |||
435 | pop edx |
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436 | test [ebx + EXT2_INODE_STRUC.i_mode], EXT2_S_IFDIR ; If folder, don't report size. |
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437 | jnz @F |
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438 | |||
439 | mov eax, [ebx + EXT2_INODE_STRUC.i_size] ; Low size |
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440 | stosd |
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441 | mov eax, [ebx + EXT2_INODE_STRUC.i_dir_acl] ; High size |
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442 | stosd |
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443 | |||
444 | xor dword [edx], FS_FT_DIR ; Mark as file. |
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445 | @@: |
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446 | xor dword [edx], FS_FT_DIR ; Mark as directory. |
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447 | |||
448 | ; Copy name after converting from UTF-8 to CP866. |
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449 | push ecx esi |
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450 | mov esi, [esp + 12] |
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451 | movzx ecx, [esi + EXT2_DIR_STRUC.name_len] |
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452 | lea edi, [edx + 40] |
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453 | lea esi, [esi + EXT2_DIR_STRUC.name] |
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454 | call utf8_to_cp866 |
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455 | and byte [edi], 0 |
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456 | pop esi ecx edi ebx |
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457 | |||
458 | cmp byte [edx + 40], '.' ; If it begins with ".", mark it as hidden. |
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459 | jne @F |
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460 | or dword [edx], FS_FT_HIDDEN |
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461 | |||
462 | @@: |
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463 | add edx, 40 + 264 ; Go to next record. |
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464 | dec ecx |
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465 | .empty_rec: |
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466 | movzx eax, [ebx + EXT2_DIR_STRUC.rec_len] |
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467 | |||
468 | cmp eax, 12 ; Illegal length. |
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469 | jb .error_bad_len |
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470 | test eax, 0x3 ; Not a multiple of four. |
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471 | jnz .error_bad_len |
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472 | |||
473 | sub [esi + EXT2_INODE_STRUC.i_size], eax ; Subtract directly from the inode. |
||
474 | add ebx, eax |
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475 | cmp ebx, [edi + 24] ; Are we at the end of the block? |
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476 | jb .wanted_start |
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477 | |||
478 | push .wanted_start |
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479 | jmp .end_block |
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480 | |||
481 | .end_dir: ; End of the directory. |
||
482 | call ext2_unlock |
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483 | mov edx, [edi + 28] ; Address of where to return data. |
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484 | mov ebx, [edi + 8] ; EXT2_read_in_folder |
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485 | mov ecx, [edi + 4] ; EXT2_files_in_folder |
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486 | mov dword [edx], 1 ; Version |
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487 | mov [edx + 4], ebx |
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488 | mov [edx + 8], ecx |
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489 | |||
490 | lea esp, [edi + 32] |
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491 | |||
492 | xor eax, eax ; Reserved in current implementation. |
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493 | lea edi, [edx + 12] |
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494 | mov ecx, 20 / 4 |
||
495 | rep stosd |
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496 | |||
497 | ;DEBUGF 1, "Returning with: %x.\n", eax |
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498 | ret |
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499 | |||
500 | .error_bad_len: |
||
501 | mov eax, ERROR_FS_FAIL |
||
502 | |||
503 | .error_read_subinode: |
||
504 | .error_get_block: |
||
505 | ; Fix the stack. |
||
506 | lea esp, [edi + 32] |
||
507 | |||
508 | .error_ret: |
||
509 | or ebx, -1 |
||
510 | push eax |
||
511 | call ext2_unlock |
||
512 | pop eax |
||
513 | ;DEBUGF 1, "Returning with: %x.\n", eax |
