WebSVN – Kolibri OS – Diff – /kernel/trunk/fs/ext.inc


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;;                                                              ;;
;; Copyright (C) KolibriOS team 2013-2016. All rights reserved. ;;
;;  Distributed under terms of the GNU General Public License.  ;;
;;                                                              ;;
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$Revision: 6575 $
 
; EXT external functions
;   in:
; ebx -> parameter structure of sysfunc 70
; ebp -> EXTFS structure
; esi -> path string in UTF-8
;   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  ?
align0  rb  200h-EXTFS.align0
superblock          SUPERBLOCK
align1  rb  400h-EXTFS.align1
rootInodeBuffer     INODE
align2  rb  600h-EXTFS.align2
inodeBuffer         INODE
align3  rb  800h-EXTFS.align3
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
        ja      .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
        movi    eax, sizeof.EXTFS
        call    malloc
        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:
        mov     eax, ebp
        call    free
        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]
        pop     eax
        jmp     free
 
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    edx eax
        call    extfsReadDescriptor
        jc      .fail2
        inc     [eax+BGDESCR.blocksFree+ecx*2]
        mov     edx, [eax+BGDESCR.blockBitmap+ecx*4]
        pop     eax
        call    extfsWriteDescriptor
        jc      .fail
        mov     eax, edx
        mov     ebx, [ebp+EXTFS.tempBlockBuffer]
        call    extfsReadBlock
        jc      .fail
        pop     eax
        push    edx
        mov     edx, eax
        and     edx, 31
        shr     eax, 5
        shl     eax, 2
        add     eax, [ebp+EXTFS.tempBlockBuffer]
        btr     [eax], edx
        pop     eax
        mov     ebx, [ebp+EXTFS.tempBlockBuffer]
        call    extfsWriteBlock
        jc      @f
        inc     [ebp+EXTFS.superblock.blocksFree+ecx*4]
 
 
@@:
        pop     edx ebx
        ret
 
.fail2:
        pop     eax
.fail:
        pop     eax
        movi    eax, ERROR_DEVICE
        jmp     @b
 
freeDoublyIndirectBlock:
; in: eax = doubly-indirect block number
; out: eax=1 -> finished
        test    eax, eax
        jz      .complete
        push    eax
        mov     ebx, [ebp+EXTFS.mainBlockBuffer]
        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:    ; also erases
; in: esi -> inode, 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 eax
        push    eax
        call    extfsWriteBlock
        pop     ebx
        jc      @f
        mov     eax, [ebp+EXTFS.sectorsPerBlock]
        add     [esi+INODE.sectorsUsed], eax
        xor     eax, eax
@@:
        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]
        js      .next
        mov     edx, [eax+BGDESCR.blockBitmap+ebx*4]
        mov     eax, [esp]
        call    extfsWriteDescriptor
        jc      .fail
        push    ebx
        mov     eax, edx
        mov     ebx, [ebp+EXTFS.tempBlockBuffer]
        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.tempBlockBuffer]
        shl     edi, 3
        add     eax, edi
        mov     ecx, eax
        mov     eax, edx
        push    ebx
        mov     ebx, [ebp+EXTFS.tempBlockBuffer]
        call    extfsWriteBlock
        pop     ebx
        jc      .fail
        pop     eax
        mul     [ebp+EXTFS.superblock.blocksPerGroup+ebx*8]
        add     eax, ecx
        dec     [ebp+EXTFS.superblock.blocksFree+ebx*4]
        mov     ebx, eax
        pop     eax
        xor     eax, eax
 
@@:
        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: esi -> inode, ecx = file block number
 
 
; 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:
        mov     eax, [esi+INODE.addressBlock]
        test    eax, eax
        jz      .noBlock
        mov     ebx, [ebp+EXTFS.tempBlockBuffer]
        call    extfsReadBlock
        jc      .fail2
        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
        push    edx ebx
        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]
        mov     eax, [esi+INODE.tripleAddress]
        test    eax, eax
        jz      .noBlock
        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      .noBlock
        call    extfsReadBlock
        jc      .fail2
        mov     eax, edx
        jmp     @f
 
