2013-11-21 03:42:12 +01:00
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; ;;
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;; Contains ext2 structures, and macros. ;;
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;; ;;
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2014-12-01 04:51:07 +01:00
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;; Copyright (C) KolibriOS team 2013-2014. All rights reserved. ;;
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;; Distributed under terms of the GNU General Public License ;;
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2013-11-21 03:42:12 +01:00
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;; ;;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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2014-12-01 04:51:07 +01:00
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$Revision: 4891 $
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2013-11-21 03:42:12 +01:00
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; Future jobs for driver, in order of preference:
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; * clean up existing extents support.
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; * add b-tree directories support.
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; * add long file support.
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; * add journal support.
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; * add minor features that come with ext3/4.
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; Recommended move to some kernel-wide bitmap handling code (with a bit of abstraction, of course).
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;---------------------------------------------------------------------
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; Clears a bit.
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; Input: eax = index into bitmap.
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; [EXTFS.ext2_save_block] = address of bitmap.
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; ebp = address of EXTFS.
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; Output: Bit cleared.
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; eax = non-zero, if already cleared.
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;---------------------------------------------------------------------
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bitmap_clear_bit:
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push ebx ecx edx
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xor edx, edx
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mov ecx, 8
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div ecx
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add eax, [ebp + EXTFS.ext2_save_block]
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; Get the mask.
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mov ebx, 1
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mov ecx, edx
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shl ebx, cl
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test [eax], ebx
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jz .cleared
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not ebx
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and [eax], ebx
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xor eax, eax
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.return:
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pop edx ecx ebx
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ret
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; Already cleared.
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.cleared:
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xor eax, eax
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not eax
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jmp .return
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;---------------------------------------------------------------------
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; Finds free bit in the bitmap.
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; Input: ecx = number of bits in the bitmap.
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; [EXTFS.ext2_save_block] = address of bitmap.
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; ebp = address of EXTFS.
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; Output: eax = index of free bit in the bitmap; marked set.
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; 0xFFFFFFFF if no free bit found.
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;---------------------------------------------------------------------
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ext2_find_free_bit:
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bitmap_find_free_bit:
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push esi ebx ecx edx
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mov esi, [ebp + EXTFS.ext2_save_block]
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; Get total DWORDS in eax; total bits in last dword, if any, in edx.
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xor edx, edx
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mov eax, ecx
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mov ecx, 32
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div ecx
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mov ecx, eax
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xor eax, eax
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push edx
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test ecx, ecx
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jz .last_bits
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; Check in the DWORDS.
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.dwords:
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mov ebx, [esi]
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not ebx
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bsf edx, ebx
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; If 0, then the original value would be 0xFFFFFFFF, hence no free bits.
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jz @F
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; We found the value. Let's return with it.
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add esp, 4
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add eax, edx
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jmp .return
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@@:
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add esi, 4
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add eax, 32
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loop .dwords
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.last_bits:
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; Check in the last few bits.
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pop ecx
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test ecx, ecx
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jz @F
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mov ebx, [esi]
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not ebx
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bsf ebx, edx
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; If 0, no free bits.
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jz @F
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; If free bit is greater than the last known bit, then error.
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cmp edx, ecx
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jg @F
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add eax, edx
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jmp .return
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@@:
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; Didn't find any free bits.
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xor eax, eax
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not eax
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jmp @F
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.return:
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mov ecx, edx
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mov edx, 1
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shl edx, cl
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or [esi], edx
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@@:
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pop edx ecx ebx esi
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ret
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; Recommended move to some kernel-wide string handling code.
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;---------------------------------------------------------------------
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; Find the length of a string.
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; Input: esi = source.
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; Output: length in ecx
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;---------------------------------------------------------------------
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strlen:
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push eax esi
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xor ecx, ecx
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@@:
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lodsb
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test al, al
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jz .ret
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inc ecx
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jmp @B
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.ret:
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pop esi eax
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ret
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;---------------------------------------------------------------------
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; Convert UTF-8 string to ASCII-string (codepage 866)
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; Input: esi = source.
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; edi = buffer.
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; ecx = length of source.
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; Output: destroys eax, esi, edi
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;---------------------------------------------------------------------
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utf8_to_cp866:
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; Check for zero-length string.
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jecxz .return
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.start:
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lodsw
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cmp al, 0x80
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jb .ascii
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xchg al, ah ; Big-endian.
