;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; ;;
;; Copyright (C) KolibriOS team 2013-2016. All rights reserved. ;;
;; Distributed under terms of the GNU General Public License. ;;
;; ;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
$Revision: 6468 $
; EXT external functions
; in:
; ebx -> parameter structure of sysfunc 70
; ebp -> EXTFS structure
; esi -> path string
; out:
; eax, ebx = return values for sysfunc 70
iglobal
align 4
ext_user_functions:
dd ext_free
dd (ext_user_functions_end - ext_user_functions - 4) / 4
dd ext_ReadFile
dd ext_ReadFolder
dd ext_CreateFile
dd ext_WriteFile
dd ext_SetFileEnd
dd ext_GetFileInfo
dd ext_SetFileInfo
dd 0
dd ext_Delete
dd ext_CreateFolder
ext_user_functions_end:
endg
struct DIRENTRY
inodeNumber dd ?
entryLength dw ?
nameLength db ?
fileType db ?
name db ? ; rb [nameLength]
ends
struct INODE
accessMode dw ?
UID dw ?
fileSize dd ?
accessedTime dd ?
inodeModified dd ?
dataModified dd ?
deletedTime dd ?
GID dw ?
linksCount dw ?
sectorsUsed dd ?
featureFlags dd ?
reserved dd ?
blockNumbers rd 12
addressBlock dd ?
doubleAddress dd ?
tripleAddress dd ?
generation dd ?
ACL dd ?
fileSizeHigh dd ?
ends
struct BGDESCR ; block group descriptor
blockBitmap dd ?
inodeBitmap dd ?
inodeTable dd ?
blocksFree dw ?
inodesFree dw ?
directoriesCount dw ?
reserved rb 14
ends
struct SUPERBLOCK
inodesTotal dd ?
blocksTotal dd ?
blocksReserved dd ?
blocksFree dd ?
inodesFree dd ?
firstGroupBlock dd ?
sectorsPerBlockLog dd ? ; shift for 1024
fragmentSizeLog dd ?
blocksPerGroup dd ?
fragmentsPerGroup dd ?
inodesPerGroup dd ?
lastMountTime dd ?
lastWriteTime dd ?
mountCount dw ?
mountMax dw ?
magic dw ?
state dw ?
errorHandling dw ?
additionalVersion dw ?
lastCheck dd ?
checkInterval dd ?
creatorOS dd ?
dynamicVersionFlag dd ?
reservedUID dw ?
reservedGID dw ?
firstInode dd ?
inodeSize dw ?
thisBlockGroup dw ?
compatibleFlags dd ?
incompatibleFlags dd ?
RO_compatibleFlags dd ?
ends
; ext4 extent tree
struct NODEHEADER ; tree node header
magic dw ? ; 0xF30A
entriesFolow dw ?
entriesMax dw ?
currentDepth dw ?
generation dd ?
ends
struct INDEX ; root/branch
fileBlock dd ?
nodeBlock dd ?
nodeBlockHigh dw ?
reserved dw ?
ends
struct EXTENT ; leaf
fileBlock dd ?
blocksCount dw ?
fsBlockHigh dw ?
fsBlock dd ?
ends
ROOT_INODE = 2
PERMISSIONS = 110110110b
EXTENTS_USED = 80000h
TYPE_MASK = 0F000h
FLAG_FILE = 8000h
DIRECTORY = 4000h
DIR_FLAG_FILE = 1
DIR_DIRECTORY = 2
KOS_HIDDEN = 2
KOS_DIRECTORY = 10h
READ_ONLY = 1
; Implemented "incompatible" features:
; 2 = have file type in directory entry
; 40h = extents
; 200h = flexible block groups
INCOMPATIBLE_SUPPORT = 242h
; Read only support for "incompatible" features:
INCOMPATIBLE_READ_SUPPORT = 240h
; Implemented "read-only" features:
; 1 = sparse superblock
; 2 = 64-bit file size
READ_ONLY_SUPPORT = 3
struct EXTFS PARTITION
Lock MUTEX
mountType dd ?
sectorsPerBlockLog dd ? ; shift for 512
bytesPerBlock dd ?
sectorsPerBlock dd ?
dwordsPerBlock dd ?
dwordsPerBranch dd ? ; dwordsPerBlock ^ 2
mainBlockBuffer dd ?
tempBlockBuffer dd ?
align 512
superblock SUPERBLOCK
align 1024
rootInodeBuffer INODE
align 1024
mainInodeBuffer INODE
align 1024
tempInodeBuffer INODE
ends
; mount if it's a valid EXT partition
ext2_create_partition:
; in:
; ebp -> PARTITION structure
; ebx -> boot sector
; ebx+512 -> buffer
; out:
; eax -> EXTFS structure, 0 = not EXT
push ebx
cmp dword [esi+DISK.MediaInfo.SectorSize], 512
jnz .fail
mov eax, 2
add ebx, 512
call fs_read32_sys
test eax, eax
jnz .fail
cmp [ebx+SUPERBLOCK.magic], 0xEF53
jne .fail
cmp [ebx+SUPERBLOCK.state], 1
jne .fail
test [ebx+SUPERBLOCK.incompatibleFlags], not INCOMPATIBLE_SUPPORT
jnz .fail
cmp [ebx+SUPERBLOCK.sectorsPerBlockLog], 6 ; 64KB
ja .fail
cmp [ebx+SUPERBLOCK.inodeSize], 1024
ja .fail
cmp [ebx+SUPERBLOCK.blocksPerGroup], 0
je .fail
cmp [ebx+SUPERBLOCK.inodesPerGroup], 0
je .fail
stdcall kernel_alloc, 1000h
test eax, eax
jz .fail
mov ecx, dword [ebp+PARTITION.FirstSector]
mov dword [eax+EXTFS.FirstSector], ecx
mov ecx, dword [ebp+PARTITION.FirstSector+4]
mov dword [eax+EXTFS.FirstSector+4], ecx
mov ecx, dword [ebp+PARTITION.Length]
mov dword [eax+EXTFS.Length], ecx
mov ecx, dword [ebp+PARTITION.Length+4]
mov dword [eax+EXTFS.Length+4], ecx
mov ecx, [ebp+PARTITION.Disk]
mov [eax+EXTFS.Disk], ecx
mov [eax+EXTFS.FSUserFunctions], ext_user_functions
push ebp esi edi
mov ebp, eax
lea ecx, [eax+EXTFS.Lock]
call mutex_init
mov esi, ebx
lea edi, [ebp+EXTFS.superblock]
mov ecx, 512/4
rep movsd ; copy superblock
mov ecx, [ebx+SUPERBLOCK.sectorsPerBlockLog]
inc ecx
mov [ebp+EXTFS.sectorsPerBlockLog], ecx
mov eax, 1
shl eax, cl
mov [ebp+EXTFS.sectorsPerBlock], eax
shl eax, 9
mov [ebp+EXTFS.bytesPerBlock], eax
shl eax, 1
push eax
shr eax, 3
mov [ebp+EXTFS.dwordsPerBlock], eax
mul eax
mov [ebp+EXTFS.dwordsPerBranch], eax
call kernel_alloc
test eax, eax
jz .error
mov [ebp+EXTFS.mainBlockBuffer], eax
add eax, [ebp+EXTFS.bytesPerBlock]
mov [ebp+EXTFS.tempBlockBuffer], eax
mov [ebp+EXTFS.mountType], 0
test [ebx+SUPERBLOCK.RO_compatibleFlags], not READ_ONLY_SUPPORT
jnz .read_only
test [ebx+SUPERBLOCK.incompatibleFlags], INCOMPATIBLE_READ_SUPPORT
jz @f
.read_only:
or [ebp+EXTFS.mountType], READ_ONLY
@@: ; read root inode