.noBlock:
        xor     ecx, ecx
.fail2:
        pop     ebx edx
        ret
 
.get_double_indirect_block:
        mov     eax, [esi+INODE.doubleAddress]
        test    eax, eax
        jz      .noBlock
        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      .noBlock
        call    extfsReadBlock
        jc      .fail2
        mov     ecx, [ebx+edx*4]
        pop     ebx edx
        ret
 
extfsSetFileBlock:
;   in:
; ecx = file block number
; edi = block number
; edx = inode 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
        mov     eax, edx
        call    inodeBlockAlloc
        jc      .ret
        mov     [esi+INODE.tripleAddress], ebx
        mov     eax, ebx
@@:
        push    eax
        mov     ebx, [ebp+EXTFS.mainBlockBuffer]
        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
        mov     eax, [esp+4]
        call    inodeBlockAlloc
        jc      .fail_alloc_4
        mov     [ecx], ebx
        mov     eax, [esp]
        mov     ebx, [ebp+EXTFS.mainBlockBuffer]
        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
        mov     eax, edx
        call    inodeBlockAlloc
        jc      .ret
        mov     [esi+INODE.doubleAddress], ebx
        mov     eax, ebx
.double_indirect_present:
        push    eax
        mov     ebx, [ebp+EXTFS.mainBlockBuffer]
        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
        mov     eax, [esp+8]
        call    inodeBlockAlloc
        jc      .fail_alloc_8
        mov     [ecx], ebx
        mov     eax, [esp+4]
        mov     ebx, [ebp+EXTFS.mainBlockBuffer]
        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
        mov     eax, edx
        call    inodeBlockAlloc
        jc      .ret
        mov     [esi+INODE.addressBlock], ebx
        mov     eax, ebx
@@:
        push    eax
        mov     ebx, [ebp+EXTFS.mainBlockBuffer]
        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
 
extfsFileBlockAlloc:
;   in:
; esi -> inode
; edx = inode number
; eax = file block number
;   out:
; edi = allocated block number
        push    ebx ecx
 
 
 
 
 
 
 
 
 
 
        mov     ecx, eax
 
 
 
 
 
        mov     eax, edx
        xor     ebx, ebx
        call    extfsResourceAlloc
 
        jc      @f
 
        mov     edi, ebx
        call    extfsSetFileBlock
        jc      @f
        mov     eax, [ebp+EXTFS.sectorsPerBlock]
        add     [esi+INODE.sectorsUsed], eax
        xor     eax, eax
@@:
 
 
 
 
 
 
 
 
 
        pop     ecx ebx
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
        ret
 
extfsReadFileBlock:
;   in:
; eax = file block number
; [ebp+EXTFS.inodeBuffer] = inode
;   out:
; [ebp+EXTFS.mainBlockBuffer] -> block
        push    ebx ecx edx esi
        mov     ecx, eax
        lea     esi, [ebp+EXTFS.inodeBuffer]
        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
; ebx -> data
; [ebp+EXTFS.inodeBuffer] = inode
 
        push    ecx edx esi
        mov     ecx, eax
        lea     esi, [ebp+EXTFS.inodeBuffer]
        call    extfsGetFileBlock
        jc      @f
        test    ecx, ecx
        jz      @b
        mov     eax, ecx
 
        call    extfsWriteBlock
@@:
        pop     esi edx ecx
        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:
; [ebp+EXTFS.inodeBuffer] = inode
; eax = inode number
; ecx = new size
        push    ebx ecx edx esi edi eax
        lea     esi, [ebp+EXTFS.inodeBuffer]
 
 
        mov     eax, [esi+INODE.fileSize]
 
        sub     ecx, eax
        jna     .ret
        mov     ebx, eax
        xor     edx, edx
        div     [ebp+EXTFS.bytesPerBlock]
        test    edx, edx
        jz      .start_aligned
        mov     eax, [ebp+EXTFS.bytesPerBlock]
        sub     eax, edx
        cmp     eax, ecx
        jbe     @f
        mov     eax, ecx
 