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cmp ax, 0xd080
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jz .yo1
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cmp ax, 0xd191
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jz .yo2
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cmp ax, 0xd090
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jb .unk
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cmp ax, 0xd180
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jb .rus1
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cmp ax, 0xd190
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jb .rus2
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.unk:
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mov al, '_'
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jmp .doit
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.yo1:
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mov al, 0xf0 ; Ё capital.
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jmp .doit
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.yo2:
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mov al, 0xf1 ; ё small.
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jmp .doit
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.rus1:
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sub ax, 0xd090 - 0x80
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jmp .doit
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.rus2:
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sub ax, 0xd18f - 0xEF
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.doit:
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stosb
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sub ecx, 2
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ja .start
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ret
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.ascii:
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stosb
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dec esi
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dec ecx
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jnz .start
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.return:
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ret
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; Recommended move to some kernel-wide time handling code.
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; Total cumulative seconds till each month.
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cumulative_seconds_in_month:
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.january: dd 0 * (60 * 60 * 24)
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.february: dd 31 * (60 * 60 * 24)
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.march: dd 59 * (60 * 60 * 24)
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.april: dd 90 * (60 * 60 * 24)
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.may: dd 120 * (60 * 60 * 24)
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.june: dd 151 * (60 * 60 * 24)
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.july: dd 181 * (60 * 60 * 24)
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.august: dd 212 * (60 * 60 * 24)
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.september: dd 243 * (60 * 60 * 24)
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.october: dd 273 * (60 * 60 * 24)
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.november: dd 304 * (60 * 60 * 24)
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.december: dd 334 * (60 * 60 * 24)
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current_bdfe_time:
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dd 0
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current_bdfe_date:
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dd 0
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;---------------------------------------------------------------------
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; Stores current unix time.
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; Input: edi = buffer to output Unix time.
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;---------------------------------------------------------------------
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current_unix_time:
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push eax esi
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mov esi, current_bdfe_time
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; Just a small observation:
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; The CMOS is a pretty bad source to get time from. One shouldn't rely on it,
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; since it messes up the time by tiny bits. Of course, this is all technical,
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; but one can look it up on the osdev wiki. What is better is to get the time
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; from CMOS during boot, then update system time using a more accurate timer.
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; I'll probably add that after the Summer of Code, so TODO! TODO! TODO!.
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; Get time from CMOS.
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; Seconds.
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mov al, 0x00
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out 0x70, al
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in al, 0x71
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call bcd2bin
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mov [esi + 0], al
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; Minute.
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mov al, 0x02
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out 0x70, al
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in al, 0x71
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call bcd2bin
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mov [esi + 1], al
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; Hour.
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mov al, 0x04
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out 0x70, al
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in al, 0x71
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call bcd2bin
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mov [esi + 2], al
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; Get date.
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; Day.
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mov al, 0x7
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out 0x70, al
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in al, 0x71
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call bcd2bin
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mov [esi + 4], al
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; Month.
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mov al, 0x8
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out 0x70, al
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in al, 0x71
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call bcd2bin
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mov [esi + 5], al
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; Year.
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mov al, 0x9
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out 0x70, al
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in al, 0x71
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call bcd2bin
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add ax, 2000 ; CMOS only returns last two digits.
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; Note that everywhere in KolibriOS this is used.
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; This is hacky, since the RTC can be incorrectly set
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; to something before 2000.
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mov [esi + 6], ax
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call bdfe_to_unix_time
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pop esi eax
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ret
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;---------------------------------------------------------------------
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; Convert time+date from BDFE to Unix time.
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; Input: esi = pointer to BDFE time+date.
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; edi = buffer to output Unix time.
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;---------------------------------------------------------------------
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bdfe_to_unix_time:
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push eax ebx ecx edx
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mov dword[edi], 0x00000000
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; The minimum representable time is 1901-12-13.
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cmp word[esi + 6], 1901
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jb .ret
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jg .max
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cmp byte[esi + 5], 12
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jb .ret
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cmp byte[esi + 4], 13
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jbe .ret
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jg .convert
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; Check if it is more than the maximum representable time.
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.max:
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; The maximum representable time is 2038-01-19.
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cmp word[esi + 6], 2038
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jg .ret
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jb .convert
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cmp byte[esi + 5], 1
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jg .ret
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cmp byte[esi + 4], 19
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jge .ret
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; Convert the time.
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.convert:
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; Get if current year is leap year in ECX.