||
514 | ret |
||
515 | |||
516 | .error_empty_dir: ; inode of folder without blocks. |
||
517 | .error_root: ; Root has to be a folder. |
||
518 | mov eax, ERROR_FS_FAIL |
||
519 | jmp .error_ret |
||
520 | |||
521 | .error_not_found: ; Directory not found. |
||
522 | mov eax, ERROR_FILE_NOT_FOUND |
||
523 | jmp .error_ret |
||
524 | |||
525 | ;--------------------------------------------------------------------- |
||
526 | ; Read file from the hard disk. |
||
527 | ; Input: esi + [esp + 4] = points to file name. |
||
528 | ; ebx = pointer to paramteres from sysfunc 70. |
||
529 | ; ebp = pointer to EXTFS structure. |
||
530 | ; Output: ebx = bytes read (0xFFFFFFFF -> file not found) |
||
531 | ; eax = error code (0 implies no error) |
||
532 | ;--------------------------------------------------------------------- |
||
533 | ext2_Read: |
||
534 | ;DEBUGF 1, "Attempting read.\n" |
||
535 | call ext2_lock |
||
536 | cmp byte [esi], 0 |
||
537 | jnz @F |
||
538 | |||
539 | .this_is_nofile: |
||
540 | call ext2_unlock |
||
541 | or ebx, -1 |
||
542 | mov eax, ERROR_ACCESS_DENIED |
||
543 | ret |
||
544 | |||
545 | @@: |
||
546 | push ebx |
||
547 | stdcall ext2_inode_find, [esp + 4 + 4] |
||
548 | pop ebx |
||
549 | |||
550 | mov esi, [ebp + EXTFS.ext2_save_inode] |
||
551 | test eax, eax |
||
552 | jz @F |
||
553 | |||
554 | call ext2_unlock |
||
555 | or ebx, -1 |
||
556 | mov eax, ERROR_FILE_NOT_FOUND |
||
557 | ret |
||
558 | |||
559 | @@: |
||
560 | mov ax, [esi + EXT2_INODE_STRUC.i_mode] |
||
561 | and ax, EXT2_S_IFMT ; Leave the file format in AX. |
||
562 | |||
563 | ; Check if file. |
||
564 | cmp ax, EXT2_S_IFREG |
||
565 | jne .this_is_nofile |
||
566 | |||
567 | mov edi, [ebx + 16] |
||
568 | mov ecx, [ebx + 12] |
||
569 | |||
570 | mov eax, [ebx + 4] |
||
571 | mov edx, [ebx + 8] ; edx:eax = start byte number. |
||
572 | |||
573 | ; Check if file is big enough for us. |
||
574 | cmp [esi + EXT2_INODE_STRUC.i_dir_acl], edx |
||
575 | ja .size_greater |
||
576 | jb .size_less |
||
577 | |||
578 | cmp [esi + EXT2_INODE_STRUC.i_size], eax |
||
579 | ja .size_greater |
||
580 | |||
581 | .size_less: |
||
582 | call ext2_unlock |
||
583 | xor ebx, ebx |
||
584 | mov eax, ERROR_END_OF_FILE |
||
585 | ret |
||
586 | |||
587 | @@: |
||
588 | .size_greater: |
||
589 | add eax, ecx ; Get last byte. |
||
590 | adc edx, 0 |
||
591 | |||
592 | ; Check if we've to read whole file, or till requested. |
||
593 | cmp [esi + EXT2_INODE_STRUC.i_dir_acl], edx |
||
594 | ja .read_till_requested |
||
595 | jb .read_whole_file |
||
596 | cmp [esi + EXT2_INODE_STRUC.i_size], eax |
||
597 | jae .read_till_requested |
||
598 | |||
599 | .read_whole_file: |
||
600 | push 1 ; Read till the end of file. |
||
601 | mov ecx, [esi + EXT2_INODE_STRUC.i_size] |
||
602 | sub ecx, [ebx + 4] ; To read = (size - starting byte) |
||
603 | jmp @F |
||
604 | |||
605 | .read_till_requested: |
||
606 | push 0 ; Read as much as requested. |
||
607 | |||
608 | @@: |
||
609 | ; ecx = bytes to read. |
||
610 | ; edi = return memory |
||
611 | ; [esi] = starting byte. |
||
612 | |||
613 | push ecx ; Number of bytes to read. |
||
614 | |||
615 | ; Get part of the first block. |
||
616 | mov edx, [ebx + 8] |
||
617 | mov eax, [ebx + 4] |
||
618 | div [ebp + EXTFS.block_size] |
||
619 | |||
620 | push eax ; Save block counter to stack. |
||
621 | |||
622 | push ecx |
||
623 | mov ecx, eax |
||
624 | call ext2_inode_get_block |
||
625 | test eax, eax |
||
626 | jnz .error_at_first_block |
||
627 | |||
628 | mov ebx, [ebp + EXTFS.ext2_save_block] |
||
629 | mov eax, ecx |
||
630 | call ext2_block_read |
||
631 | test eax, eax |
||
632 | jnz .error_at_first_block |
||
633 | |||
634 | pop ecx |
||
635 | ; Get index inside block. |
||
636 | add ebx, edx |
||
637 | |||
638 | neg edx |
||
639 | add edx, [ebp + EXTFS.block_size] ; Get number of bytes in this block. |
||
640 | |||
641 | ; If it's smaller than total bytes to read, then only one block. |
||
642 | cmp ecx, edx |
||
643 | jbe .only_one_block |
||
644 | |||
645 | mov eax, ecx |
||
646 | sub eax, edx |
||
647 | mov ecx, edx |
||
648 | |||
649 | push esi |
||
650 | mov esi, ebx |
||
651 | rep movsb ; Copy part of 1st block. |
||
652 | pop esi |
||
653 | |||
654 | ; eax -> bytes to read. |
||
655 | .calc_blocks_count: |
||
656 | mov ebx, edi ; Read the block in ebx. |
||
657 | xor edx, edx |
||
658 | div [ebp + EXTFS.block_size] ; Get number of bytes in last block in edx. |
||
659 | mov edi, eax ; Get number of blocks in edi. |
||
660 | |||
661 | @@: |
||
662 | ; Test if all blocks are done. |
||
663 | test edi, edi |
||
664 | jz .finish_block |
||
665 | |||
666 | inc dword [esp] |
||
667 | mov ecx, [esp] |
||
668 | call ext2_inode_get_block |
||
669 | |||
670 | test eax, eax |
||
671 | jnz .error_at_read_cycle |
||
672 | |||
673 | mov eax, ecx ; ebx already contains desired values. |
||
674 | call ext2_block_read |
||
675 | |||
676 | test eax, eax |
||
677 | jnz .error_at_read_cycle |