 
 
@@:
 
 
 
 
 
        add     ebx, eax
 
 
 
 
 
        sub     ecx, eax
        jz      .done
.start_aligned:
 
 
        mov     eax, ebx
        xor     edx, edx
        div     [ebp+EXTFS.bytesPerBlock]
        mov     edx, [esp]
        call    extfsFileBlockAlloc
        jc      .error
        mov     eax, [ebp+EXTFS.bytesPerBlock]
        add     ebx, eax
        sub     ecx, eax
 
        ja      .start_aligned
 
 
 
 
 
 
 
 
 
 
        add     ebx, ecx
.done:
        xor     eax, eax
.error:
 
        mov     [esi+INODE.fileSize], ebx
.ret:
        pop     edi edi esi edx ecx ebx
        ret
 
extfsTruncateFile:
;   in:
; [ebp+EXTFS.inodeBuffer] = inode
; ecx = new size
        push    ebx ecx edx esi edi
        lea     esi, [ebp+EXTFS.inodeBuffer]
 
 
        mov     eax, [esi+INODE.fileSize]
 
        sub     ecx, eax
        jnc     .ret
        neg     ecx
        mov     ebx, eax
        xor     edx, edx
        div     [ebp+EXTFS.bytesPerBlock]
        test    edx, edx
 
 
 
        jnz     @f
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
.start_aligned:
        mov     edx, [ebp+EXTFS.bytesPerBlock]
 
 
 
 
        dec     eax
@@:
        cmp     ecx, edx
        jc      .tail
        push    ecx edx
        mov     edi, eax
        mov     ecx, eax
 
        call    extfsGetFileBlock
        jc      .error
        test    ecx, ecx
        jz      @f
        mov     eax, ecx
        xor     ecx, ecx
        call    extfsResourceFree
        mov     ecx, edi
        xor     edi, edi
        movi    edx, ROOT_INODE
        call    extfsSetFileBlock
        mov     eax, [ebp+EXTFS.sectorsPerBlock]
        sub     [esi+INODE.sectorsUsed], eax
@@:
        pop     edx ecx
        sub     ebx, edx
        sub     ecx, edx
        jz      .done
        mov     eax, ebx
        xor     edx, edx
        div     [ebp+EXTFS.bytesPerBlock]
 
 
        jmp     .start_aligned
 
 
.tail:      ; handle the remaining bytes
 
 
 
        sub     ebx, ecx
 
 
 
 
 
 
 
.done:
        xor     eax, eax
@@:
 
        mov     [esi+INODE.fileSize], ebx
.ret:
        pop     edi esi edx ecx ebx
        ret
 
.error:
        pop     edx ecx
        jmp     @b
 
 
linkInode:
;   in:
; eax = inode on which to link
; ebx = inode to link
; esi -> name in UTF-8
;  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.inodeBuffer]
        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
.searchBlock:
        push    eax     ; blocks total
        push    ecx     ; current file block number
        cmp     eax, ecx
        jz      .alloc_block
        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+12]
        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
        pop     ecx ecx eax
        inc     ecx
        jmp     .searchBlock
 
.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
 
.alloc_block:
        mov     eax, [esp]
 
 
 
        mov     edx, [esp+24]
 
        call    extfsFileBlockAlloc
        jc      .error_get_inode_block
        mov     eax, [ebp+EXTFS.bytesPerBlock]
        add     [esi+INODE.fileSize], 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     edi, [ebp+EXTFS.tempBlockBuffer]
 
 
 
        mov     eax, [ebp+EXTFS.bytesPerBlock]
        mov     [edi+DIRENTRY.entryLength], ax
.found:
        pop     edx ecx ecx ecx ebx esi
        push    ebx
        mov     [edi+DIRENTRY.inodeNumber], ebx
        sub     ecx, 8
        mov     word [edi+DIRENTRY.nameLength], cx
        cmp     [ebp+EXTFS.superblock.dynamicVersionFlag], 0
        je      .name
        mov     eax, [esp+4]
        mov     [edi+DIRENTRY.fileType], al
.name:
 
