forked from KolibriOS/kolibrios
413 lines
13 KiB
PHP
413 lines
13 KiB
PHP
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|
;; ;;
|
|
;; Contains ext2 block handling code. ;;
|
|
;; ;;
|
|
;; Copyright (C) KolibriOS team 2013-2014. All rights reserved. ;;
|
|
;; Distributed under terms of the GNU General Public License ;;
|
|
;; ;;
|
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
|
|
|
$Revision: 4891 $
|
|
|
|
|
|
;---------------------------------------------------------------------
|
|
; Write ext2 block from memory to disk.
|
|
; Input: eax = i_block (block number in ext2 terms);
|
|
; ebx = buffer address
|
|
; ebp = pointer to EXTFS
|
|
; Output: eax = error code (0 implies no error)
|
|
;---------------------------------------------------------------------
|
|
ext2_block_write:
|
|
push edx ebx ecx
|
|
|
|
mov edx, fs_write32_sys
|
|
jmp ext2_block_modify
|
|
|
|
;---------------------------------------------------------------------
|
|
; Read ext2 block from disk to memory.
|
|
; Input: eax = i_block (block number in ext2 terms);
|
|
; ebx = address of where to read block
|
|
; ebp = pointer to EXTFS
|
|
; Output: eax = error code (0 implies no error)
|
|
;---------------------------------------------------------------------
|
|
ext2_block_read:
|
|
push edx ebx ecx
|
|
|
|
mov edx, fs_read32_sys
|
|
jmp ext2_block_modify
|
|
|
|
;---------------------------------------------------------------------
|
|
; Modify ext2 block.
|
|
; Input: eax = i_block (block number in ext2 terms);
|
|
; ebx = I/O buffer address;
|
|
; edx = fs_read/write32_sys
|
|
; ebp = pointer to EXTFS
|
|
; edx, ebx, ecx on stack.
|
|
; Output: eax = error code (0 implies no error)
|
|
;---------------------------------------------------------------------
|
|
ext2_block_modify:
|
|
; Get block number in hard-disk terms in eax.
|
|
mov ecx, [ebp + EXTFS.log_block_size]
|
|
shl eax, cl
|
|
mov ecx, eax
|
|
push [ebp + EXTFS.count_block_in_block]
|
|
|
|
@@:
|
|
mov eax, ecx
|
|
call edx
|
|
test eax, eax
|
|
jnz .fail
|
|
|
|
inc ecx
|
|
add ebx, 512
|
|
dec dword[esp]
|
|
jnz @B
|
|
|
|
xor eax, eax
|
|
@@:
|
|
pop ecx
|
|
pop ecx ebx edx
|
|
ret
|
|
|
|
.fail:
|
|
mov eax, ERROR_DEVICE
|
|
jmp @B
|
|
|
|
;---------------------------------------------------------------------
|
|
; Zeroes a block.
|
|
; Input: ebx = block ID.
|
|
; ebp = pointer to EXTFS.
|
|
; Output: eax = error code.
|
|
;---------------------------------------------------------------------
|
|
ext2_block_zero:
|
|
push ebx
|
|
|
|
mov eax, ebx
|
|
mov ebx, [ebp + EXTFS.ext2_temp_block]
|
|
|
|
call ext2_block_read
|
|
test eax, eax
|
|
jnz .return
|
|
|
|
push edi ecx
|
|
xor eax, eax
|
|
mov ecx, [ebp + EXTFS.block_size]
|
|
mov edi, [ebp + EXTFS.ext2_temp_block]
|
|
rep stosb
|
|
pop ecx edi
|
|
|
|
mov eax, [esp]
|
|
call ext2_block_write
|
|
|
|
.return:
|
|
pop ebx
|
|
ret
|
|
|
|
;---------------------------------------------------------------------
|
|
; Allocates a block.
|
|
; Input: eax = inode ID for "preference".
|
|
; ebp = pointer to EXTFS.
|
|
; Output: Block marked as set in block group.
|
|
; eax = error code.
|
|
; ebx = block ID.
|
|
;---------------------------------------------------------------------
|
|
ext2_block_alloc:
|
|
push [ebp + EXTFS.superblock + EXT2_SB_STRUC.blocks_count]
|
|
push EXT2_BLOCK_GROUP_DESC.free_blocks_count
|
|
push [ebp + EXTFS.superblock + EXT2_SB_STRUC.blocks_per_group]
|
|
|
|
lea ebx, [ebp + EXTFS.superblock + EXT2_SB_STRUC.free_block_count]
|
|
push ebx
|
|
|
|
push ext2_bg_read_blk_bitmap
|
|
|
|
call ext2_resource_alloc
|
|
|
|
ret
|
|
|
|
;---------------------------------------------------------------------
|
|
; Zero-allocates a block.
|
|
; Input: eax = inode ID for "preference".
|
|
; ebp = pointer to EXTFS.
|
|
; Output: Block marked as set in block group.
|
|
; eax = error code.
|
|
; ebx = block ID.