||
678 | |||
679 | add ebx, [ebp + EXTFS.block_size] |
||
680 | |||
681 | dec edi |
||
682 | jmp @B |
||
683 | |||
684 | ; In edx -- number of bytes in the last block. |
||
685 | .finish_block: |
||
686 | test edx, edx |
||
687 | jz .end_read |
||
688 | |||
689 | pop ecx ; Pop block counter in ECX. |
||
690 | inc ecx |
||
691 | call ext2_inode_get_block |
||
692 | |||
693 | test eax, eax |
||
694 | jnz .error_at_finish_block |
||
695 | |||
696 | mov edi, ebx |
||
697 | mov eax, ecx |
||
698 | mov ebx, [ebp + EXTFS.ext2_save_block] |
||
699 | call ext2_block_read |
||
700 | |||
701 | test eax, eax |
||
702 | jnz .error_at_finish_block |
||
703 | |||
704 | mov ecx, edx |
||
705 | mov esi, ebx |
||
706 | rep movsb ; Copy last piece of block. |
||
707 | jmp @F |
||
708 | |||
709 | .end_read: |
||
710 | pop ecx ; Pop block counter in ECX. |
||
711 | @@: |
||
712 | pop ebx ; Number of bytes read. |
||
713 | call ext2_unlock |
||
714 | pop eax ; If we were asked to read more, say EOF. |
||
715 | test eax, eax |
||
716 | jz @F |
||
717 | |||
718 | mov eax, ERROR_END_OF_FILE |
||
719 | ret |
||
720 | @@: |
||
721 | xor eax, eax |
||
722 | ;DEBUGF 1, "Returning with: %x.\n", eax |
||
723 | ret |
||
724 | |||
725 | .only_one_block: |
||
726 | mov esi, ebx |
||
727 | rep movsb ; Copy last piece of block. |
||
728 | jmp .end_read |
||
729 | |||
730 | .error_at_first_block: |
||
731 | pop edx |
||
732 | .error_at_read_cycle: |
||
733 | pop ebx |
||
734 | .error_at_finish_block: |
||
735 | pop ecx edx |
||
736 | or ebx, -1 |
||
737 | push eax |
||
738 | call ext2_unlock |
||
739 | pop eax |
||
740 | |||
741 | ;DEBUGF 1, "Returning with: %x.\n", eax |
||
742 | ret |
||
743 | |||
744 | ;--------------------------------------------------------------------- |
||
745 | ; Read file information from block device. |
||
746 | ; Input: esi + [esp + 4] = file name. |
||
747 | ; ebx = pointer to paramteres from sysfunc 70. |
||
748 | ; ebp = pointer to EXTFS structure. |
||
749 | ; Output: eax = error code. |
||
750 | ;--------------------------------------------------------------------- |
||
751 | ext2_GetFileInfo: |
||
752 | ;DEBUGF 1, "Calling for file info, for: %s.\n", esi |
||
753 | call ext2_lock |
||
754 | mov edx, [ebx + 16] |
||
755 | cmp byte [esi], 0 |
||
756 | jz .is_root |
||
757 | |||
758 | push edx |
||
759 | stdcall ext2_inode_find, [esp + 4 + 4] |
||
760 | mov ebx, edx |
||
761 | pop edx |
||
762 | |||
763 | mov esi, [ebp + EXTFS.ext2_save_inode] |
||
764 | test eax, eax |
||
765 | jz @F |
||
766 | |||
767 | push eax |
||
768 | call ext2_unlock |
||
769 | pop eax |
||
770 | ;DEBUGF 1, "Returning with: %x.\n", eax |
||
771 | ret |
||
772 | |||
773 | .is_root: |
||
774 | xor ebx, ebx ; Clear out first char, since we don't want to set hidden flag on root. |
||
775 | mov esi, [ebp + EXTFS.root_inode] |
||
776 | |||
777 | @@: |
||
778 | xor eax, eax |
||
779 | mov edi, edx |
||
780 | mov ecx, 40/4 |
||
781 | rep stosd ; Zero fill buffer. |
||
782 | |||
783 | cmp bl, '.' |
||
784 | jne @F |
||
785 | or dword [edx], FS_FT_HIDDEN |
||
786 | |||
787 | @@: |
||
788 | test [esi + EXT2_INODE_STRUC.i_mode], EXT2_S_IFDIR |
||
789 | jnz @F ; If a directory, don't put in file size. |
||
790 | |||
791 | mov eax, [esi + EXT2_INODE_STRUC.i_size] ; Low file size. |
||
792 | mov ebx, [esi + EXT2_INODE_STRUC.i_dir_acl] ; High file size. |
||
793 | mov dword [edx+32], eax |
||
794 | mov dword [edx+36], ebx |
||
795 | |||
796 | xor dword [edx], FS_FT_DIR ; Next XOR will clean this, to mark it as a file. |
||
797 | @@: |
||
798 | xor dword [edx], FS_FT_DIR ; Mark as directory. |
||
799 | |||
800 | lea edi, [edx + 8] |
||
801 | |||
802 | ; Store all time. |
||
803 | mov eax, [esi + EXT2_INODE_STRUC.i_ctime] |
||
804 | xor edx, edx |
||
805 | add eax, 3054539008 |
||
806 | adc edx, 2 |
||
807 | call ntfs_datetime_to_bdfe.sec |
||
808 | |||
809 | mov eax, [esi + EXT2_INODE_STRUC.i_atime] |
||
810 | xor edx, edx |
||
811 | add eax, 3054539008 |
||
812 | adc edx, 2 |
||
813 | call ntfs_datetime_to_bdfe.sec |
||
814 | |||
815 | mov eax, [esi + EXT2_INODE_STRUC.i_mtime] |
||
816 | xor edx, edx |
||
817 | add eax, 3054539008 |
||
818 | adc edx, 2 |
||
819 | call ntfs_datetime_to_bdfe.sec |
||
820 | |||
821 | call ext2_unlock |
||
822 | xor eax, eax |
||
823 | ;DEBUGF 1, "Returning with: %x.\n", eax |
||
824 | ret |
||
825 | |||
826 | ;--------------------------------------------------------------------- |
||
827 | ; Set file information for block device. |
||
828 | ; Input: esi + [esp + 4] = file name. |
||
829 | ; ebx = pointer to paramteres from sysfunc 70. |
||
830 | ; ebp = pointer to EXTFS structure. |
||
831 | ; Output: eax = error code. |
||
832 | ;--------------------------------------------------------------------- |
||
833 | ext2_SetFileInfo: |
||
834 | test [ebp + EXTFS.partition_flags], EXT2_RO |
||
835 | jz @F |
||
836 | |||
837 | mov eax, ERROR_UNSUPPORTED_FS |
||
838 | ret |
||
839 | |||
840 | @@: |
||