lea ebx, [ebp+EXTFS.rootInodeBuffer]
mov eax, ROOT_INODE
call readInode
test eax, eax
jnz @f
mov eax, ebp
pop edi esi ebp ebx
ret
@@:
stdcall kernel_free, [ebp+EXTFS.mainBlockBuffer]
.error:
stdcall kernel_free, ebp
pop edi esi ebp
.fail:
pop ebx
xor eax, eax
ret
; unmount EXT partition
ext_free:
; in: eax -> EXTFS structure
push eax
stdcall kernel_free, [eax+EXTFS.mainBlockBuffer]
call kernel_free
ret
extfsWriteBlock:
push fs_write64_sys
jmp @f
; in:
; eax = block number
; ebx -> buffer
extfsReadBlock:
push fs_read64_sys
@@:
push ecx edx
mov ecx, [ebp+EXTFS.sectorsPerBlock]
mul ecx
call dword[esp+8]
pop edx ecx
add esp, 4
test eax, eax
jz @f
movi eax, ERROR_DEVICE
stc
@@:
ret
extfsReadDescriptor:
; in: eax = block group number
; out:
; [ebp+EXTFS.tempBlockBuffer] -> relevant block
; eax -> block group descriptor, 0 = error
push edx ebx
shl eax, 5
xor edx, edx
div [ebp+EXTFS.bytesPerBlock]
add eax, [ebp+EXTFS.superblock.firstGroupBlock]
inc eax
mov ebx, [ebp+EXTFS.tempBlockBuffer]
call extfsReadBlock
jc .fail
mov eax, ebx
add eax, edx
@@:
pop ebx edx
ret
.fail:
xor eax, eax
stc
jmp @b
extfsWriteDescriptor:
; in:
; eax = block group number
; [ebp+EXTFS.tempBlockBuffer] -> relevant block
push edx ebx
shl eax, 5
xor edx, edx
div [ebp+EXTFS.bytesPerBlock]
add eax, [ebp+EXTFS.superblock.firstGroupBlock]
inc eax
mov ebx, [ebp+EXTFS.tempBlockBuffer]
call extfsWriteBlock
pop ebx edx
ret
extfsResourceFree:
; in:
; ecx=0 -> block, ecx=1 -> inode
; eax = block/inode number
push ebx edx
sub eax, [ebp+EXTFS.superblock.firstGroupBlock]
xor edx, edx
div [ebp+EXTFS.superblock.blocksPerGroup]
push eax edx
call extfsReadDescriptor
jc .fail
inc [eax+BGDESCR.blocksFree+ecx*2]
mov eax, [eax+BGDESCR.blockBitmap+ecx*4]
mov ebx, [ebp+EXTFS.mainBlockBuffer]
mov edx, eax
call extfsReadBlock
jc .fail
pop eax
push edx
mov edx, eax
and edx, 31
shr eax, 5
shl eax, 2
add eax, [ebp+EXTFS.mainBlockBuffer]
btr [eax], edx
pop eax
mov ebx, [ebp+EXTFS.mainBlockBuffer]
call extfsWriteBlock
jc @f
inc [ebp+EXTFS.superblock.blocksFree+ecx*4]
pop eax
call extfsWriteDescriptor
.ret:
pop edx ebx
ret
.fail:
pop eax
@@:
pop eax
movi eax, ERROR_DEVICE
jmp .ret
freeDoublyIndirectBlock:
; in: eax = doubly-indirect block number
; out: eax=1 -> finished
test eax, eax
jz .complete
push eax
mov ebx, [ebp+EXTFS.tempBlockBuffer]
call extfsReadBlock
pop eax
jc .ret
xor ecx, ecx
call extfsResourceFree
mov edx, ebx
add edx, [ebp+EXTFS.bytesPerBlock]
@@:
mov eax, [ebx]
test eax, eax
jz .complete
call extfsResourceFree
add ebx, 4
cmp ebx, edx
jb @b
.ret:
xor eax, eax
ret
.complete:
inc eax
ret
inodeBlockAlloc:
; in: esi -> inode
; out: ebx = block number
; TODO: fix to have correct preference.
mov eax, ROOT_INODE
call extfsBlockAlloc
jc @f
mov eax, [ebp+EXTFS.sectorsPerBlock]
add [esi+INODE.sectorsUsed], eax
xor eax, eax
@@:
ret
extfsBlockAlloc: ; also erases
; in: eax = inode number
; out: ebx = block number
xor ebx, ebx
call extfsResourceAlloc
jc @f
push ebx ecx edi
mov ecx, [ebp+EXTFS.dwordsPerBlock]
mov edi, [ebp+EXTFS.tempBlockBuffer]
mov ebx, edi
xor eax, eax
rep stosd
pop edi ecx
mov eax, [esp]
call extfsWriteBlock
pop ebx
@@:
ret
extfsResourceAlloc:
; in:
; eax = inode number
; ebx=0 -> block, ebx=1 -> inode
; out:
; ebx = block/inode number
push ecx edx esi edi
dec eax
xor edx, edx
div [ebp+EXTFS.superblock.inodesPerGroup]
push eax eax
mov esi, .forward ; search forward, then backward
.test_block_group:
call extfsReadDescriptor
jc .fail
dec [eax+BGDESCR.blocksFree+ebx*2]
mov eax, [eax+BGDESCR.blockBitmap+ebx*4]
push ebx
mov ebx, [ebp+EXTFS.mainBlockBuffer]
mov edx, eax
mov edi, ebx
call extfsReadBlock
pop ebx
jc .fail
mov ecx, [ebp+EXTFS.superblock.blocksPerGroup+ebx*8]
or eax, -1
shr ecx, 5
jz .next
repz scasd
jz .next
sub edi, 4
mov eax, [edi]
not eax
bsf eax, eax
bts [edi], eax
sub edi, [ebp+EXTFS.mainBlockBuffer]
shl edi, 3
add eax, edi
mov ecx, eax
mov eax, edx
push ebx
mov ebx, [ebp+EXTFS.mainBlockBuffer]
call extfsWriteBlock
pop ebx
jc .fail
mov eax, [esp]
mul [ebp+EXTFS.superblock.blocksPerGroup+ebx*8]
add eax, ecx
dec [ebp+EXTFS.superblock.blocksFree+ebx*4]
mov ebx, eax
pop eax
add esp, 4
call extfsWriteDescriptor
@@:
pop edi esi edx ecx
ret
.fail:
pop eax eax
movi eax, ERROR_DEVICE
jmp @b
.next:
jmp esi
.forward:
inc dword[esp]
mov eax, [esp]
mul [ebp+EXTFS.superblock.blocksPerGroup+ebx*8]
neg ebx
cmp eax, [ebp+EXTFS.superblock.blocksTotal+ebx*4]
ja @f
neg ebx
mov eax, [esp]
jmp .test_block_group
@@:
neg ebx
mov eax, [esp+4]
mov [esp], eax
mov esi, .backward
.backward:
sub dword[esp], 1
jc .fail
mov eax, [esp]
jmp .test_block_group
extfsGetFileBlock:
; in:
; ecx = file block number
; esi -> inode
; out:
; ecx = block number
test [esi+INODE.featureFlags], EXTENTS_USED
jz .listTreeSearch
pushad
add esi, INODE.blockNumbers
.extentTreeSearch:
cmp word [esi+NODEHEADER.magic], 0xF30A
jne .fail
movzx ebx, [esi+NODEHEADER.entriesFolow]
add esi, sizeof.NODEHEADER
cmp word [esi-sizeof.NODEHEADER+NODEHEADER.currentDepth], 0
je .leaf_block
test ebx, ebx
jz .fail ; empty
@@:
cmp ebx, 1
je .end_search_index
cmp ecx, [esi+INDEX.fileBlock]
jb .fail
cmp ecx, [esi+sizeof.INDEX+INDEX.fileBlock]
jb .end_search_index
add esi, sizeof.INDEX
dec ebx
jmp @b
.end_search_index:
mov ebx, [ebp+EXTFS.tempBlockBuffer]