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xor ecx, ecx
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mov ebx, 4
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xor edx, edx
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cmp word[esi + 6], 1970
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jb .negative
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movzx eax, word[esi + 6] ; Year.
|
|
|
|
|
cmp byte[esi + 5], 3 ; If the month is less than March, than that year doesn't matter.
|
|
|
|
|
jge @F
|
|
|
|
|
|
|
|
|
|
test eax, 3
|
|
|
|
|
; Not a leap year.
|
|
|
|
|
jnz @F
|
|
|
|
|
|
|
|
|
|
inc ecx
|
|
|
|
|
@@:
|
|
|
|
|
; Number of leap years between two years = ((end date - 1)/4) - (1970/4)
|
|
|
|
|
dec eax
|
|
|
|
|
div ebx
|
|
|
|
|
sub eax, 1970/4
|
|
|
|
|
|
|
|
|
|
; EAX is the number of leap years.
|
|
|
|
|
add eax, ecx
|
|
|
|
|
mov ecx, (60 * 60 * 24) ; Seconds in a day.
|
|
|
|
|
mul ecx
|
|
|
|
|
|
|
|
|
|
; Account for leap years, i.e., one day extra for each.
|
|
|
|
|
add [edi], eax
|
|
|
|
|
|
|
|
|
|
; Get total days in EAX.
|
|
|
|
|
movzx eax, byte[esi + 4]
|
|
|
|
|
dec eax
|
|
|
|
|
mul ecx
|
|
|
|
|
|
|
|
|
|
; Account for days.
|
|
|
|
|
add [edi], eax
|
|
|
|
|
|
|
|
|
|
; Account for month.
|
|
|
|
|
movzx eax, byte[esi + 5]
|
|
|
|
|
dec eax
|
|
|
|
|
mov eax, [cumulative_seconds_in_month + (eax * 4)]
|
|
|
|
|
add [edi], eax
|
|
|
|
|
|
|
|
|
|
; Account for year.
|
|
|
|
|
movzx eax, word[esi + 6]
|
|
|
|
|
sub eax, 1970
|
|
|
|
|
mov ecx, (60 * 60 * 24) * 365 ; Seconds in a year.
|
|
|
|
|
mul ecx
|
|
|
|
|
add [edi], eax
|
|
|
|
|
|
|
|
|
|
; Seconds.
|
|
|
|
|
movzx eax, byte[esi + 0]
|
|
|
|
|
add [edi], eax
|
|
|
|
|
|
|
|
|
|
; Minutes.
|
|
|
|
|
movzx eax, byte[esi + 1]
|
|
|
|
|
mov ecx, 60
|
|
|
|
|
mul ecx
|
|
|
|
|
add [edi], eax
|
|
|
|
|
|
|
|
|
|
; Hours.
|
|
|
|
|
movzx eax, byte[esi + 2]
|
|
|
|
|
mov ecx, (60 * 60)
|
|
|
|
|
mul ecx
|
|
|
|
|
add [edi], eax
|
|
|
|
|
|
|
|
|
|
; The time wanted is before the epoch; handle it here.
|
|
|
|
|
.negative:
|
|
|
|
|
; TODO.
|
|
|
|
|
|
|
|
|
|
.ret:
|
|
|
|
|
pop edx ecx ebx eax
|
|
|
|
|
ret
|
|
|
|
|
|
|
|
|
|
; Recommended move to some kernel-wide alloc handling code.
|
|
|
|
|
macro KERNEL_ALLOC store, label
|
|
|
|
|
{
|
|
|
|
|
call kernel_alloc
|
|
|
|
|
mov store, eax
|
|
|
|
|
test eax, eax
|
|
|
|
|
jz label
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
macro KERNEL_FREE data, label
|
|
|
|
|
{
|
|
|
|
|
cmp data, 0
|
|
|
|
|
jz label
|
|
|
|
|
push data
|
|
|
|
|
call kernel_free
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
struct EXTFS PARTITION
|
|
|
|
|
lock MUTEX
|
|
|
|
|
partition_flags dd ?
|
|
|
|
|
log_block_size dd ?
|
|
|
|
|
block_size dd ?
|
|
|
|
|
count_block_in_block dd ?
|
|
|
|
|
blocks_per_group dd ?
|
|
|
|
|
global_desc_table dd ?
|
|
|
|
|
root_inode dd ? ; Pointer to root inode in memory.
|
|
|
|
|
inode_size dd ?
|
|
|
|
|
count_pointer_in_block dd ? ; (block_size / 4)
|
|
|
|
|
count_pointer_in_block_square dd ? ; (block_size / 4)**2
|
|
|
|
|
ext2_save_block dd ? ; Block for 1 global procedure.