841 | push edx esi edi ebx |
||
842 | call ext2_lock |
||
843 | mov edx, [ebx + 16] |
||
844 | |||
845 | ; Is this read-only? |
||
846 | test [ebp + EXTFS.partition_flags], EXT2_RO |
||
847 | jnz .fail |
||
848 | |||
849 | ; Not supported for root. |
||
850 | cmp byte [esi], 0 |
||
851 | je .fail |
||
852 | |||
853 | .get_inode: |
||
854 | push edx |
||
855 | stdcall ext2_inode_find, [esp + 4 + 20] |
||
856 | pop edx |
||
857 | |||
858 | test eax, eax |
||
859 | jnz @F |
||
860 | |||
861 | ; Save inode number. |
||
862 | push esi |
||
863 | mov esi, [ebp + EXTFS.ext2_save_inode] |
||
864 | |||
865 | ; From the BDFE, we ignore read-only file flags, hidden file flags; |
||
866 | ; We ignore system file flags, file was archived or not. |
||
867 | |||
868 | ; Also ignored is file creation time. ext2 stores "inode modification" |
||
869 | ; time in the ctime field, which is updated by the respective inode_write |
||
870 | ; procedure, and any writes on it would be overwritten anyway. |
||
871 | |||
872 | ; Access time. |
||
873 | lea edi, [esi + EXT2_INODE_STRUC.i_atime] |
||
874 | lea esi, [edx + 16] |
||
875 | call bdfe_to_unix_time |
||
876 | |||
877 | ; Modification time. |
||
878 | add esi, 8 |
||
879 | add edi, 8 |
||
880 | call bdfe_to_unix_time |
||
881 | |||
882 | mov ebx, [ebp + EXTFS.ext2_save_inode] ; Get address of inode into ebx. |
||
883 | pop eax ; Get inode number in eax. |
||
884 | call ext2_inode_write ; eax contains error code, if any. |
||
885 | test eax, eax |
||
886 | jnz @F |
||
887 | |||
888 | call ext2_sb_update |
||
889 | ; Sync the disk. |
||
890 | mov esi, [ebp + PARTITION.Disk] |
||
891 | call disk_sync ; eax contains error code, if any. |
||
892 | |||
893 | @@: |
||
894 | push eax |
||
895 | call ext2_unlock |
||
896 | pop eax |
||
897 | |||
898 | pop ebx edi esi edx |
||
899 | ret |
||
900 | |||
901 | .fail: |
||
902 | call ext2_sb_update |
||
903 | ; Sync the disk. |
||
904 | mov esi, [ebp + PARTITION.Disk] |
||
905 | call disk_sync ; eax contains error code, if any. |
||
906 | |||
907 | mov eax, ERROR_UNSUPPORTED_FS |
||
908 | jmp @B |
||
909 | |||
910 | ;--------------------------------------------------------------------- |
||
911 | ; Set file information for block device. |
||
912 | ; Input: esi + [esp + 4] = file name. |
||
913 | ; ebx = pointer to paramteres from sysfunc 70. |
||
914 | ; ebp = pointer to EXTFS structure. |
||
915 | ; Output: eax = error code. |
||
916 | ;--------------------------------------------------------------------- |
||
917 | ext2_Delete: |
||
918 | ;DEBUGF 1, "Attempting Delete.\n" |
||
919 | test [ebp + EXTFS.partition_flags], EXT2_RO |
||
920 | jz @F |
||
921 | |||
922 | mov eax, ERROR_UNSUPPORTED_FS |
||
923 | ret |
||
924 | |||
925 | @@: |
||
926 | push ebx ecx edx esi edi |
||
927 | call ext2_lock |
||
928 | |||
929 | add esi, [esp + 20 + 4] |
||
930 | |||
931 | ; Can't delete root. |
||
932 | cmp byte [esi], 0 |
||
933 | jz .error_access_denied |
||
934 | |||
935 | push esi |
||
936 | stdcall ext2_inode_find, 0 |
||
937 | mov ebx, esi |
||
938 | pop esi |
||
939 | |||
940 | test eax, eax |
||
941 | jnz .error_access_denied |
||
942 | |||
943 | mov edx, [ebp + EXTFS.ext2_save_inode] |
||
944 | movzx edx, [edx + EXT2_INODE_STRUC.i_mode] |
||
945 | and edx, EXT2_S_IFMT ; Get the mask. |
||
946 | cmp edx, EXT2_S_IFDIR |
||
947 | jne @F ; If not a directory, we don't need to check if it's empty. |
||
948 | |||
949 | call ext2_dir_empty ; 0 means directory is empty. |
||
950 | |||
951 | test eax, eax |
||
952 | jnz .error_access_denied |
||
953 | |||
954 | @@: |
||
955 | ; Find parent. |
||
956 | call ext2_inode_find_parent |
||
957 | test eax, eax |
||
958 | jnz .error_access_denied |
||
959 | mov eax, esi |
||
960 | |||
961 | ; Save file/dir & parent inode. |
||
962 | push ebx eax |
||
963 | |||
964 | cmp edx, EXT2_S_IFDIR |
||
965 | jne @F |
||
966 | |||
967 | ; Unlink '.' |
||
968 | mov eax, [esp + 4] |
||
969 | call ext2_inode_unlink |
||
970 | cmp eax, 0xFFFFFFFF |
||
971 | je .error_stack8 |
||
972 | |||
973 | ; Unlink '..' |
||
974 | mov eax, [esp + 4] |
||
975 | mov ebx, [esp] |
||
976 | call ext2_inode_unlink |
||
977 | cmp eax, 0xFFFFFFFF |
||
978 | je .error_stack8 |
||
979 | |||
980 | @@: |
||
981 | pop eax |
||
982 | mov ebx, [esp] |
||
983 | ; Unlink the inode. |
||
984 | call ext2_inode_unlink |
||
985 | cmp eax, 0xFFFFFFFF |
||
986 | je .error_stack4 |
||
987 | |||
988 | ; If hardlinks aren't zero, shouldn't completely free. |
||
989 | test eax, eax |
||
990 | jz @F |
||
991 | |||
992 | add esp, 4 |
||
993 | jmp .disk_sync |
||
994 | |||
995 | @@: |
||
996 | ; Read the inode. |
||
997 | mov eax, [esp] |
||
998 | mov ebx, [ebp + EXTFS.ext2_save_inode] |
||
999 | call ext2_inode_read |
||
1000 | test eax, eax |
||
1001 | jnz .error_stack4 |
||
1002 | |||
1003 | ; Free inode data. |
||
1004 | mov esi, [ebp + EXTFS.ext2_save_inode] |
||
1005 | xor ecx, ecx |
||
1006 | |||
1007 | @@: |
||
1008 | push ecx |
||
1009 | call ext2_inode_get_block |