 
        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.inodeBuffer]
        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 ebx
        lea     ebx, [ebp+EXTFS.inodeBuffer]
        call    readInode
        jc      .fail
        push    eax
        lea     esi, [ebp+EXTFS.inodeBuffer]
.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.inodeBuffer]
        call    readInode
        jc      .fail
        dec     word [ebx+INODE.linksCount]
        mov     eax, [esp]
        call    writeInode
        jc      .fail
        movzx   eax, word [ebx+INODE.linksCount]
@@:
        pop     ebx edx
        ret
 
findInode:
; in: esi -> path string in UTF-8
;   out:
; edi -> file name in UTF-8
; esi = last inode number
; [ebp+EXTFS.inodeBuffer] = last inode
; ecx = parent inode number
; CF=1 -> file not found, edi=0 -> error
        push    esi
        lea     esi, [ebp+EXTFS.rootInodeBuffer]
        lea     edi, [ebp+EXTFS.inodeBuffer]
        movzx   ecx, [ebp+EXTFS.superblock.inodeSize]
        mov     edx, esi
        rep movsb
        pop     esi
        pushd   0 ROOT_INODE
        mov     edi, esi
        cmp     [edx+INODE.sectorsUsed], 0
        jz      .not_found
        cmp     byte [esi], 0
        jnz     .next_path_part
        xor     eax, eax
        pop     esi ecx
        ret
 
@@:
        pop     esi esi
.error:
        pop     esi ecx
        xor     edi, edi
        stc
        ret
 
.next_path_part:
        push    [edx+INODE.sectorsUsed]
        xor     ecx, ecx
.folder_block_cycle:
        push    ecx
        xchg    esi, edx
        call    extfsGetFileBlock
        jc      @b
        xchg    esi, edx
        mov     eax, ecx
        mov     ebx, [ebp+EXTFS.mainBlockBuffer]
        call    extfsReadBlock
        jc      @b
        push    esi edx
        mov     edx, ebx
        add     edx, [ebp+EXTFS.bytesPerBlock]
.start_rec:
        cmp     [ebx+DIRENTRY.inodeNumber], 0
        jz      .next_rec
        push    esi
        movzx   ecx, [ebx+DIRENTRY.nameLength]
        lea     edi, [ebx+DIRENTRY.name]
        repz cmpsb
        jz      .test_find
@@: ; 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
@@:
        pop     edx edx edi ecx eax
; ebx -> matched directory entry, esi -> name without parent, or not changed
        cmp     edi, esi
        jnz     @f
        sub     eax, [ebp+EXTFS.sectorsPerBlock]
        jle     .not_found
        push    eax
        inc     ecx
        jmp     .folder_block_cycle
 
@@:
        pop     eax
        mov     [esp], eax
        mov     eax, [ebx+DIRENTRY.inodeNumber]
        lea     ebx, [ebp+EXTFS.inodeBuffer]
        push    eax
        call    readInode
        jc      .error
        cmp     byte [esi], 0
        je      .ret
        mov     edx, ebx
        movzx   eax, [ebx+INODE.accessMode]
        and     eax, TYPE_MASK
        cmp     eax, DIRECTORY
        jz      .next_path_part
        xor     edi, edi    ; path folder is a file
        jmp     @f
 
.not_found:
        mov     esi, edi
        call    strlen
        mov     al, '/'
        repnz scasb
        mov     edi, esi
        jnz     @f
        xor     edi, edi    ; path folder not found
@@:
        movi    eax, ERROR_FILE_NOT_FOUND
        stc
.ret:
        pop     esi ecx
        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.inodeBuffer]
        test    [esi+INODE.accessMode], FLAG_FILE
        jnz     .error_not_found
        jmp     @f
 