mov eax, [esi+INDEX.nodeBlock]
call extfsReadBlock
jc .fail
mov esi, ebx
jmp .extentTreeSearch
.leaf_block:
test ebx, ebx
jz .fail
mov edx, [esi+EXTENT.fileBlock]
cmp ecx, edx
jb .fail
movzx edi, [esi+EXTENT.blocksCount]
add edx, edi
cmp ecx, edx
jb .end_search_extent
add esi, sizeof.EXTENT
dec ebx
jmp .leaf_block
.end_search_extent:
sub ecx, [esi+EXTENT.fileBlock]
add ecx, [esi+EXTENT.fsBlock]
mov PUSHAD_ECX, ecx
popad
xor eax, eax
ret
.fail:
popad
movi eax, ERROR_FS_FAIL
stc
ret
.get_indirect_block:
push edx ebx
mov eax, [esi+INODE.addressBlock]
test eax, eax
jz .fail3
mov ebx, [ebp+EXTFS.tempBlockBuffer]
call extfsReadBlock
jc @f
mov ecx, [ebx+ecx*4]
@@:
pop ebx edx
ret
.get_direct_block:
mov ecx, [esi+INODE.blockNumbers+ecx*4]
xor eax, eax
ret
.listTreeSearch:
cmp ecx, 12
jb .get_direct_block
sub ecx, 12
cmp ecx, [ebp+EXTFS.dwordsPerBlock]
jb .get_indirect_block
sub ecx, [ebp+EXTFS.dwordsPerBlock]
cmp ecx, [ebp+EXTFS.dwordsPerBranch]
jb .get_double_indirect_block
; triply-indirect blocks
sub ecx, [ebp+EXTFS.dwordsPerBranch]
push edx ebx
mov eax, [esi+INODE.tripleAddress]
mov ebx, [ebp+EXTFS.tempBlockBuffer]
call extfsReadBlock
jc .fail2
xor edx, edx
mov eax, ecx
div [ebp+EXTFS.dwordsPerBranch]
; eax = number in triply-indirect block, edx = number in branch
mov eax, [ebx+eax*4]
test eax, eax
jz .fail3
call extfsReadBlock
jc .fail2
mov eax, edx
jmp @f
.fail3:
pop ebx edx
movi eax, ERROR_FS_FAIL
stc
ret
.get_double_indirect_block:
push edx ebx
mov eax, [esi+INODE.doubleAddress]
test eax, eax
jz .fail3
mov ebx, [ebp+EXTFS.tempBlockBuffer]
call extfsReadBlock
jc .fail2
mov eax, ecx
@@:
xor edx, edx
div [ebp+EXTFS.dwordsPerBlock]
; eax = number in doubly-indirect block, edx = number in indirect block
mov eax, [ebx+eax*4]
test eax, eax
jz .fail3
call extfsReadBlock
jc .fail2
mov ecx, [ebx+edx*4]
.fail2:
pop ebx edx
ret
extfsSetFileBlock:
; in:
; ecx = file block number
; edi = block number
; esi -> inode
push ebx ecx edx
cmp ecx, 12
jb .direct_block
sub ecx, 12
cmp ecx, [ebp+EXTFS.dwordsPerBlock]
jb .indirect_block
sub ecx, [ebp+EXTFS.dwordsPerBlock]
cmp ecx, [ebp+EXTFS.dwordsPerBranch]
jb .double_indirect_block
; triple indirect blocks
sub ecx, [ebp+EXTFS.dwordsPerBranch]
mov eax, [esi+INODE.tripleAddress]
test eax, eax
jnz @f
call inodeBlockAlloc
jc .ret
mov [esi+INODE.tripleAddress], ebx
mov eax, ebx
@@:
push eax
mov ebx, [ebp+EXTFS.tempBlockBuffer]
call extfsReadBlock
jc .fail_alloc_4
xor edx, edx
mov eax, ecx
div [ebp+EXTFS.dwordsPerBranch]
; eax = number in triply-indirect block, edx = number in branch
lea ecx, [ebx+eax*4]
mov eax, [ebx+eax*4]
test eax, eax
jnz @f
call inodeBlockAlloc
jc .fail_alloc_4
mov [ecx], ebx
mov eax, [esp]
mov ebx, [ebp+EXTFS.tempBlockBuffer]
call extfsWriteBlock
jc .fail_alloc_4
mov eax, [ecx]
@@:
mov [esp], eax
call extfsReadBlock
jc .fail_alloc_4
mov eax, edx
jmp @f
.double_indirect_block:
mov eax, [esi+INODE.doubleAddress]
test eax, eax
jnz .double_indirect_present
call inodeBlockAlloc
jc .ret
mov [esi+INODE.doubleAddress], ebx
mov eax, ebx
.double_indirect_present:
push eax
mov ebx, [ebp+EXTFS.tempBlockBuffer]
call extfsReadBlock
jc .fail_alloc_4
mov eax, ecx
@@:
xor edx, edx
div [ebp+EXTFS.dwordsPerBlock]
; eax = number in doubly-indirect block, edx = number in indirect block
lea ecx, [ebx+edx*4]
push ecx
lea ecx, [ebx+eax*4]
cmp dword[ecx], 0
jne @f
call inodeBlockAlloc
jc .fail_alloc_8
mov [ecx], ebx
mov eax, [esp+4]
mov ebx, [ebp+EXTFS.tempBlockBuffer]
call extfsWriteBlock
jc .fail_alloc_8
@@:
mov eax, [ecx]
push eax
call extfsReadBlock
jc .fail_alloc_12
pop eax ecx edx
mov [ecx], edi
call extfsWriteBlock
jmp .ret
.indirect_block:
mov eax, [esi+INODE.addressBlock]
test eax, eax
jnz @f
call inodeBlockAlloc
jc .ret
mov [esi+INODE.addressBlock], ebx
mov eax, ebx
@@:
push eax
mov ebx, [ebp+EXTFS.tempBlockBuffer]
call extfsReadBlock
jc .fail_alloc_4
mov [ebx+ecx*4], edi
pop eax
call extfsWriteBlock
jmp .ret
.direct_block:
mov [esi+INODE.blockNumbers+ecx*4], edi
xor eax, eax
.ret:
pop edx ecx ebx
ret
.fail_alloc_12:
pop ebx
.fail_alloc_8:
pop ebx
.fail_alloc_4:
pop ebx
jmp .ret
extfsEraseFileBlock: ; also allocates
; in:
; edx = inode number
; eax = file block number
; [ebp+EXTFS.tempInodeBuffer] = inode
push ebx ecx edx edi esi
mov edi, eax
mov ecx, eax
lea esi, [ebp+EXTFS.tempInodeBuffer]
call extfsGetFileBlock
jc @f
test ecx, ecx
jz .allocate
mov edx, ecx
mov ecx, [ebp+EXTFS.bytesPerBlock]
mov edi, [ebp+EXTFS.tempBlockBuffer]
xor eax, eax
rep stosb
mov eax, edx
mov ebx, [ebp+EXTFS.tempBlockBuffer]
call extfsWriteBlock
jmp @f
.allocate:
mov eax, edx
call extfsBlockAlloc
jc @f
mov ecx, edi
mov edi, ebx
lea esi, [ebp+EXTFS.tempInodeBuffer]
call extfsSetFileBlock
jc @f
mov eax, [ebp+EXTFS.sectorsPerBlock]
add [esi+INODE.sectorsUsed], eax
xor eax, eax
@@:
pop esi edi edx ecx ebx
ret
extfsFreeFileBlock:
; in:
; eax = file block number
; [ebp+EXTFS.tempInodeBuffer] = inode
push ebx ecx edi esi
mov edi, eax
mov ecx, eax
lea esi, [ebp+EXTFS.tempInodeBuffer]
call extfsGetFileBlock
jc @f
test ecx, ecx
jz @f
mov eax, ecx
xor ecx, ecx
call extfsResourceFree
mov ecx, edi
xor edi, edi
lea esi, [ebp+EXTFS.tempInodeBuffer]
call extfsSetFileBlock
mov eax, [ebp+EXTFS.sectorsPerBlock]
sub [esi+INODE.sectorsUsed], eax
xor eax, eax