||
1010 | test eax, eax |
||
1011 | jnz .error_stack8 |
||
1012 | mov eax, ecx |
||
1013 | pop ecx |
||
1014 | |||
1015 | ; If 0, we're done. |
||
1016 | test eax, eax |
||
1017 | jz @F |
||
1018 | |||
1019 | call ext2_block_free |
||
1020 | test eax, eax |
||
1021 | jnz .error_stack4 |
||
1022 | |||
1023 | inc ecx |
||
1024 | jmp @B |
||
1025 | |||
1026 | @@: |
||
1027 | ; Free indirect blocks. |
||
1028 | call ext2_inode_free_indirect_blocks |
||
1029 | test eax, eax |
||
1030 | jnz .error_stack4 |
||
1031 | |||
1032 | ; Clear the inode, and add deletion time. |
||
1033 | mov edi, [ebp + EXTFS.ext2_save_inode] |
||
1034 | xor eax, eax |
||
1035 | mov ecx, [ebp + EXTFS.inode_size] |
||
1036 | rep stosb |
||
1037 | |||
1038 | mov edi, [ebp + EXTFS.ext2_save_inode] |
||
1039 | add edi, EXT2_INODE_STRUC.i_dtime |
||
1040 | call current_unix_time |
||
1041 | |||
1042 | ; Write the inode. |
||
1043 | mov eax, [esp] |
||
1044 | mov ebx, [ebp + EXTFS.ext2_save_inode] |
||
1045 | call ext2_inode_write |
||
1046 | test eax, eax |
||
1047 | jnz .error_stack4 |
||
1048 | |||
1049 | ; Check if directory. |
||
1050 | cmp edx, EXT2_S_IFDIR |
||
1051 | jne @F |
||
1052 | |||
1053 | ; If it is, decrement used_dirs_count. |
||
1054 | |||
1055 | ; Get block group. |
||
1056 | mov eax, [esp] |
||
1057 | dec eax |
||
1058 | xor edx, edx |
||
1059 | div [ebp + EXTFS.superblock + EXT2_SB_STRUC.inodes_per_group] |
||
1060 | |||
1061 | push eax |
||
1062 | call ext2_bg_read_desc |
||
1063 | test eax, eax |
||
1064 | jz .error_stack8 |
||
1065 | |||
1066 | dec [eax + EXT2_BLOCK_GROUP_DESC.used_dirs_count] |
||
1067 | |||
1068 | pop eax |
||
1069 | call ext2_bg_write_desc |
||
1070 | |||
1071 | @@: |
||
1072 | pop eax |
||
1073 | call ext2_inode_free |
||
1074 | test eax, eax |
||
1075 | jnz .error_access_denied |
||
1076 | |||
1077 | .disk_sync: |
||
1078 | call ext2_sb_update |
||
1079 | |||
1080 | ; Sync the disk. |
||
1081 | mov esi, [ebp + PARTITION.Disk] |
||
1082 | call disk_sync ; eax contains error code, if any. |
||
1083 | |||
1084 | .return: |
||
1085 | push eax |
||
1086 | call ext2_unlock |
||
1087 | pop eax |
||
1088 | |||
1089 | pop edi esi edx ecx ebx |
||
1090 | ;DEBUGF 1, "And returning with: %x.\n", eax |
||
1091 | ret |
||
1092 | |||
1093 | .error_stack8: |
||
1094 | add esp, 4 |
||
1095 | .error_stack4: |
||
1096 | add esp, 4 |
||
1097 | .error_access_denied: |
||
1098 | call ext2_sb_update |
||
1099 | |||
1100 | ; Sync the disk. |
||
1101 | mov esi, [ebp + PARTITION.Disk] |
||
1102 | call disk_sync ; eax contains error code, if any. |
||
1103 | |||
1104 | mov eax, ERROR_ACCESS_DENIED |
||
1105 | jmp .return |
||
1106 | |||
1107 | ;--------------------------------------------------------------------- |
||
1108 | ; Set file information for block device. |
||
1109 | ; Input: esi + [esp + 4] = file name. |
||
1110 | ; ebx = pointer to paramteres from sysfunc 70. |
||
1111 | ; ebp = pointer to EXTFS structure. |
||
1112 | ; Output: eax = error code. |
||
1113 | ;--------------------------------------------------------------------- |
||
1114 | ext2_CreateFolder: |
||
1115 | ;DEBUGF 1, "Attempting to create folder.\n" |
||
1116 | test [ebp + EXTFS.partition_flags], EXT2_RO |
||
1117 | jz @F |
||
1118 | |||
1119 | mov eax, ERROR_UNSUPPORTED_FS |
||
1120 | ret |
||
1121 | |||
1122 | @@: |
||
1123 | push ebx ecx edx esi edi |
||
1124 | call ext2_lock |
||
1125 | |||
1126 | add esi, [esp + 20 + 4] |
||
1127 | |||
1128 | ; Can't create root, but for CreateFolder already existing directory is success. |
||
1129 | cmp byte [esi], 0 |
||
1130 | jz .success |
||
1131 | |||
1132 | push esi |
||
1133 | stdcall ext2_inode_find, 0 |
||
1134 | pop esi |
||
1135 | |||
1136 | ; If the directory is there, we've succeeded. |
||
1137 | test eax, eax |
||
1138 | jz .success |
||
1139 | |||
1140 | ; Find parent. |
||
1141 | call ext2_inode_find_parent |
||
1142 | test eax, eax |
||
1143 | jnz .error |
||
1144 | |||
1145 | ; Inode ID for preference. |
||
1146 | mov eax, esi |
||
1147 | call ext2_inode_alloc |
||
1148 | test eax, eax |
||
1149 | jnz .error_full |
||
1150 | |||
1151 | ; Save allocated inode in EDX; filename is in EDI; parent ID in ESI. |
||
1152 | mov edx, ebx |
||
1153 | |||
1154 | push edi |
||
1155 | |||
1156 | xor al, al |
||
1157 | mov edi, [ebp + EXTFS.ext2_temp_inode] |
||
1158 | mov ecx, [ebp + EXTFS.inode_size] |
||
1159 | rep stosb |
||
1160 | |||
1161 | mov edi, [ebp + EXTFS.ext2_temp_inode] |
||
1162 | add edi, EXT2_INODE_STRUC.i_atime |
||
1163 | call current_unix_time |
||
1164 | |||
1165 | add edi, 8 |
||
1166 | call current_unix_time |
||
1167 | |||
1168 | pop edi |
||
1169 | |||
1170 | mov ebx, [ebp + EXTFS.ext2_temp_inode] |
||
1171 | mov [ebx + EXT2_INODE_STRUC.i_mode], EXT2_S_IFDIR or PERMISSIONS |
||
1172 | mov eax, edx |
||
1173 | call ext2_inode_write |
||
1174 | test eax, eax |
||
1175 | jnz .error |
||
1176 | |||
1177 | ; Link to self. |
||
1178 | push edx esi |
||
1179 | |||