.root_folder:
        lea     esi, [ebp+EXTFS.rootInodeBuffer]
        lea     edi, [ebp+EXTFS.inodeBuffer]
        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 edi
        pushd   [edi+12]
        mov     edi, edx
        xor     eax, eax
        mov     ecx, 40 / 4
        rep stosd
        popd    [edx+4] edi
        mov     eax, [ebx+DIRENTRY.inodeNumber]
        mov     ebx, [ebp+EXTFS.tempBlockBuffer]
        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], FLAG_FILE
        jz      @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     esi, [esi+DIRENTRY.name]
        add     ecx, esi
        cmp     byte [esi], '.'
        jnz     @f
        or      byte [edx], KOS_HIDDEN
@@:
        lea     edi, [edx+40]
        cmp     byte [edx+4], 1
        jz      .utf16
@@:
        call    utf8to16
        call    uni2ansi_char
        stosb
        cmp     esi, ecx
        jc      @b
        and     byte [edi], 0
        add     edx, 40+264
@@:
        pop     esi ecx edi ebx
        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
 
.utf16:
        call    utf8to16
        stosw
        cmp     esi, ecx
        jc      .utf16
        and     word [edi], 0
        add     edx, 40+520
        jmp     @b
 
.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.inodeBuffer]
        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
        pop     edx
        lea     esi, [ebp+EXTFS.inodeBuffer]
        jnc     @f
        push    eax
        call    ext_unlock
        pop     eax
        ret
 
.is_root:
        mov     edi, esi
        lea     esi, [ebp+EXTFS.rootInodeBuffer]
@@:
        mov     bl, [edi]
        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], FLAG_FILE
        jz      @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.inodeBuffer]
        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
        call    findInode
        mov     ebx, esi
        push    eax
        jc      .ret
        pop     eax
        lea     edx, [ebp+EXTFS.inodeBuffer]
        movzx   edx, [edx+INODE.accessMode]
        and     edx, TYPE_MASK
        cmp     edx, DIRECTORY
        jne     .file
        push    ebx ecx edx 0
        lea     esi, [ebp+EXTFS.inodeBuffer]
.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 ecx ebx
.file:
        mov     eax, ecx
        push    ebx ecx
        call    unlinkInode
        cmp     eax, -1
        je      .error_stack8
        pop     ebx
        test    eax, eax
        jz      @f
        xor     eax, eax
        cmp     edx, DIRECTORY
        jnz     .error_stack4_eax   ; hardlinks
        mov     eax, [esp]
        call    unlinkInode
@@:
        mov     eax, [esp]
        lea     ebx, [ebp+EXTFS.inodeBuffer]
        call    readInode
        jc      .error_stack4_eax
; free file's data
        lea     esi, [ebp+EXTFS.inodeBuffer]
        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.inodeBuffer]
        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
        xor     edx, edx
        mov     ecx, eax
@@:
        mov     eax, ecx
        mov     ebx, [ebp+EXTFS.mainBlockBuffer]
        call    extfsReadBlock
 
        jc      .error_stack8_eax
 
 
 
 
 
 
        mov     eax, [ebx+edx]
        test    eax, eax
        jz      @f
        push    ecx edx
        call    freeDoublyIndirectBlock
        pop     edx ecx
        cmp     eax, 1
        je      @f
        add     edx, 4
        cmp     edx, [ebp+EXTFS.bytesPerBlock]
        jb      @b
@@:
        mov     eax, ecx
        xor     ecx, ecx
        call    extfsResourceFree
.success:   ; clear the inode, and add deletion time
        xor     eax, eax
        movzx   ecx, [ebp+EXTFS.superblock.inodeSize]
        rep stosb
        lea     edi, [ebp+EXTFS.inodeBuffer]
        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 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
        call    findInode
        jnc     .success    ; exist
        test    edi, edi
        jz      .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.inodeBuffer]
        movzx   ecx, [ebp+EXTFS.superblock.inodeSize]
        rep stosb
        lea     edi, [ebp+EXTFS.inodeBuffer]
        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    0 ebx
        call    findInode
        jnc     .exist
        test    edi, edi
        jz      .error
        mov     eax, esi
        xor     ebx, ebx
        inc     ebx
        call    extfsResourceAlloc
        jc      .error
        inc     ebx
        push    ebx ebx esi edi
        xor     al, al
        lea     edi, [ebp+EXTFS.inodeBuffer]
        movzx   ecx, [ebp+EXTFS.superblock.inodeSize]
        rep stosb
        lea     edi, [ebp+EXTFS.inodeBuffer]
        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      .error2
; link parent to child
        mov     eax, esi
        mov     ebx, edx
        mov     esi, edi
        mov     dl, DIR_FLAG_FILE
        call    linkInode
        jc      .error2
        pop     esi ebx
        push    ebx esi
        mov     ecx, [ebx+12]
        jmp     ext_WriteFile.start
 