@@:
pop esi edi ecx ebx
ret
extfsReadFileBlock:
; in:
; eax = file block number
; [ebp+EXTFS.tempInodeBuffer] = inode
; out:
; [ebp+EXTFS.mainBlockBuffer] -> block
push ebx ecx edx esi
mov ecx, eax
lea esi, [ebp+EXTFS.tempInodeBuffer]
call extfsGetFileBlock
jc .ret
test ecx, ecx
jz @f
mov eax, ecx
mov ebx, [ebp+EXTFS.mainBlockBuffer]
call extfsReadBlock
.ret:
pop esi edx ecx ebx
ret
@@:
movi eax, ERROR_FS_FAIL
stc
jmp .ret
extfsWriteFileBlock:
; in:
; eax = file block number
; [ebp+EXTFS.tempInodeBuffer] = inode
; [ebp+EXTFS.mainBlockBuffer] -> block to write
push ebx ecx edx esi
mov ecx, eax
lea esi, [ebp+EXTFS.tempInodeBuffer]
call extfsGetFileBlock
jc @f
test ecx, ecx
jz @b
mov eax, ecx
mov ebx, [ebp+EXTFS.mainBlockBuffer]
call extfsWriteBlock
@@:
pop esi edx ecx ebx
ret
getInodeLocation:
; in: eax = inode number
; out:
; ebx = inode sector
; edx = offset in sector
dec eax
xor edx, edx
div [ebp+EXTFS.superblock.inodesPerGroup]
mov ecx, edx
shl eax, 5
xor edx, edx
div [ebp+EXTFS.bytesPerBlock]
add eax, [ebp+EXTFS.superblock.firstGroupBlock]
inc eax
mov ebx, [ebp+EXTFS.tempBlockBuffer]
call extfsReadBlock
jc @f
add ebx, edx
mov ebx, [ebx+BGDESCR.inodeTable]
mov eax, ecx
mov ecx, [ebp+EXTFS.sectorsPerBlockLog]
shl ebx, cl
mul [ebp+EXTFS.superblock.inodeSize]
mov edx, eax
shr eax, 9
and edx, 511
add ebx, eax
xor eax, eax
@@:
ret
writeInode:
; in:
; eax = inode number
; ebx -> inode data
push edx edi esi ecx ebx eax
mov edi, ebx
call fsGetTime
add eax, 978307200
mov [edi+INODE.inodeModified], eax
pop eax
call getInodeLocation
jc .ret
mov eax, ebx
mov ebx, [ebp+EXTFS.tempBlockBuffer]
mov ecx, eax
call fs_read32_sys
test eax, eax
jnz @f
mov eax, ecx
mov esi, edi
movzx ecx, [ebp+EXTFS.superblock.inodeSize]
mov edi, edx
add edi, ebx
rep movsb
call fs_write32_sys
.ret:
pop ebx ecx esi edi edx
ret
@@:
movi eax, ERROR_DEVICE
stc
jmp .ret
readInode:
; in:
; eax = inode number
; ebx -> inode buffer
push edx edi esi ecx ebx
mov edi, ebx
call getInodeLocation
jc @f
mov eax, ebx
mov ebx, [ebp+EXTFS.tempBlockBuffer]
call fs_read32_sys
test eax, eax
jnz @b
movzx ecx, [ebp+EXTFS.superblock.inodeSize]
mov esi, edx
add esi, ebx
rep movsb
xor eax, eax
@@:
pop ebx ecx esi edi edx
ret
extfsExtendFile:
; in:
; eax = inode number
; ecx = new size
push ebx ecx edx esi edi eax
lea ebx, [ebp+EXTFS.tempInodeBuffer]
call readInode
jc .ret
cmp [ebx+INODE.fileSize], ecx
jnc .ret
mov eax, [ebx+INODE.fileSize]
push eax
sub ecx, eax
xor edx, edx
div [ebp+EXTFS.bytesPerBlock]
test edx, edx
jz .start_aligned
mov esi, [ebp+EXTFS.bytesPerBlock]
sub esi, edx
cmp esi, ecx
jbe @f
mov esi, ecx
@@: ; clear esi trailing bytes in block number eax
push eax
call extfsReadFileBlock
pop edi
jc .error_inode_size
push edi ecx
xor eax, eax
mov ecx, esi
mov edi, ebx
add edi, edx
rep stosb
pop ecx eax
call extfsWriteFileBlock
jc .error_inode_size
add [esp], esi
sub ecx, esi
jz .write_inode
.start_aligned:
cmp ecx, [ebp+EXTFS.bytesPerBlock]
jb @f
mov eax, [esp]
xor edx, edx
div [ebp+EXTFS.bytesPerBlock]
mov edx, [esp+4]
call extfsEraseFileBlock
jc .error_inode_size
mov eax, [ebp+EXTFS.bytesPerBlock]
sub ecx, eax
add [esp], eax
jmp .start_aligned
@@: ; handle the remaining bytes
test ecx, ecx
jz .write_inode
mov eax, [esp]
xor edx, edx
div [ebp+EXTFS.bytesPerBlock]
mov edx, [esp+4]
call extfsEraseFileBlock
jc .error_inode_size
add [esp], ecx
.write_inode:
xor eax, eax
.error_inode_size:
lea ebx, [ebp+EXTFS.tempInodeBuffer]
pop [ebx+INODE.fileSize]
push eax
mov eax, [esp+4]
call writeInode
pop ebx
jc .ret
xchg eax, ebx
cmp ebx, eax ; set CF
.ret:
pop edi edi esi edx ecx ebx
ret
extfsTruncateFile:
; in:
; eax = inode number
; ecx = new size
push ebx ecx edx esi edi eax
lea ebx, [ebp+EXTFS.tempInodeBuffer]
call readInode
jc .ret
cmp ecx, [ebx+INODE.fileSize]
jnc .ret
mov eax, [ebx+INODE.fileSize]
push eax
sub ecx, eax
not ecx
inc ecx
xor edx, edx
div [ebp+EXTFS.bytesPerBlock]
test edx, edx
jz .start_aligned
mov esi, edx
cmp esi, ecx
jbe @f
; if the size to truncate is smaller than the unaligned bytes
; we're going to clear neccessary bytes from the EOF
push eax
call extfsReadFileBlock
pop edi
jc .error_inode_size
push edi ecx
mov edi, [ebp+EXTFS.mainBlockBuffer]
sub edx, ecx
add edi, edx
xor eax, eax
rep stosb
pop ecx eax
call extfsWriteFileBlock
jc .error_inode_size
sub [esp], ecx
jmp .write_inode
@@:
call extfsFreeFileBlock
sub [esp], esi
sub ecx, esi
jz .write_inode
.start_aligned:
cmp ecx, [ebp+EXTFS.bytesPerBlock]
jb @f
mov eax, [esp]
xor edx, edx
div [ebp+EXTFS.bytesPerBlock]
dec eax
call extfsFreeFileBlock
mov eax, [ebp+EXTFS.bytesPerBlock]
sub ecx, eax
sub [esp], eax
jmp .start_aligned
@@: ; handle the remaining bytes
test ecx, ecx
jz .write_inode
mov eax, [esp]
xor edx, edx
div [ebp+EXTFS.bytesPerBlock]
dec eax
push eax
call extfsReadFileBlock
pop edi
jc .error_inode_size
push edi ecx
mov edi, [ebp+EXTFS.mainBlockBuffer]
mov edx, [ebp+EXTFS.bytesPerBlock]
sub edx, ecx
add edi, edx
xor eax, eax
rep stosb
pop ecx eax
call extfsWriteFileBlock
jc .error_inode_size
sub [esp], ecx
.write_inode:
xor eax, eax
.error_inode_size:
lea ebx, [ebp+EXTFS.tempInodeBuffer]
pop [ebx+INODE.fileSize]
push eax
mov eax, [esp+4]
call writeInode
pop ebx
jc .ret
xchg eax, ebx
cmp ebx, eax ; set CF
.ret:
pop edi edi esi edx ecx ebx
ret
linkInode:
; in:
; eax = inode on which to link
; ebx = inode to link
; esi -> name
; dl = file type
push esi edi ebx ecx eax edx
call strlen
add ecx, 8 ; directory entry size
push esi ebx ecx
xor ecx, ecx
lea esi, [ebp+EXTFS.tempInodeBuffer]
mov ebx, esi
call readInode
jc .error_inode_read
mov ecx, [ebp+EXTFS.sectorsPerBlockLog]
mov eax, [esi+INODE.sectorsUsed]
shr eax, cl
xor ecx, ecx
push eax ; maximum file block number
push ecx ; current file block number
.searchBlock:
call extfsGetFileBlock
jc .error_get_inode_block
test ecx, ecx
jz .alloc_block
push ecx
mov eax, ecx
mov ebx, [ebp+EXTFS.tempBlockBuffer]
call extfsReadBlock
jc .error_block_read
mov ecx, [esp+8]
mov edi, [ebp+EXTFS.tempBlockBuffer]
mov edx, edi
add edx, [ebp+EXTFS.bytesPerBlock]
.searchSpace:
movzx eax, [edi+DIRENTRY.entryLength]
test eax, eax
jz .zeroLength
cmp [edi+DIRENTRY.inodeNumber], 0
je .unusedEntry
movzx ebx, [edi+DIRENTRY.nameLength]
add ebx, 8+3
and ebx, -4
sub eax, ebx
add edi, ebx
cmp eax, ecx
jb .nextEntry
sub edi, ebx
mov [edi+DIRENTRY.entryLength], bx
add edi, ebx
mov [edi+DIRENTRY.entryLength], ax
jmp .found
.unusedEntry:
cmp eax, ecx
jge .found
.nextEntry:
add edi, eax
cmp edi, edx
jb .searchSpace
jmp .nextBlock
.zeroLength:
mov [edi+DIRENTRY.entryLength], cx
mov eax, edx
sub eax, edi
cmp eax, ecx
jge .found
mov [edi+DIRENTRY.inodeNumber], 0
mov [edi+DIRENTRY.entryLength], ax
; this block wasn't linking to the next one, so write it, and use the next block
pop eax
mov ebx, [ebp+EXTFS.tempBlockBuffer]
call extfsWriteBlock
jc .error_get_inode_block
inc dword[esp]
mov ecx, [esp]
call extfsGetFileBlock
jc .error_get_inode_block
test ecx, ecx
jz .alloc_block
push ecx
jmp .prepare_block
.nextBlock:
add esp, 4
inc dword[esp]
mov ecx, [esp]
cmp ecx, [esp+4]
jbe .searchBlock
.alloc_block:
mov eax, [esp+12]
call extfsBlockAlloc
jc .error_get_inode_block
mov ecx, [esp]
mov edi, ebx
call extfsSetFileBlock
jc .error_get_inode_block
mov eax, [ebp+EXTFS.bytesPerBlock]
add [esi+INODE.fileSize], eax
mov eax, [ebp+EXTFS.sectorsPerBlock]
add [esi+INODE.sectorsUsed], eax
mov eax, [esp+24]
mov ebx, esi
call writeInode
jc .error_get_inode_block
push edi ; save the block we just allocated
.prepare_block:
mov eax, [esp]
mov ebx, [ebp+EXTFS.tempBlockBuffer]
call extfsReadBlock
jc .error_block_read
mov edi, ebx
mov eax, [ebp+EXTFS.bytesPerBlock]
mov [edi+DIRENTRY.entryLength], ax
.found:
pop edx ecx ecx ecx ebx esi
push ebx
mov [edi], ebx ; save inode
mov eax, [esp+4]
cmp [ebp+EXTFS.superblock.dynamicVersionFlag], 0
je .name
mov [edi+DIRENTRY.fileType], al
.name:
sub ecx, 8
mov [edi+DIRENTRY.nameLength], cl
add edi, 8
rep movsb
mov eax, edx
mov ebx, [ebp+EXTFS.tempBlockBuffer]
call extfsWriteBlock
jc .error_block_write
mov eax, [esp]
lea ebx, [ebp+EXTFS.tempInodeBuffer]
call readInode
jc .error_block_write
pop eax
inc [ebx+INODE.linksCount]
call writeInode
jc @f
xor eax, eax
@@:
pop edx ecx ecx ebx edi esi
ret
.error_block_read:
pop ebx
.error_get_inode_block:
pop ebx ebx
.error_inode_read:
pop ebx ebx
.error_block_write:
pop ebx
jmp @b
unlinkInode:
; in:
; eax = inode from which to unlink
; ebx = inode to unlink
; out:
; eax = current number of links to inode, -1 = error
push edx esi edi ebx
lea ebx, [ebp+EXTFS.tempInodeBuffer]
call readInode
jc .fail
push eax
lea esi, [ebp+EXTFS.tempInodeBuffer]
.loop:
mov ecx, [esp]
call extfsGetFileBlock
jc .fail_loop
test ecx, ecx
jz .fail_loop
mov eax, ecx
mov edi, ecx
mov ebx, [ebp+EXTFS.tempBlockBuffer]
call extfsReadBlock
jc .fail_loop
.first_dir_entry: ; edi -> block
mov eax, [esp+4]
cmp [ebx+DIRENTRY.inodeNumber], eax
jne @f
mov [ebx+DIRENTRY.inodeNumber], 0
mov word [ebx+DIRENTRY.nameLength], 0 ; fileType = 0
jmp .write_block
@@:
mov edx, ebx
add edx, [ebp+EXTFS.bytesPerBlock]
push edx
mov edx, ebx
movzx ecx, [ebx+DIRENTRY.entryLength]
add ebx, ecx
.dir_entry:
cmp [ebx+DIRENTRY.inodeNumber], eax
jne @f
mov cx, [ebx+DIRENTRY.entryLength]
add [edx+DIRENTRY.entryLength], cx
pop eax
jmp .write_block
@@:
mov edx, ebx
movzx ecx, [ebx+DIRENTRY.entryLength]
test ecx, ecx
jz .fail_inode
add ebx, ecx
cmp ebx, [esp]
jb .dir_entry
pop ecx
inc dword[esp]
jmp .loop
.fail_inode:
pop eax
.fail_loop:
pop eax
.fail:
or eax, -1
jmp @f
.write_block:
pop eax
mov eax, edi
mov ebx, [ebp+EXTFS.tempBlockBuffer]
call extfsWriteBlock
jc .fail
mov eax, [esp]
lea ebx, [ebp+EXTFS.tempInodeBuffer]
call readInode
jc .fail
dec word [ebx+INODE.linksCount]
mov eax, [esp]
call writeInode
jc .fail
movzx eax, word [ebx+INODE.linksCount]
@@:
pop ebx edi esi edx
ret
findInode_parent:
; in: esi -> path
; out:
; edi -> file name
; esi = inode
push esi
xor edi, edi
.loop:
cmp byte [esi], '/'
jne @f
mov edi, esi
inc esi
jmp .loop
@@:
inc esi
cmp byte [esi-1], 0
jne .loop
cmp edi, 0
jne @f
; parent is root
pop edi
dec esi
jmp .get_inode
@@: ; parent is folder
mov byte [edi], 0
inc edi
pop esi
.get_inode:
push ebx edx
call findInode
pop edx ebx
ret
findInode:
; in: esi -> path string
; out:
; [ebp+EXTFS.mainInodeBuffer] = inode
; esi = inode number
; dl = first byte of file/folder name
lea edx, [ebp+EXTFS.rootInodeBuffer]
cmp [edx+INODE.sectorsUsed], 0
je .not_found
cmp byte [esi], 0
jne .next_path_part
; root
push edi ecx