1180 | mov eax, edx |
||
1181 | mov ebx, eax |
||
1182 | mov dl, EXT2_FT_DIR |
||
1183 | mov esi, self_link |
||
1184 | call ext2_inode_link |
||
1185 | |||
1186 | pop esi edx |
||
1187 | |||
1188 | test eax, eax |
||
1189 | jnz .error |
||
1190 | |||
1191 | ; Link to parent. |
||
1192 | push edx esi |
||
1193 | |||
1194 | mov eax, ebx |
||
1195 | mov ebx, esi |
||
1196 | mov dl, EXT2_FT_DIR |
||
1197 | mov esi, parent_link |
||
1198 | call ext2_inode_link |
||
1199 | |||
1200 | pop esi edx |
||
1201 | |||
1202 | test eax, eax |
||
1203 | jnz .error |
||
1204 | |||
1205 | ; Link parent to child. |
||
1206 | mov eax, esi |
||
1207 | mov ebx, edx |
||
1208 | mov esi, edi |
||
1209 | mov dl, EXT2_FT_DIR |
||
1210 | call ext2_inode_link |
||
1211 | test eax, eax |
||
1212 | jnz .error |
||
1213 | |||
1214 | ; Get block group descriptor for allocated inode's block. |
||
1215 | mov eax, ebx |
||
1216 | dec eax |
||
1217 | xor edx, edx |
||
1218 | |||
1219 | ; EAX = block group. |
||
1220 | div [ebp + EXTFS.superblock + EXT2_SB_STRUC.inodes_per_group] |
||
1221 | mov edx, eax |
||
1222 | |||
1223 | call ext2_bg_read_desc |
||
1224 | test eax, eax |
||
1225 | jz .error |
||
1226 | |||
1227 | inc [eax + EXT2_BLOCK_GROUP_DESC.used_dirs_count] |
||
1228 | mov eax, edx |
||
1229 | call ext2_bg_write_desc |
||
1230 | test eax, eax |
||
1231 | jnz .error |
||
1232 | |||
1233 | .success: |
||
1234 | call ext2_sb_update |
||
1235 | |||
1236 | ; Sync the disk. |
||
1237 | mov esi, [ebp + PARTITION.Disk] |
||
1238 | call disk_sync ; eax contains error code, if any. |
||
1239 | |||
1240 | .return: |
||
1241 | push eax |
||
1242 | call ext2_unlock |
||
1243 | pop eax |
||
1244 | |||
1245 | pop edi esi edx ecx ebx |
||
1246 | ;DEBUGF 1, "Returning with: %x.\n", eax |
||
1247 | ret |
||
1248 | |||
1249 | .error: |
||
1250 | call ext2_sb_update |
||
1251 | |||
1252 | ; Sync the disk. |
||
1253 | mov esi, [ebp + PARTITION.Disk] |
||
1254 | call disk_sync ; eax contains error code, if any. |
||
1255 | |||
1256 | mov eax, ERROR_ACCESS_DENIED |
||
1257 | jmp .return |
||
1258 | |||
1259 | .error_full: |
||
1260 | mov eax, ERROR_DISK_FULL |
||
1261 | jmp .return |
||
1262 | |||
1263 | self_link db ".", 0 |
||
1264 | parent_link db "..", 0 |
||
1265 | |||
1266 | ;--------------------------------------------------------------------- |
||
1267 | ; Rewrite a file. |
||
1268 | ; Input: esi + [esp + 4] = file name. |
||
1269 | ; ebx = pointer to paramteres from sysfunc 70. |
||
1270 | ; ebp = pointer to EXTFS structure. |
||
1271 | ; Output: eax = error code. |
||
1272 | ; ebx = bytes written. |
||
1273 | ;--------------------------------------------------------------------- |
||
1274 | ext2_Rewrite: |
||
1275 | ;DEBUGF 1, "Attempting Rewrite.\n" |
||
1276 | test [ebp + EXTFS.partition_flags], EXT2_RO |
||
1277 | jz @F |
||
1278 | |||
1279 | mov eax, ERROR_UNSUPPORTED_FS |
||
1280 | ret |
||
1281 | |||
1282 | @@: |
||
1283 | push ecx edx esi edi |
||
1284 | pushad |
||
1285 | |||
1286 | call ext2_lock |
||
1287 | |||
1288 | add esi, [esp + 16 + 32 + 4] |
||
1289 | ; Can't create root. |
||
1290 | cmp byte [esi], 0 |
||
1291 | jz .error_access_denied |
||
1292 | |||
1293 | push esi |
||
1294 | stdcall ext2_inode_find, 0 |
||
1295 | pop esi |
||
1296 | |||
1297 | ; If the file is there, delete it. |
||
1298 | test eax, eax |
||
1299 | jnz @F |
||
1300 | |||
1301 | pushad |
||
1302 | |||
1303 | push eax |
||
1304 | call ext2_unlock |
||
1305 | pop eax |
||
1306 | |||
1307 | push dword 0x00000000 |
||
1308 | call ext2_Delete |
||
1309 | add esp, 4 |
||
1310 | |||
1311 | push eax |
||
1312 | call ext2_lock |
||
1313 | pop eax |
||
1314 | |||
1315 | test eax, eax |
||
1316 | jnz .error_access_denied_delete |
||
1317 | |||
1318 | popad |
||
1319 | @@: |
||
1320 | ; Find parent. |
||
1321 | call ext2_inode_find_parent |
||
1322 | test eax, eax |
||
1323 | jnz .error_access_denied |
||
1324 | |||
1325 | ; Inode ID for preference. |
||
1326 | mov eax, esi |
||
1327 | call ext2_inode_alloc |
||
1328 | test eax, eax |
||
1329 | jnz .error_full |
||
1330 | |||
1331 | ; Save allocated inode in EDX; filename is in EDI; parent ID in ESI. |
||
1332 | mov edx, ebx |
||
1333 | |||
1334 | push edi |
||
1335 | |||
1336 | xor al, al |
||
1337 | mov edi, [ebp + EXTFS.ext2_temp_inode] |
||
1338 | mov ecx, [ebp + EXTFS.inode_size] |
||
1339 | rep stosb |
||
1340 | |||
1341 | mov edi, [ebp + EXTFS.ext2_temp_inode] |
||
1342 | add edi, EXT2_INODE_STRUC.i_atime |
||
1343 | call current_unix_time |
||
1344 | |||
1345 | add edi, 8 |
||
1346 | call current_unix_time |
||
1347 | |||
1348 | pop edi |
||
1349 | |||
1350 | mov ebx, [ebp + EXTFS.ext2_temp_inode] |
||
1351 | mov [ebx + EXT2_INODE_STRUC.i_mode], EXT2_S_IFREG or PERMISSIONS |
||
1352 | mov eax, edx |
||
1353 | call ext2_inode_write |
||
1354 | test eax, eax |
||
1355 | jnz .error |
||
1356 | |||
1357 | ; Link parent to child. |
||
1358 | mov eax, esi |
||
1359 | mov ebx, edx |
||
1360 | mov esi, edi |
||