|
|
;---------------------------------------------------------------------
|
|
ext2_block_calloc:
|
|
call ext2_block_alloc
|
|
test eax, eax
|
|
jnz @F
|
|
|
|
call ext2_block_zero
|
|
@@:
|
|
ret
|
|
|
|
;---------------------------------------------------------------------
|
|
; Frees a block.
|
|
; Input: eax = block ID.
|
|
; ebp = pointer to EXTFS.
|
|
; Output: Block marked as free in block group.
|
|
; eax = error code.
|
|
;---------------------------------------------------------------------
|
|
ext2_block_free:
|
|
push edi ecx
|
|
|
|
mov edi, ext2_bg_read_blk_bitmap
|
|
xor ecx, ecx
|
|
call ext2_resource_free
|
|
|
|
pop ecx edi
|
|
ret
|
|
|
|
;---------------------------------------------------------------------
|
|
; Find parent from file path in block.
|
|
; Input: esi = file path.
|
|
; ebx = pointer to directory block.
|
|
; ebp = pointer to EXTFS structure.
|
|
; Output: esi = name without parent, or not changed.
|
|
; ebx = directory record matched.
|
|
;---------------------------------------------------------------------
|
|
ext2_block_find_parent:
|
|
sub esp, 256 ; Space for EXT2 filename.
|
|
mov edx, ebx
|
|
add edx, [ebp + EXTFS.block_size] ; Save block end.
|
|
|
|
.start_rec:
|
|
cmp [ebx + EXT2_DIR_STRUC.inode], 0
|
|
jz .next_rec
|
|
|
|
mov edi, esp
|
|
push esi
|
|
movzx ecx, [ebx + EXT2_DIR_STRUC.name_len]
|
|
lea esi, [ebx + EXT2_DIR_STRUC.name]
|
|
call utf8_to_cp866
|
|
|
|
mov ecx, edi
|
|
lea edi, [esp + 4]
|
|
sub ecx, edi ; Number of bytes in resulting string.
|
|
|
|
mov esi, [esp]
|
|
|
|
; esi: original file path.
|
|
; edi: converted string stored on stack.
|
|
; ecx: size of converted string.
|
|
@@:
|
|
; If no bytes left in resulting string, test it.
|
|
jecxz .test_find
|
|
dec ecx
|
|
|
|
lodsb
|
|
call char_toupper
|
|
|
|
mov ah, [edi]
|
|
inc edi
|
|
xchg al, ah
|
|
call char_toupper
|
|
|
|
; If both are same, check next byte.
|
|
cmp al, ah
|
|
je @B
|
|
@@: ; Doesn't match.
|
|
pop esi
|
|
|
|
.next_rec:
|
|
movzx eax, [ebx + EXT2_DIR_STRUC.rec_len]
|
|
add ebx, eax ; Go to next record.
|
|
cmp ebx, edx ; Check if this is the end.
|
|
jb .start_rec
|
|
|
|
add esp, 256
|
|
ret
|
|
|
|
.test_find:
|
|
cmp byte [esi], 0
|
|
je .ret ; The end reached.
|
|
cmp byte [esi], '/' ; If not end of directory name, not matched.
|
|
jne @B
|
|
inc esi
|
|
|
|
.ret:
|
|
add esp, 256 + 4
|
|
ret
|
|
|
|
;---------------------------------------------------------------------
|
|
; Finds free space in a directory block, modifying last entry appropriately.
|
|
; Input: ebp = pointer to EXTFS.
|
|
; ecx = size of free space required.
|
|
; [EXTFS.ext2_temp_block] contains the block relevant.
|
|
; Output: edi = free entry.
|
|
; rec_len of free entry is set.
|
|
; eax = error code; if the block doesn't link to the next one, this is 0x00000001 on failure.
|
|
; ; else, 0xFFFFFFFF.
|
|
;---------------------------------------------------------------------
|
|
ext2_block_find_fspace:
|
|
push ebx edx
|
|
|
|
mov edi, [ebp + EXTFS.ext2_temp_block]
|
|
mov edx, edi
|
|
add edx, [ebp + EXTFS.block_size]
|
|
|
|
@@:
|
|
movzx eax, [edi + EXT2_DIR_STRUC.rec_len]
|
|
test eax, eax
|
|
jz .zero_len
|
|
|
|
cmp [edi + EXT2_DIR_STRUC.inode], 0
|
|
je .unused_entry
|
|
|
|
; It's a used entry, so see if we can fit it between current one and next.
|
|
; Subtract the size used by the name and the structure from rec_len.
|
|
movzx ebx, [edi + EXT2_DIR_STRUC.name_len]
|
|
add ebx, 8 + 3
|
|
and ebx, 0xfffffffc ; Align it on the next 4-byte boundary.
|
|
|
|
sub eax, ebx
|
|
add edi, ebx
|
|
cmp eax, ecx
|
|
jb .next_iter
|
|
|
|
sub edi, ebx
|
|
mov [edi + EXT2_DIR_STRUC.rec_len], bx ; Make previous entry point to us.