lea esi, [ebp+EXTFS.rootInodeBuffer]
lea edi, [ebp+EXTFS.mainInodeBuffer]
movzx ecx, [ebp+EXTFS.superblock.inodeSize]
rep movsb
pop ecx edi
xor eax, eax
xor dl, dl
mov esi, ROOT_INODE
ret
.next_path_part:
push [edx+INODE.sectorsUsed]
xor ecx, ecx
.folder_block_cycle:
push ecx
xchg esi, edx
call extfsGetFileBlock
jc .error_get_block
xchg esi, edx
mov eax, ecx
mov ebx, [ebp+EXTFS.mainBlockBuffer]
call extfsReadBlock
jc .error_get_block
push esi edx
sub esp, 256
mov edx, ebx
add edx, [ebp+EXTFS.bytesPerBlock]
.start_rec:
cmp [ebx+DIRENTRY.inodeNumber], 0
jz .next_rec
mov edi, esp
push esi
movzx ecx, [ebx+DIRENTRY.nameLength]
lea esi, [ebx+DIRENTRY.name]
call utf8_to_cp866
mov ecx, edi
lea edi, [esp+4]
sub ecx, edi ; number of bytes in resulting string
mov esi, [esp]
@@: ; edi -> converted string in stack, ecx = size, esi -> original file path
jecxz .test_find
dec ecx
lodsb
call char_toupper
mov ah, [edi]
inc edi
xchg al, ah
call char_toupper
cmp al, ah
je @b
@@: ; doesn't match
pop esi
.next_rec:
movzx eax, [ebx+DIRENTRY.entryLength]
add ebx, eax
cmp ebx, edx
jb .start_rec
push eax
jmp @f
.test_find:
cmp byte [esi], 0
je @f
cmp byte [esi], '/'
jne @b
inc esi
@@:
add esp, 256+4
pop edx edi ecx
; ebx -> matched directory entry, esi -> name without parent, or not changed
cmp edi, esi
je .next_folder_block
cmp byte [esi], 0
je .get_inode_ret
mov eax, [ebx+DIRENTRY.inodeNumber]
lea ebx, [ebp+EXTFS.mainInodeBuffer]
call readInode
jc .error_get_inode
movzx eax, [ebx+INODE.accessMode]
and eax, TYPE_MASK
cmp eax, DIRECTORY
jne .not_found ; path folder is a file
pop ecx
mov edx, ebx
jmp .next_path_part
.next_folder_block:
pop eax
sub eax, [ebp+EXTFS.sectorsPerBlock]
jle .not_found
push eax
inc ecx
jmp .folder_block_cycle
.get_inode_ret:
pop eax
mov dl, [ebx+DIRENTRY.name]
mov eax, [ebx+DIRENTRY.inodeNumber]
lea ebx, [ebp+EXTFS.mainInodeBuffer]
mov esi, eax
call readInode
ret
.not_found:
movi eax, ERROR_FILE_NOT_FOUND
stc
ret
.error_get_block:
pop ebx
.error_get_inode:
pop ebx
ret
writeSuperblock:
push ebx
mov eax, 2
lea ebx, [ebp+EXTFS.superblock]
call fs_write32_sys
pop ebx
ret
extfsWritingInit:
movi eax, ERROR_ACCESS_DENIED
cmp byte [esi], 0
jz @f
movi eax, ERROR_UNSUPPORTED_FS
test [ebp+EXTFS.mountType], READ_ONLY
jnz @f
ext_lock:
lea ecx, [ebp+EXTFS.Lock]
jmp mutex_lock
@@:
pop ebx
xor ebx, ebx
ret
ext_unlock:
lea ecx, [ebp+EXTFS.Lock]
jmp mutex_unlock
;----------------------------------------------------------------
ext_ReadFolder:
call ext_lock
cmp byte [esi], 0
jz .root_folder
push ebx
call findInode
pop ebx
jc .error_ret
lea esi, [ebp+EXTFS.mainInodeBuffer]
test [esi+INODE.accessMode], DIRECTORY
jz .error_not_found
jmp @f
.root_folder:
lea esi, [ebp+EXTFS.rootInodeBuffer]
lea edi, [ebp+EXTFS.mainInodeBuffer]
movzx ecx, [ebp+EXTFS.superblock.inodeSize]
shr ecx, 2
push edi
rep movsd
pop esi
@@:
cmp [esi+INODE.fileSize], 0
je .error_empty_dir
mov edx, [ebx+16]
push edx ; [edi+28] result buffer
push 0 ; [edi+24] end of the current block in folder
pushd [ebx+12] ; [edi+20] files to read
pushd [ebx+4] ; [edi+16] first wanted file
pushd [ebx+8] ; [edi+12] flags
push 0 ; [edi+8] read files
push 0 ; [edi+4] files in folder
push 0 ; [edi] current block index
mov edi, esp ; edi -> local variables
add edx, 32
xor ecx, ecx
call extfsGetFileBlock
jc .error_get_block
mov eax, ecx
mov ebx, [ebp+EXTFS.mainBlockBuffer]
call extfsReadBlock
jc .error_get_block
mov eax, ebx
add eax, [ebp+EXTFS.bytesPerBlock]
mov [edi+24], eax
mov ecx, [edi+16]
.find_wanted_start:
jecxz .find_wanted_end
.find_wanted_cycle:
cmp [ebx+DIRENTRY.inodeNumber], 0
jz @f
inc dword [edi+4]
dec ecx
@@:
movzx eax, [ebx+DIRENTRY.entryLength]
cmp eax, 12 ; minimum entry length
jb .error_bad_len
test eax, 3 ; length must be aligned
jnz .error_bad_len
sub [esi+INODE.fileSize], eax
add ebx, eax
cmp ebx, [edi+24]
jb .find_wanted_start
push .find_wanted_start
.end_block: ; read next block
cmp [esi+INODE.fileSize], 0
jle .end_dir
inc dword [edi]
push ecx
mov ecx, [edi]
call extfsGetFileBlock
jc .error_get_block
mov eax, ecx
mov ebx, [ebp+EXTFS.mainBlockBuffer]
call extfsReadBlock
jc .error_get_block
pop ecx
mov eax, ebx
add eax, [ebp+EXTFS.bytesPerBlock]
mov [edi+24], eax
ret
.wanted_end:
loop .find_wanted_cycle
.find_wanted_end:
mov ecx, [edi+20]
.wanted_start:
jecxz .wanted_end
cmp [ebx+DIRENTRY.inodeNumber], 0
jz .empty_rec
inc dword [edi+8]
inc dword [edi+4]
push ebx edi ecx esi edx
mov edi, edx
xor eax, eax
mov ecx, 40 / 4
rep stosd
mov eax, [ebx+DIRENTRY.inodeNumber]
lea ebx, [ebp+EXTFS.tempInodeBuffer]
call readInode
jc .error_read_subinode
mov esi, ebx
lea edi, [edx+8]
mov eax, [ebx+INODE.inodeModified]
sub eax, 978307200 ; 01.01.1970-01.01.2001 = (365*31+8)*24*60*60
call fsTime2bdfe
mov eax, [esi+INODE.accessedTime]
sub eax, 978307200
call fsTime2bdfe
mov eax, [esi+INODE.dataModified]
sub eax, 978307200
call fsTime2bdfe
pop edx
or dword [edx], KOS_DIRECTORY
test [esi+INODE.accessMode], DIRECTORY
jnz @f
xor dword [edx], KOS_DIRECTORY ; mark as file
mov eax, [esi+INODE.fileSize]
stosd
mov eax, [esi+INODE.fileSizeHigh]
stosd
@@:
mov esi, [esp+12]
movzx ecx, [esi+DIRENTRY.nameLength]
lea edi, [edx+40]
lea esi, [esi+DIRENTRY.name]
call utf8_to_cp866
and byte [edi], 0
pop esi ecx edi ebx
cmp byte [edx+40], '.'