.exist:
        lea     edx, [ebp+EXTFS.inodeBuffer]
        movi    eax, ERROR_ACCESS_DENIED
        test    [edx+INODE.accessMode], FLAG_FILE
        jz      .error  ; not a file
        pop     ebx
        push    ebx esi
        mov     ecx, [ebx+12]
        call    extfsTruncateFile
        jnc     ext_WriteFile.start
.error2:
        pop     ebx
.error:
        push    eax
        call    ext_unlock
        pop     eax ebx ebx
        xor     ebx, ebx
        ret
 
;----------------------------------------------------------------
ext_WriteFile:
        call    extfsWritingInit
        push    0 ebx
        call    findInode
        pop     ebx
        push    ebx esi
        jc      .error
        lea     edx, [ebp+EXTFS.inodeBuffer]
        movi    eax, ERROR_ACCESS_DENIED
        test    [edx+INODE.accessMode], FLAG_FILE
        jz      .error  ; not a file
        mov     ecx, [ebx+4]
        add     ecx, [ebx+12]
.start:
        mov     eax, esi
        call    extfsExtendFile
        jc      .error
        mov     eax, [ebx+4]
        mov     ecx, [ebx+12]
        mov     ebx, [ebx+16]
        push    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
@@:
        mov     edi, eax
        call    extfsReadFileBlock
 
        jc      .error_inode_size
        mov     eax, edi
        push    ebx ecx
        mov     ecx, esi
        mov     edi, [ebp+EXTFS.mainBlockBuffer]
        mov     esi, ebx
        mov     ebx, edi
        add     edi, edx
        mov     edx, ecx
        rep movsb
 
        call    extfsWriteFileBlock
        pop     ecx ebx
        jc      .error_inode_size
        add     [esp], edx
        add     ebx, edx
        sub     ecx, edx
        jz      .write_inode
.start_aligned:
        cmp     ecx, [ebp+EXTFS.bytesPerBlock]
        jb      @f
        mov     eax, [esp]
        xor     edx, edx
        div     [ebp+EXTFS.bytesPerBlock]
 
 
 
 
 
 
 
 
 
 
 
        call    extfsWriteFileBlock
        jc      .error_inode_size
        mov     eax, [ebp+EXTFS.bytesPerBlock]
        sub     ecx, eax
        add     ebx, 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    ecx
        mov     esi, ebx
        mov     edi, [ebp+EXTFS.mainBlockBuffer]
        mov     ebx, edi
        rep movsb
        pop     ecx
        call    extfsWriteFileBlock
        jc      .error_inode_size
 
        xor     ecx, ecx
.error_inode_size:
        mov     [esp+12], eax
.write_inode:
        lea     ebx, [ebp+EXTFS.inodeBuffer]
        pop     eax 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
 
.error:
        pop     ebx ebx ebx
        push    eax
        jmp     @b
 
;----------------------------------------------------------------
ext_SetFileEnd:
        call    extfsWritingInit
        pushd   [ebx+4]
        call    findInode
 
        jc      .error
        lea     edi, [ebp+EXTFS.inodeBuffer]
        movi    eax, ERROR_ACCESS_DENIED
        cmp     [edi+INODE.accessMode], FLAG_FILE
        jnz     .error  ; not a file
        pop     ecx
        push    esi
        mov     ebx, [edi+INODE.fileSize]
        mov     eax, esi
        cmp     ebx, ecx
        jc      @f
        call    extfsTruncateFile
        jc      .error
        jmp     .done
 