|
|
add edi, ebx
|
|
|
|
mov [edi + EXT2_DIR_STRUC.rec_len], ax ; Make current entry point to next one.
|
|
jmp .found
|
|
|
|
.unused_entry:
|
|
; It's an unused inode.
|
|
cmp eax, ecx
|
|
jge .found
|
|
|
|
.next_iter:
|
|
add edi, eax
|
|
cmp edi, edx
|
|
jb @B
|
|
|
|
.not_found:
|
|
xor eax, eax
|
|
not eax
|
|
jmp .ret
|
|
|
|
; Zero length entry means we have the rest of the block for us.
|
|
.zero_len:
|
|
mov eax, edx
|
|
sub eax, edi
|
|
|
|
; Point to next block.
|
|
mov [edi + EXT2_DIR_STRUC.rec_len], ax
|
|
|
|
cmp eax, ecx
|
|
jge .fits
|
|
|
|
mov [edi + EXT2_DIR_STRUC.inode], 0
|
|
|
|
; It doesn't fit, but the block doesn't link to the next block.
|
|
xor eax, eax
|
|
inc eax
|
|
jmp .ret
|
|
|
|
.fits:
|
|
mov [edi + EXT2_DIR_STRUC.rec_len], cx
|
|
|
|
.found:
|
|
xor eax, eax
|
|
|
|
.ret:
|
|
pop edx ebx
|
|
ret
|
|
|
|
;---------------------------------------------------------------------
|
|
; Gets the block group's descriptor.
|
|
; Input: eax = block group.
|
|
; Output: eax = if zero, error; else, points to block group descriptor.
|
|
; [EXTFS.ext2_temp_block] contains relevant block.
|
|
; ebp = pointer to EXTFS.
|
|
;---------------------------------------------------------------------
|
|
ext2_bg_read_desc:
|
|
push edx ebx
|
|
mov edx, 32
|
|
mul edx ; Get index of descriptor in global_desc_table.
|
|
|
|
; eax: block group descriptor offset relative to global descriptor table start
|
|
; Find the block this block descriptor is in.
|
|
div [ebp + EXTFS.block_size]
|
|
add eax, [ebp + EXTFS.superblock + EXT2_SB_STRUC.first_data_block]
|
|
inc eax
|
|
mov ebx, [ebp + EXTFS.ext2_temp_block]
|
|
call ext2_block_read
|
|
test eax, eax
|
|
jnz .fail
|
|
|
|
add ebx, edx ; edx: local index of descriptor inside block
|
|
mov eax, ebx
|
|
|
|
.return:
|
|
pop ebx edx
|
|
ret
|
|
|
|
.fail:
|
|
xor eax, eax
|
|
jmp .return
|
|
|
|
;---------------------------------------------------------------------
|
|
; Writes a block group's descriptor.
|
|
; Input: eax = block group.
|
|
; [EXTFS.ext2_temp_data] contains the block relevant.
|
|
; ebp = pointer to EXTFS.
|
|
; Output: eax = error code.
|
|
;---------------------------------------------------------------------
|
|
ext2_bg_write_desc:
|
|
push edx ebx
|
|
mov edx, 32
|
|
mul edx ; Get index of descriptor in global_desc_table.
|
|
|
|
; eax: block group descriptor offset relative to global descriptor table start
|
|
; Find the block this block descriptor is in.
|
|
div [ebp + EXTFS.block_size]
|
|
add eax, [ebp + EXTFS.superblock + EXT2_SB_STRUC.first_data_block]
|
|
inc eax
|
|
mov ebx, [ebp + EXTFS.ext2_temp_block]
|
|
call ext2_block_write
|
|
|
|
.return:
|
|
pop ebx edx
|
|
ret
|
|
|
|
;---------------------------------------------------------------------
|
|
; Gets the block group's block bitmap.
|
|
; Input: eax = block group.
|
|
; Output: eax = if zero, error; else, points to block group descriptor.
|
|
; ebx = block bitmap's block (hard disk).
|
|
;---------------------------------------------------------------------
|
|
ext2_bg_read_blk_bitmap:
|
|
push ecx
|
|
|
|
call ext2_bg_read_desc
|
|
test eax, eax
|
|
jz .fail
|
|
|
|
mov ebx, [eax + EXT2_BLOCK_GROUP_DESC.block_bitmap] ; Block number of block group bitmap - in ext2 terms.
|
|
|
|
.return:
|
|
pop ecx
|
|
ret
|
|
|
|
.fail:
|
|
xor eax, eax
|
|
jmp .return
|
|
|
|
;---------------------------------------------------------------------
|
|
; Updates superblock, plus backups.
|
|
; Input: ebp = pointer to EXTFS.
|
|
; Output: eax = error code.
|
|
;---------------------------------------------------------------------
|
|
ext2_sb_update:
|
|
push ebx
|
|
|
|
mov eax, 2
|
|
lea ebx, [ebp + EXTFS.superblock]
|
|
call fs_write32_sys
|
|
|
|
pop ebx
|
|
ret
|