jne @f
or dword [edx], KOS_HIDDEN
@@:
add edx, 40+264 ; go to the next record
dec ecx
.empty_rec:
movzx eax, [ebx+DIRENTRY.entryLength]
cmp eax, 12
jb .error_bad_len
test eax, 3
jnz .error_bad_len
sub [esi+INODE.fileSize], eax
add ebx, eax
cmp ebx, [edi+24]
jb .wanted_start
push .wanted_start
jmp .end_block
.end_dir:
call ext_unlock
mov edx, [edi+28]
mov ebx, [edi+8]
mov ecx, [edi+4]
mov dword [edx], 1 ; version
mov [edx+4], ebx
mov [edx+8], ecx
lea esp, [edi+32]
mov ecx, 20/4
lea edi, [edx+12]
xor eax, eax
rep stosd
ret
.error_bad_len:
movi eax, ERROR_FS_FAIL
.error_read_subinode:
.error_get_block:
lea esp, [edi+32]
.error_ret:
or ebx, -1
push eax
call ext_unlock
pop eax
ret
.error_empty_dir:
movi eax, ERROR_FS_FAIL
jmp .error_ret
.error_not_found:
movi eax, ERROR_FILE_NOT_FOUND
jmp .error_ret
;----------------------------------------------------------------
ext_ReadFile:
call ext_lock
push ERROR_ACCESS_DENIED
cmp byte [esi], 0
jz .error ; root
mov [esp], ebx
call findInode
pop ebx
jc .error_eax
push ERROR_ACCESS_DENIED
lea esi, [ebp+EXTFS.mainInodeBuffer]
mov ax, [esi+INODE.accessMode]
and ax, TYPE_MASK
cmp ax, FLAG_FILE
jnz .error ; not a file
pop eax
mov edi, [ebx+16]
mov ecx, [ebx+12]
mov eax, [ebx+4]
mov edx, [ebx+8]
push ERROR_END_OF_FILE
cmp [esi+INODE.fileSizeHigh], edx
ja @f
jb .error
cmp [esi+INODE.fileSize], eax
jna .error
@@:
add esp, 4
add eax, ecx
adc edx, 0
cmp [esi+INODE.fileSizeHigh], edx
ja .read_till_requested
jb .read_whole_file
cmp [esi+INODE.fileSize], eax
jae .read_till_requested
.read_whole_file:
push 1 ; read till the end of file
mov ecx, [esi+INODE.fileSize]
sub ecx, [ebx+4]
jmp @f
.read_till_requested:
push 0 ; read as much as requested
@@: ; ecx = bytes to read, edi -> buffer
push ecx
; read part of the first block
mov edx, [ebx+8]
mov eax, [ebx+4]
div [ebp+EXTFS.bytesPerBlock]
push eax
push ecx
mov ecx, eax
call extfsGetFileBlock
jc .error_at_first_block
mov ebx, [ebp+EXTFS.mainBlockBuffer]
mov eax, ecx
call extfsReadBlock
jc .error_at_first_block
pop ecx
add ebx, edx
neg edx
add edx, [ebp+EXTFS.bytesPerBlock]
cmp ecx, edx
jbe .only_one_block
mov eax, ecx
sub eax, edx ; bytes to read
mov ecx, edx
push esi
mov esi, ebx
rep movsb
pop esi
mov ebx, edi
xor edx, edx
div [ebp+EXTFS.bytesPerBlock]
mov edi, eax
@@:
test edi, edi
jz .finish_block
inc dword [esp]
mov ecx, [esp]
call extfsGetFileBlock
jc .error_at_read_cycle
mov eax, ecx
call extfsReadBlock
jc .error_at_read_cycle
add ebx, [ebp+EXTFS.bytesPerBlock]
dec edi
jmp @b
.finish_block: ; edx = number of bytes in the last block
test edx, edx
jz .end_read
pop ecx ; block counter
inc ecx
call extfsGetFileBlock
jc .error_at_finish_block
mov edi, ebx
mov eax, ecx
mov ebx, [ebp+EXTFS.mainBlockBuffer]
call extfsReadBlock
jc .error_at_finish_block
push eax
mov ecx, edx
.only_one_block:
mov esi, ebx
rep movsb
.end_read:
call ext_unlock
pop eax ebx eax
test eax, eax
jz @f
movi eax, ERROR_END_OF_FILE
@@:
ret
.error_at_first_block:
pop ebx
.error_at_read_cycle:
pop ebx
.error_at_finish_block:
pop ebx ebx
.error_eax:
push eax
.error:
call ext_unlock
xor ebx, ebx
pop eax
ret
;----------------------------------------------------------------
ext_GetFileInfo:
call ext_lock
mov edx, [ebx+16]
cmp byte [esi], 0
jz .is_root
push edx
call findInode
mov ebx, edx
pop edx
lea esi, [ebp+EXTFS.mainInodeBuffer]
jnc @f
push eax
call ext_unlock
pop eax
ret
.is_root:
xor ebx, ebx
lea esi, [ebp+EXTFS.rootInodeBuffer]
@@:
xor eax, eax
mov edi, edx
mov ecx, 40/4
rep stosd
cmp bl, '.'
jne @f
or dword [edx], KOS_HIDDEN
@@:
or dword [edx], KOS_DIRECTORY
test [esi+INODE.accessMode], DIRECTORY
jnz @f
xor dword [edx], KOS_DIRECTORY ; mark as file
mov eax, [esi+INODE.fileSize]
mov ebx, [esi+INODE.fileSizeHigh]
mov dword [edx+32], eax
mov dword [edx+36], ebx
@@:
lea edi, [edx+8]
mov eax, [esi+INODE.inodeModified]
sub eax, 978307200 ; 01.01.1970-01.01.2001 = (365*31+8)*24*60*60
call fsTime2bdfe
mov eax, [esi+INODE.accessedTime]
sub eax, 978307200
call fsTime2bdfe
mov eax, [esi+INODE.dataModified]
sub eax, 978307200
call fsTime2bdfe
call ext_unlock
xor eax, eax
ret
;----------------------------------------------------------------
ext_SetFileInfo:
call extfsWritingInit
pushd [ebx+16]
call findInode
pop edx
jc @f
push esi ; inode number
lea esi, [edx+16]
lea edi, [ebp+EXTFS.mainInodeBuffer]
call fsCalculateTime
add eax, 978307200 ; 01.01.1970-01.01.2001 = (365*31+8)*24*60*60
mov [edi+INODE.accessedTime], eax
add esi, 8
call fsCalculateTime
add eax, 978307200
mov [edi+INODE.dataModified], eax
mov ebx, edi
pop eax
call writeInode
@@:
push eax
jc @f
call writeSuperblock
mov esi, [ebp+PARTITION.Disk]
call disk_sync
@@:
call ext_unlock
pop eax
ret
;----------------------------------------------------------------
ext_Delete:
call extfsWritingInit
push esi
call findInode
mov ebx, esi
pop esi
push eax
jc .ret
pop eax
lea edx, [ebp+EXTFS.mainInodeBuffer]
movzx edx, [edx+INODE.accessMode]
and edx, TYPE_MASK
cmp edx, DIRECTORY
jne .file
push esi ebx edx 0
lea esi, [ebp+EXTFS.mainInodeBuffer]
.checkDirectory:
mov ecx, [esp]
call extfsGetFileBlock
jc .not_empty_eax
test ecx, ecx
jz .empty
mov eax, ecx
mov ebx, [ebp+EXTFS.tempBlockBuffer]
call extfsReadBlock
jc .not_empty_eax
mov edx, ebx
add edx, [ebp+EXTFS.bytesPerBlock]
movzx ecx, [ebx+DIRENTRY.entryLength]
add ebx, ecx
.dir_entry:
cmp byte [ebx+DIRENTRY.nameLength], 1
jne @f
cmp byte [ebx+DIRENTRY.name], '.'
jne .not_empty
@@:
cmp byte [ebx+DIRENTRY.nameLength], 2
jne .not_empty
cmp word [ebx+DIRENTRY.name], '..'
jne .not_empty
movzx ecx, [ebx+DIRENTRY.entryLength]
add ebx, ecx
cmp ebx, edx
jb .dir_entry
inc dword[esp]
jmp .checkDirectory
.empty:
pop edx edx ebx esi
.file:
call findInode_parent
jc .error
mov eax, esi
; save file/folder's and parent's inode
push ebx eax
cmp edx, DIRECTORY
jne @f
; Unlink '.'
mov eax, [esp+4]
call unlinkInode
cmp eax, -1
je .error_stack8
; Unlink '..'