|
|
|
|
|
ext2_temp_block dd ? ; Block for small procedures.
|
|
|
|
|
ext2_save_inode dd ? ; inode for global procedures.
|
|
|
|
|
ext2_temp_inode dd ? ; inode for small procedures.
|
|
|
|
|
groups_count dd ?
|
|
|
|
|
superblock rd 1024/4
|
|
|
|
|
ends
|
|
|
|
|
|
|
|
|
|
; EXT2 revisions.
|
|
|
|
|
EXT2_GOOD_OLD_REV = 0
|
|
|
|
|
|
|
|
|
|
; For fs_type.
|
|
|
|
|
FS_TYPE_UNDEFINED = 0
|
|
|
|
|
FS_TYPE_EXT = 2
|
|
|
|
|
|
|
|
|
|
; Some set inodes.
|
|
|
|
|
EXT2_BAD_INO = 1
|
|
|
|
|
EXT2_ROOT_INO = 2
|
|
|
|
|
EXT2_ACL_IDX_INO = 3
|
|
|
|
|
EXT2_ACL_DATA_INO = 4
|
|
|
|
|
EXT2_BOOT_LOADER_INO = 5
|
|
|
|
|
EXT2_UNDEL_DIR_INO = 6
|
|
|
|
|
|
|
|
|
|
; EXT2_SUPER_MAGIC.
|
|
|
|
|
EXT2_SUPER_MAGIC = 0xEF53
|
|
|
|
|
EXT2_VALID_FS = 1
|
|
|
|
|
|
|
|
|
|
; Flags defining i_mode values.
|
|
|
|
|
EXT2_S_IFMT = 0xF000 ; Mask for file type.
|
|
|
|
|
|
|
|
|
|
EXT2_S_IFREG = 0x8000 ; Regular file.
|
|
|
|
|
EXT2_S_IFDIR = 0x4000 ; Directory.
|
|
|
|
|
|
|
|
|
|
EXT2_S_IRUSR = 0x0100 ; User read
|
|
|
|
|
EXT2_S_IWUSR = 0x0080 ; User write
|
|
|
|
|
EXT2_S_IXUSR = 0x0040 ; User execute
|
|
|
|
|
EXT2_S_IRGRP = 0x0020 ; Group read
|
|
|
|
|
EXT2_S_IWGRP = 0x0010 ; Group write
|
|
|
|
|
EXT2_S_IXGRP = 0x0008 ; Group execute
|
|
|
|
|
EXT2_S_IROTH = 0x0004 ; Others read
|
|
|
|
|
EXT2_S_IWOTH = 0x0002 ; Others write
|
|
|
|
|
EXT2_S_IXOTH = 0x0001 ; Others execute
|
|
|
|
|
|
|
|
|
|
PERMISSIONS = EXT2_S_IRUSR or EXT2_S_IWUSR \
|
|
|
|
|
or EXT2_S_IRGRP or EXT2_S_IWGRP \
|
|
|
|
|
or EXT2_S_IROTH or EXT2_S_IWOTH
|
|
|
|
|
|
|
|
|
|
; File type defining values in directory entry.
|
|
|
|
|
EXT2_FT_REG_FILE = 1 ; Regular file.
|
|
|
|
|
EXT2_FT_DIR = 2 ; Directory.
|
|
|
|
|
|
|
|
|
|
; Flags used by KolibriOS.
|
|
|
|
|
FS_FT_HIDDEN = 2
|
|
|
|
|
FS_FT_DIR = 0x10 ; Directory.
|
|
|
|
|
|
|
|
|
|
; ext2 partition flags.
|
|
|
|
|
EXT2_RO = 0x01
|
|
|
|
|
|
|
|
|
|
FS_FT_ASCII = 0 ; Name in ASCII.
|
|
|
|
|
FS_FT_UNICODE = 1 ; Name in Unicode.
|
|
|
|
|
|
|
|
|
|
EXT2_FEATURE_INCOMPAT_FILETYPE = 0x0002 ; Have file type in directory entry.
|
|
|
|
|
EXT4_FEATURE_INCOMPAT_EXTENTS = 0x0040 ; Extents.
|
|
|
|
|
EXT4_FEATURE_INCOMPAT_FLEX_BG = 0x0200 ; Flexible block groups.
|
|
|
|
|
|
|
|
|
|
EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER = 0x0001 ; Sparse Superblock
|
|
|
|
|
EXT2_FEATURE_RO_COMPAT_LARGE_FILE = 0x0002 ; Large file support (64-bit file size)
|
|
|
|
|
|
|
|
|
|
; Implemented ext[2,3,4] features.