1361 | mov dl, EXT2_FT_REG_FILE |
||
1362 | call ext2_inode_link |
||
1363 | test eax, eax |
||
1364 | jnz .error |
||
1365 | |||
1366 | popad |
||
1367 | push eax |
||
1368 | call ext2_unlock |
||
1369 | pop eax |
||
1370 | |||
1371 | push dword 0x00000000 |
||
1372 | call ext2_Write |
||
1373 | add esp, 4 |
||
1374 | |||
1375 | push eax |
||
1376 | call ext2_lock |
||
1377 | pop eax |
||
1378 | |||
1379 | .success: |
||
1380 | push eax |
||
1381 | call ext2_sb_update |
||
1382 | |||
1383 | ; Sync the disk. |
||
1384 | mov esi, [ebp + PARTITION.Disk] |
||
1385 | call disk_sync ; eax contains error code, if any. |
||
1386 | pop eax |
||
1387 | |||
1388 | .return: |
||
1389 | push eax |
||
1390 | call ext2_unlock |
||
1391 | pop eax |
||
1392 | |||
1393 | pop edi esi edx ecx |
||
1394 | |||
1395 | ;DEBUGF 1, "And returning with: %x.\n", eax |
||
1396 | ret |
||
1397 | |||
1398 | .error: |
||
1399 | mov eax, ERROR_ACCESS_DENIED |
||
1400 | jmp .success |
||
1401 | |||
1402 | .error_access_denied_delete: |
||
1403 | popad |
||
1404 | |||
1405 | .error_access_denied: |
||
1406 | popad |
||
1407 | xor ebx, ebx |
||
1408 | |||
1409 | mov eax, ERROR_ACCESS_DENIED |
||
1410 | jmp .return |
||
1411 | |||
1412 | .error_full: |
||
1413 | popad |
||
1414 | xor ebx, ebx |
||
1415 | |||
1416 | mov eax, ERROR_DISK_FULL |
||
1417 | jmp .return |
||
1418 | |||
1419 | ;--------------------------------------------------------------------- |
||
1420 | ; Write to a file. |
||
1421 | ; Input: esi + [esp + 4] = file name. |
||
1422 | ; ebx = pointer to paramteres from sysfunc 70. |
||
1423 | ; ebp = pointer to EXTFS structure. |
||
1424 | ; Output: eax = error code. |
||
1425 | ; ebx = number of bytes written. |
||
1426 | ;--------------------------------------------------------------------- |
||
1427 | ext2_Write: |
||
1428 | ;DEBUGF 1, "Attempting write, " |
||
1429 | test [ebp + EXTFS.partition_flags], EXT2_RO |
||
1430 | jz @F |
||
1431 | |||
1432 | mov eax, ERROR_UNSUPPORTED_FS |
||
1433 | ret |
||
1434 | |||
1435 | @@: |
||
1436 | push ecx edx esi edi |
||
1437 | call ext2_lock |
||
1438 | |||
1439 | add esi, [esp + 16 + 4] |
||
1440 | |||
1441 | ; Can't write to root. |
||
1442 | cmp byte [esi], 0 |
||
1443 | jz .error |
||
1444 | |||
1445 | push ebx ecx edx |
||
1446 | stdcall ext2_inode_find, 0 |
||
1447 | pop edx ecx ebx |
||
1448 | ; If file not there, error. |
||
1449 | xor ecx, ecx |
||
1450 | test eax, eax |
||
1451 | jnz .error_file_not_found |
||
1452 | |||
1453 | ; Save the inode. |
||
1454 | push esi |
||
1455 | |||
1456 | ; Check if it's a file. |
||
1457 | mov edx, [ebp + EXTFS.ext2_save_inode] |
||
1458 | test [edx + EXT2_INODE_STRUC.i_mode], EXT2_S_IFREG |
||
1459 | jz .error |
||
1460 | |||
1461 | mov eax, esi |
||
1462 | mov ecx, [ebx + 4] |
||
1463 | |||
1464 | call ext2_inode_extend |
||
1465 | xor ecx, ecx |
||
1466 | test eax, eax |
||
1467 | jnz .error_device |
||
1468 | |||
1469 | ; ECX contains the size to write, and ESI points to it. |
||
1470 | mov ecx, [ebx + 0x0C] |
||
1471 | mov esi, [ebx + 0x10] |
||
1472 | |||
1473 | ; Save the size of the inode. |
||
1474 | mov eax, [edx + EXT2_INODE_STRUC.i_size] |
||
1475 | push eax |
||
1476 | |||
1477 | xor edx, edx |
||
1478 | div [ebp + EXTFS.block_size] |
||
1479 | |||
1480 | test edx, edx |
||
1481 | jz .start_aligned |
||
1482 | |||
1483 | ; Start isn't aligned, so deal with the non-aligned bytes. |
||
1484 | mov ebx, [ebp + EXTFS.block_size] |
||
1485 | sub ebx, edx |
||
1486 | |||
1487 | cmp ebx, ecx |
||
1488 | jbe @F |
||
1489 | |||
1490 | ; If the size to copy fits in current block, limit to that, instead of the entire block. |
||
1491 | mov ebx, ecx |
||
1492 | |||
1493 | @@: |
||
1494 | ; Copy EBX bytes, in EAX indexed block. |
||
1495 | push eax |
||
1496 | call ext2_inode_read_entry |
||
1497 | test eax, eax |
||
1498 | pop eax |
||
1499 | jnz .error_inode_size |
||
1500 | |||
1501 | push ecx |
||
1502 | |||
1503 | mov ecx, ebx |
||
1504 | mov edi, ebx |
||
1505 | add edi, edx |
||
1506 | rep movsb |
||
1507 | |||
1508 | pop ecx |
||
1509 | |||
1510 | ; Write the block. |
||
1511 | call ext2_inode_write_entry |
||
1512 | test eax, eax |
||
1513 | jnz .error_inode_size |
||
1514 | |||
1515 | add [esp], ebx |
||
1516 | sub ecx, ebx |
||
1517 | jz .write_inode |
||
1518 | |||
1519 | .start_aligned: |
||
1520 | cmp ecx, [ebp + EXTFS.block_size] |
||
1521 | jb @F |
||
1522 | |||
1523 | mov eax, [esp] |
||
1524 | xor edx, edx |
||
1525 | div [ebp + EXTFS.block_size] |
||
1526 | |||
1527 | push eax |
||
1528 | mov edx, [esp + 8] |
||
1529 | call ext2_inode_blank_entry |
||
1530 | test eax, eax |
||
1531 | pop eax |
||
1532 | jnz .error_inode_size |
||
1533 | |||
1534 | push ecx |
||
1535 | |||
1536 | mov ecx, [ebp + EXTFS.block_size] |
||
1537 | mov edi, [ebp + EXTFS.ext2_save_block] |
||
1538 | rep movsb |
||
1539 | |||
1540 | pop ecx |
||
1541 | |||
1542 | call ext2_inode_write_entry |
||
1543 | test eax, eax |
||
1544 | jnz .error_inode_size |