mov eax, [esp+4]
mov ebx, [esp]
call unlinkInode
cmp eax, -1
je .error_stack8
@@:
pop eax
mov ebx, [esp]
call unlinkInode
cmp eax, -1
je .error_stack4
test eax, eax
jz @f
; has hardlinks
xor eax, eax
mov [esp], eax
jmp .disk_sync
@@:
mov eax, [esp]
lea ebx, [ebp+EXTFS.mainInodeBuffer]
call readInode
jc .error_stack4_eax
; free file's data
lea esi, [ebp+EXTFS.mainInodeBuffer]
xor ecx, ecx
@@:
push ecx
call extfsGetFileBlock
jc .error_stack8_eax
mov eax, ecx
test eax, eax
jz @f
xor ecx, ecx
call extfsResourceFree
pop ecx
inc ecx
jmp @b
@@: ; free indirect blocks
pop ecx
push edx
lea edi, [ebp+EXTFS.mainInodeBuffer]
mov eax, [edi+INODE.addressBlock]
test eax, eax
jz .success
xor ecx, ecx
call extfsResourceFree
mov eax, [edi+INODE.doubleAddress]
call freeDoublyIndirectBlock
cmp eax, 1
je .success
mov eax, [edi+INODE.tripleAddress]
test eax, eax
jz .success
push eax
mov ebx, [ebp+EXTFS.tempBlockBuffer]
call extfsReadBlock
pop ecx
jc .error_stack8_eax
mov eax, ecx
xor ecx, ecx
call extfsResourceFree
mov edx, ebx
add edx, [ebp+EXTFS.bytesPerBlock]
@@:
mov eax, [ebx]
test eax, eax
jz .success
push ebx edx
call freeDoublyIndirectBlock
pop edx ebx
cmp eax, 1
je .success
add ebx, 4
cmp ebx, edx
jb @b
.success: ; clear the inode, and add deletion time
xor eax, eax
movzx ecx, [ebp+EXTFS.superblock.inodeSize]
rep stosb
lea edi, [ebp+EXTFS.mainInodeBuffer]
call fsGetTime
pop edx
add eax, 978307200
mov [edi+INODE.deletedTime], eax
mov eax, [esp]
mov ebx, edi
call writeInode
jc .error_stack4_eax
cmp edx, DIRECTORY
jne @f
mov eax, [esp]
dec eax
xor edx, edx
div [ebp+EXTFS.superblock.inodesPerGroup]
push eax
call extfsReadDescriptor
jc .error_stack8
dec [eax+BGDESCR.directoriesCount]
pop eax
call extfsWriteDescriptor
@@: ; free inode
pop eax
dec eax
xor ecx, ecx
inc ecx
call extfsResourceFree
push eax
.disk_sync:
call writeSuperblock
mov esi, [ebp+PARTITION.Disk]
call disk_sync
.ret:
call ext_unlock
xor ebx, ebx
pop eax
ret
.not_empty:
pop eax
.error_stack8:
pop eax
.error_stack4:
pop eax
push ERROR_ACCESS_DENIED
jmp .disk_sync
.not_empty_eax:
pop ebx
.error_stack8_eax:
pop ebx
.error_stack4_eax:
pop ebx
.error:
push eax
jmp .disk_sync
;----------------------------------------------------------------
ext_CreateFolder:
call extfsWritingInit
push esi
call findInode
pop esi
jnc .success ; exist
call findInode_parent
jc .error
mov eax, esi
xor ebx, ebx
inc ebx
call extfsResourceAlloc
jc .error
inc ebx
push ebx esi edi
xor al, al
lea edi, [ebp+EXTFS.tempInodeBuffer]
movzx ecx, [ebp+EXTFS.superblock.inodeSize]
rep stosb
lea edi, [ebp+EXTFS.tempInodeBuffer]
call fsGetTime
add eax, 978307200
mov [edi+INODE.accessedTime], eax
mov [edi+INODE.dataModified], eax
mov ebx, edi
pop edi esi edx
; edx = allocated inode number, edi -> filename, esi = parent inode number
mov [ebx+INODE.accessMode], DIRECTORY or PERMISSIONS
mov eax, edx
call writeInode
jc .error
; link to self
push edx esi
mov eax, edx
mov ebx, eax
mov dl, DIR_DIRECTORY
mov esi, self_link
call linkInode
pop esi edx
jc .error
; link to parent
push edx esi
mov eax, ebx
mov ebx, esi
mov dl, DIR_DIRECTORY
mov esi, parent_link
call linkInode
pop esi edx
jc .error
; link parent to child
mov eax, esi
mov ebx, edx
mov esi, edi
mov dl, DIR_DIRECTORY
call linkInode
jc .error
mov eax, ebx
dec eax
xor edx, edx
div [ebp+EXTFS.superblock.inodesPerGroup]
mov edx, eax
call extfsReadDescriptor
jc @f
inc [eax+BGDESCR.directoriesCount]
mov eax, edx
call extfsWriteDescriptor
.success:
.error:
push eax
call writeSuperblock
mov esi, [ebp+PARTITION.Disk]
call disk_sync
call ext_unlock
pop eax
ret
@@:
movi eax, ERROR_DEVICE
jmp .error
self_link db ".", 0
parent_link db "..", 0
;----------------------------------------------------------------
ext_CreateFile:
call extfsWritingInit
push ebx esi
call findInode
mov esi, [esp]
jc @f
call ext_unlock
call ext_Delete
push eax
call ext_lock
pop eax
test eax, eax
jnz .error
mov esi, [esp]
@@:
call findInode_parent
jc .error
mov eax, esi
xor ebx, ebx
inc ebx
call extfsResourceAlloc
jc .error
inc ebx
push ebx esi edi
xor al, al
lea edi, [ebp+EXTFS.tempInodeBuffer]
movzx ecx, [ebp+EXTFS.superblock.inodeSize]
rep stosb
lea edi, [ebp+EXTFS.tempInodeBuffer]
call fsGetTime
add eax, 978307200
mov [edi+INODE.accessedTime], eax
mov [edi+INODE.dataModified], eax
mov ebx, edi
pop edi esi edx
; edx = allocated inode number, edi -> filename, esi = parent inode number
mov [ebx+INODE.accessMode], FLAG_FILE or PERMISSIONS
mov eax, edx
call writeInode
jc .error
; link parent to child
mov eax, esi
mov ebx, edx
mov esi, edi
mov dl, DIR_FLAG_FILE
call linkInode
jc .error
pop esi ebx
call ext_unlock
jmp ext_WriteFile
.error:
push eax
call ext_unlock
pop eax ebx ebx
xor ebx, ebx
ret
;----------------------------------------------------------------
ext_WriteFile:
call extfsWritingInit
push 0 ebx
call findInode
jc .error
lea edx, [ebp+EXTFS.mainInodeBuffer]
movi eax, ERROR_ACCESS_DENIED
test [edx+INODE.accessMode], FLAG_FILE
jz .error ; not a file
mov ebx, [esp]
push esi ; inode number
mov eax, esi
mov ecx, [ebx+4]
call extfsExtendFile
jc .error2
mov ecx, [ebx+12]
mov esi, [ebx+16]
mov eax, [edx+INODE.fileSize]
push eax
xor edx, edx
div [ebp+EXTFS.bytesPerBlock]
test edx, edx
jz .start_aligned
mov ebx, [ebp+EXTFS.bytesPerBlock]
sub ebx, edx
cmp ebx, ecx
jbe @f
mov ebx, ecx
@@:
push eax
call extfsReadFileBlock
pop edi
jc .error_inode_size
mov eax, edi
push ecx
mov ecx, ebx
mov edi, ebx
add edi, edx
rep movsb
pop ecx
call extfsWriteFileBlock
jc .error_inode_size
add [esp], ebx
sub ecx, ebx
jz .write_inode
.start_aligned:
cmp ecx, [ebp+EXTFS.bytesPerBlock]
jb @f
mov eax, [esp]
xor edx, edx
div [ebp+EXTFS.bytesPerBlock]
mov edx, [esp+4]
push eax
call extfsEraseFileBlock
pop edi
jc .error_inode_size
mov eax, edi
push ecx
mov ecx, [ebp+EXTFS.bytesPerBlock]
mov edi, [ebp+EXTFS.mainBlockBuffer]
rep movsb
pop ecx
call extfsWriteFileBlock
jc .error_inode_size
mov eax, [ebp+EXTFS.bytesPerBlock]
sub ecx, eax
add [esp], eax
jmp .start_aligned
@@: ; Handle the remaining bytes.
test ecx, ecx
jz .write_inode
mov eax, [esp]
xor edx, edx
div [ebp+EXTFS.bytesPerBlock]
push eax
call extfsReadFileBlock
pop eax
jnc @f
mov edx, [esp+4]
push eax
call extfsEraseFileBlock
pop edi
jc .error_inode_size
mov eax, edi
@@:
push ecx
mov edi, [ebp+EXTFS.mainBlockBuffer]
rep movsb
pop ecx
call extfsWriteFileBlock
jc .error_inode_size
add [esp], ecx
xor ecx, ecx
.error_inode_size:
mov [esp+12], eax
.write_inode:
lea ebx, [ebp+EXTFS.tempInodeBuffer]
pop [ebx+INODE.fileSize]
pop eax
call writeInode
pop ebx
mov ebx, [ebx+12]
sub ebx, ecx
test eax, eax
jz @f
mov [esp], eax
@@:
call writeSuperblock
mov esi, [ebp+PARTITION.Disk]
call disk_sync
@@:
call ext_unlock
pop eax
ret
.error2:
pop ebx
.error:
pop ebx ebx
push eax
jmp @b
;----------------------------------------------------------------
ext_SetFileEnd:
call extfsWritingInit
pushd [ebx+4]
call findInode
pop ecx
jc @f
lea edx, [ebp+EXTFS.mainInodeBuffer]
movi eax, ERROR_ACCESS_DENIED
cmp [edx+INODE.accessMode], FLAG_FILE
jnz @f ; not a file
mov eax, esi
call extfsExtendFile
jc @f
mov eax, esi
call extfsTruncateFile
jc @f
mov eax, esi
lea ebx, [ebp+EXTFS.tempInodeBuffer]
call writeInode
@@:
push eax
call writeSuperblock
mov esi, [ebp+PARTITION.Disk]
call disk_sync
call ext_unlock
pop eax
ret