|
|
|
|
|
EXT4_FEATURE_INCOMPAT_SUPP = EXT2_FEATURE_INCOMPAT_FILETYPE \
|
|
|
|
|
or EXT4_FEATURE_INCOMPAT_EXTENTS \
|
|
|
|
|
or EXT4_FEATURE_INCOMPAT_FLEX_BG
|
|
|
|
|
|
|
|
|
|
; Implemented features which otherwise require "read-only" mount.
|
|
|
|
|
EXT2_FEATURE_RO_COMPAT_SUPP = EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER \
|
|
|
|
|
or EXT2_FEATURE_RO_COMPAT_LARGE_FILE
|
|
|
|
|
|
|
|
|
|
; ext4 features not support for write.
|
|
|
|
|
EXT4_FEATURE_INCOMPAT_W_NOT_SUPP = EXT4_FEATURE_INCOMPAT_EXTENTS \
|
|
|
|
|
or EXT4_FEATURE_INCOMPAT_FLEX_BG
|
|
|
|
|
|
|
|
|
|
; Flags specified in i_flags.
|
|
|
|
|
EXT2_EXTENTS_FL = 0x00080000 ; Extents.
|
|
|
|
|
|
|
|
|
|
struct EXT2_INODE_STRUC
|
|
|
|
|
i_mode dw ?
|
|
|
|
|
i_uid dw ?
|
|
|
|
|
i_size dd ?
|
|
|
|
|
i_atime dd ?
|
|
|
|
|
i_ctime dd ?
|
|
|
|
|
i_mtime dd ?
|
|
|
|
|
i_dtime dd ?
|
|
|
|
|
i_gid dw ?
|
|
|
|
|
i_links_count dw ?
|
|
|
|
|
i_blocks dd ?
|
|
|
|
|
i_flags dd ?
|
|
|
|
|
i_osd1 dd ?
|
|
|
|
|
i_block rd 15
|
|
|
|
|
i_generation dd ?
|
|
|
|
|
i_file_acl dd ?
|
|
|
|
|
i_dir_acl dd ?
|
|
|
|
|
i_faddr dd ?
|
|
|
|
|
i_osd2 dd ? ; 12 bytes.
|
|
|
|
|
ends
|
|
|
|
|
|
|
|
|
|
struct EXT2_DIR_STRUC
|
|
|
|
|
inode dd ?
|
|
|
|
|
rec_len dw ?
|
|
|
|
|
name_len db ?
|
|
|
|
|
file_type db ?
|
|
|
|
|
name db ? ; 255 (max) bytes.
|
|
|
|
|
ends
|
|
|
|
|
|
|
|
|
|
struct EXT2_BLOCK_GROUP_DESC
|
|
|
|
|
block_bitmap dd ? ; +0
|
|
|
|
|
inode_bitmap dd ? ; +4
|
|
|
|
|
inode_table dd ? ; +8
|
|
|
|
|
free_blocks_count dw ? ; +12
|
|
|
|
|
free_inodes_count dw ? ; +14
|
|
|
|
|
used_dirs_count dw ? ; +16
|
|
|
|
|
pad dw ? ; +18
|
|
|
|
|
reserved rb 12 ; +20
|
|
|
|
|
ends
|
|
|
|
|
|
|
|
|
|
struct EXT2_SB_STRUC
|
|
|
|
|
inodes_count dd ? ; +0
|
|
|
|
|
blocks_count dd ? ; +4
|
|
|
|
|
r_block_count dd ? ; +8
|
|
|
|
|
free_block_count dd ? ; +12
|
|
|
|
|
free_inodes_count dd ? ; +16
|
|
|
|
|
first_data_block dd ? ; +20
|
|
|
|
|
log_block_size dd ? ; +24
|
|
|
|
|
log_frag_size dd ? ; +28
|
|
|
|
|
blocks_per_group dd ? ; +32
|
|
|
|
|
frags_per_group dd ? ; +36
|
|
|
|
|
inodes_per_group dd ? ; +40
|
|
|
|
|
mtime dd ? ; +44
|
|
|
|
|
wtime dd ? ; +48
|
|
|
|
|
mnt_count dw ? ; +52
|
|
|
|
|
max_mnt_count dw ? ; +54
|
|
|
|
|
magic dw ? ; +56
|
|
|
|
|
state dw ? ; +58
|
|
|
|
|
errors dw ? ; +60
|
|
|
|
|
minor_rev_level dw ? ; +62
|
|
|
|
|
lastcheck dd ? ; +64
|
|
|
|
|
check_intervals dd ? ; +68
|
|
|
|
|
creator_os dd ? ; +72
|
|
|
|
|