||
1545 | |||
1546 | mov eax, [ebp + EXTFS.block_size] |
||
1547 | sub ecx, eax |
||
1548 | add [esp], eax |
||
1549 | jmp .start_aligned |
||
1550 | |||
1551 | ; Handle the remaining bytes. |
||
1552 | @@: |
||
1553 | test ecx, ecx |
||
1554 | jz .write_inode |
||
1555 | |||
1556 | mov eax, [esp] |
||
1557 | xor edx, edx |
||
1558 | div [ebp + EXTFS.block_size] |
||
1559 | |||
1560 | push eax |
||
1561 | call ext2_inode_read_entry |
||
1562 | test eax, eax |
||
1563 | pop eax |
||
1564 | jz @F |
||
1565 | |||
1566 | push eax |
||
1567 | mov edx, [esp + 8] |
||
1568 | |||
1569 | call ext2_inode_blank_entry |
||
1570 | test eax, eax |
||
1571 | pop eax |
||
1572 | jnz .error_inode_size |
||
1573 | |||
1574 | @@: |
||
1575 | push ecx |
||
1576 | mov edi, [ebp + EXTFS.ext2_save_block] |
||
1577 | rep movsb |
||
1578 | pop ecx |
||
1579 | |||
1580 | call ext2_inode_write_entry |
||
1581 | test eax, eax |
||
1582 | jnz .error_inode_size |
||
1583 | |||
1584 | add [esp], ecx |
||
1585 | xor ecx, ecx |
||
1586 | |||
1587 | .write_inode: |
||
1588 | mov ebx, [ebp + EXTFS.ext2_temp_inode] |
||
1589 | pop eax |
||
1590 | mov [ebx + EXT2_INODE_STRUC.i_size], eax |
||
1591 | mov eax, [esp] |
||
1592 | |||
1593 | call ext2_inode_write |
||
1594 | test eax, eax |
||
1595 | jnz .error_device |
||
1596 | |||
1597 | .success: |
||
1598 | call ext2_sb_update |
||
1599 | |||
1600 | ; Sync the disk. |
||
1601 | mov esi, [ebp + PARTITION.Disk] |
||
1602 | call disk_sync ; eax contains error code, if any. |
||
1603 | |||
1604 | .return: |
||
1605 | push eax |
||
1606 | call ext2_unlock |
||
1607 | pop eax |
||
1608 | |||
1609 | add esp, 4 |
||
1610 | |||
1611 | mov ebx, [esp + 12] |
||
1612 | sub ebx, ecx |
||
1613 | pop edi esi edx ecx |
||
1614 | |||
1615 | ;DEBUGF 1, "and returning with: %x.\n", eax |
||
1616 | ret |
||
1617 | |||
1618 | .error: |
||
1619 | mov eax, ERROR_ACCESS_DENIED |
||
1620 | jmp .return |
||
1621 | |||
1622 | .error_file_not_found: |
||
1623 | mov eax, ERROR_FILE_NOT_FOUND |
||
1624 | jmp .return |
||
1625 | |||
1626 | .error_inode_size: |
||
1627 | mov ebx, [ebp + EXTFS.ext2_temp_inode] |
||
1628 | pop eax |
||
1629 | mov [ebx + EXT2_INODE_STRUC.i_size], eax |
||
1630 | mov eax, [esp] |
||
1631 | |||
1632 | call ext2_inode_write |
||
1633 | |||
1634 | .error_device: |
||
1635 | call ext2_sb_update |
||
1636 | |||
1637 | ; Sync the disk. |
||
1638 | mov esi, [ebp + PARTITION.Disk] |
||
1639 | call disk_sync ; eax contains error code, if any. |
||
1640 | |||
1641 | mov eax, ERROR_DEVICE |
||
1642 | jmp .return |
||
1643 | |||
1644 | ;--------------------------------------------------------------------- |
||
1645 | ; Set the end of a file. |
||
1646 | ; Input: esi + [esp + 4] = file name. |
||
1647 | ; ebx = pointer to paramteres from sysfunc 70. |
||
1648 | ; ebp = pointer to EXTFS structure. |
||
1649 | ; Output: eax = error code. |
||
1650 | ;--------------------------------------------------------------------- |
||
1651 | ext2_SetFileEnd: |
||
1652 | test [ebp + EXTFS.partition_flags], EXT2_RO |
||
1653 | jz @F |
||
1654 | |||
1655 | mov eax, ERROR_UNSUPPORTED_FS |
||
1656 | ret |
||
1657 | |||
1658 | @@: |
||
1659 | push ebx ecx edx esi edi |
||
1660 | call ext2_lock |
||
1661 | |||
1662 | add esi, [esp + 20 + 4] |
||
1663 | |||
1664 | ; Can't write to root. |
||
1665 | cmp byte [esi], 0 |
||
1666 | jz .error |
||
1667 | |||
1668 | stdcall ext2_inode_find, 0 |
||
1669 | ; If file not there, error. |
||
1670 | test eax, eax |
||
1671 | jnz .error_file_not_found |
||
1672 | |||
1673 | ; Check if it's a file. |
||
1674 | mov edx, [ebp + EXTFS.ext2_save_inode] |
||
1675 | cmp [edx + EXT2_INODE_STRUC.i_mode], EXT2_S_IFREG |
||
1676 | jne .error |
||
1677 | |||
1678 | mov eax, esi |
||
1679 | mov ecx, [ebx + 4] |
||
1680 | call ext2_inode_extend |
||
1681 | test eax, eax |
||
1682 | jnz .error_disk_full |
||
1683 | |||
1684 | mov eax, esi |
||
1685 | call ext2_inode_truncate |
||
1686 | test eax, eax |
||
1687 | jnz .error_disk_full |
||
1688 | |||
1689 | mov eax, esi |
||
1690 | mov ebx, [ebp + EXTFS.ext2_temp_inode] |
||
1691 | call ext2_inode_write |
||
1692 | |||
1693 | call ext2_sb_update |
||
1694 | |||
1695 | ; Sync the disk. |
||
1696 | mov esi, [ebp + PARTITION.Disk] |
||
1697 | call disk_sync ; eax contains error code, if any. |
||
1698 | |||
1699 | .return: |
||
1700 | push eax |
||
1701 | call ext2_unlock |
||
1702 | pop eax |
||
1703 | |||
1704 | pop edi esi edx ecx ebx |
||
1705 | ret |
||
1706 | |||
1707 | .error: |
||
1708 | mov eax, ERROR_ACCESS_DENIED |
||
1709 | jmp .return |
||
1710 | |||
1711 | .error_file_not_found: |
||
1712 | mov eax, ERROR_FILE_NOT_FOUND |
||
1713 | jmp .return |
||
1714 | |||
1715 | .error_disk_full: |
||
1716 | call ext2_sb_update |
||
1717 | |||
1718 | ; Sync the disk. |
||
1719 | mov esi, [ebp + PARTITION.Disk] |
||
1720 | call disk_sync ; eax contains error code, if any. |
||
1721 | |||
1722 | mov eax, ERROR_DISK_FULL |
||
1723 | jmp .return |