rev_level dd ? ; +76
|
|
|
|
|
def_resuid dw ? ; +80
|
|
|
|
|
def_resgid dw ? ; +82
|
|
|
|
|
first_ino dd ? ; +84
|
|
|
|
|
inode_size dw ? ; +88
|
|
|
|
|
block_group_nr dw ? ; +90
|
|
|
|
|
feature_compat dd ? ; +92
|
|
|
|
|
feature_incompat dd ? ; +96
|
|
|
|
|
feature_ro_compat dd ? ; +100
|
|
|
|
|
uuid rb 16 ; +104
|
|
|
|
|
volume_name rb 16 ; +120
|
|
|
|
|
last_mounted rb 64 ; +136
|
|
|
|
|
algo_bitmap dd ? ; +200
|
|
|
|
|
prealloc_blocks db ? ; +204
|
|
|
|
|
preallock_dir_blocks db ? ; +205
|
|
|
|
|
reserved_gdt_blocks dw ? ; +206
|
|
|
|
|
journal_uuid rb 16 ; +208
|
|
|
|
|
journal_inum dd ? ; +224
|
|
|
|
|
journal_dev dd ? ; +228
|
|
|
|
|
last_orphan dd ? ; +232
|
|
|
|
|
hash_seed rd 4 ; +236
|
|
|
|
|
def_hash_version db ? ; +252
|
|
|
|
|
reserved rb 3 ; +253 (reserved)
|
|
|
|
|
default_mount_options dd ? ; +256
|
|
|
|
|
first_meta_bg dd ? ; +260
|
|
|
|
|
mkfs_time dd ? ; +264
|
|
|
|
|
jnl_blocks rd 17 ; +268
|
|
|
|
|
blocks_count_hi dd ? ; +336
|
|
|
|
|
r_blocks_count_hi dd ? ; +340
|
|
|
|
|
free_blocks_count_hi dd ? ; +344
|
|
|
|
|
min_extra_isize dw ? ; +348
|
|
|
|
|
want_extra_isize dw ? ; +350
|
|
|
|
|
flags dd ? ; +352
|
|
|
|
|
raid_stride dw ? ; +356
|
|
|
|
|
mmp_interval dw ? ; +358
|
|
|
|
|
mmp_block dq ? ; +360
|
|
|
|
|
raid_stripe_width dd ? ; +368
|
|
|
|
|
log_groups_per_flex db ? ; +372
|
|
|
|
|
ends
|
|
|
|
|
|
|
|
|
|
; Header block extents.
|
|
|
|
|
struct EXT4_EXTENT_HEADER
|
|
|
|
|
eh_magic dw ? ; Magic value of 0xF30A, for ext4.
|
|
|
|
|
eh_entries dw ? ; Number of blocks covered by the extent.
|
|
|
|
|
eh_max dw ? ; Capacity of entries.
|
|
|
|
|
eh_depth dw ? ; Tree depth (if 0, extents in the array are not extent indexes)
|
|
|
|
|
eh_generation dd ? ; ???
|
|
|
|
|
ends
|
|
|
|
|
|
|
|
|
|
; Extent.
|
|
|
|
|
struct EXT4_EXTENT
|
|
|
|
|
ee_block dd ? ; First logical block extent covers.
|
|
|
|
|
ee_len dw ? ; Number of blocks covered by extent.
|
|
|
|
|
ee_start_hi dw ? ; Upper 16 bits of 48-bit address (unused in KOS)
|
|
|
|
|
ee_start_lo dd ? ; Lower 32 bits of 48-bit address.
|
|
|
|
|
ends
|
|
|
|
|
|
|
|
|
|
; Index on-disk structure; pointer to block of extents/indexes.
|
|
|
|
|
struct EXT4_EXTENT_IDX
|
|
|
|
|
ei_block dd ? ; Covers logical blocks from here.
|
|
|
|
|
ei_leaf_lo dd ? ; Lower 32-bits of pointer to the physical block of the next level.
|
|
|
|
|
ei_leaf_hi dw ? ; Higher 16-bits (unused in KOS).
|
|
|
|
|
ei_unused dw ? ; Reserved.
|
|
|
|
|
ends
|