@@:
        call    extfsExtendFile
        jc      .error
        sub     ecx, ebx
        mov     eax, ebx
        xor     edx, edx
        div     [ebp+EXTFS.bytesPerBlock]
        mov     edi, eax
        test    edx, edx
        jz      .start_aligned
        call    extfsReadFileBlock
        jc      .error
        mov     eax, [ebp+EXTFS.bytesPerBlock]
        sub     eax, edx
        cmp     eax, ecx
        jbe     @f
        mov     eax, ecx
@@:
        mov     ebx, [ebp+EXTFS.mainBlockBuffer]
        push    edi ecx
        mov     ecx, eax
        mov     edi, ebx
        add     edi, edx
        xor     eax, eax
        mov     edx, ecx
        rep stosb
        pop     ecx edi
        mov     eax, edi
        call    extfsWriteFileBlock
        jc      .error
        sub     ecx, edx
        jz      .done
        inc     edi
.start_aligned:
        mov     eax, ecx
        mov     ecx, [ebp+EXTFS.bytesPerBlock]
        dec     eax
        xor     edx, edx
        div     ecx
        inc     eax
        mov     ebx, [ebp+EXTFS.mainBlockBuffer]
        push    eax edi
        mov     edi, ebx
        xor     eax, eax
        rep stosb
        pop     edi ecx
@@:
        mov     eax, edi
        call    extfsWriteFileBlock
        jc      .error
        inc     edi
        loop    @b
.done:
        mov     eax, [esp]
        lea     ebx, [ebp+EXTFS.inodeBuffer]
        call    writeInode
 
        jc      .error
        call    writeSuperblock
        mov     esi, [ebp+PARTITION.Disk]
        call    disk_sync
        xor     eax, eax
.error:
        mov     [esp], eax
        call    ext_unlock
        pop     eax
        ret

Rev 6558	Rev 6575
1	;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;	1	;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
2	;; ;;	2	;; ;;
3	;; Copyright (C) KolibriOS team 2013-2016. All rights reserved. ;;	3	;; Copyright (C) KolibriOS team 2013-2016. All rights reserved. ;;
4	;; Distributed under terms of the GNU General Public License. ;;	4	;; Distributed under terms of the GNU General Public License. ;;
5	;; ;;	5	;; ;;
6	;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;	6	;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
7		7
8	$Revision: 6558 $	8	$Revision: 6575 $
9		9
10	; EXT external functions	10	; EXT external functions
11	; in:	11	; in:
12	; ebx -> parameter structure of sysfunc 70	12	; ebx -> parameter structure of sysfunc 70
13	; ebp -> EXTFS structure	13	; ebp -> EXTFS structure
14	; esi -> path string in UTF-8	14	; esi -> path string in UTF-8
15	; out:	15	; out:
16	; eax, ebx = return values for sysfunc 70	16	; eax, ebx = return values for sysfunc 70
17	iglobal	17	iglobal
18	align 4	18	align 4
19	ext_user_functions:	19	ext_user_functions:
20	dd ext_free	20	dd ext_free
21	dd (ext_user_functions_end - ext_user_functions - 4) / 4	21	dd (ext_user_functions_end - ext_user_functions - 4) / 4
22	dd ext_ReadFile	22	dd ext_ReadFile
23	dd ext_ReadFolder	23	dd ext_ReadFolder
24	dd ext_CreateFile	24	dd ext_CreateFile
25	dd ext_WriteFile	25	dd ext_WriteFile
26	dd ext_SetFileEnd	26	dd ext_SetFileEnd
27	dd ext_GetFileInfo	27	dd ext_GetFileInfo
28	dd ext_SetFileInfo	28	dd ext_SetFileInfo
29	dd 0	29	dd 0
30	dd ext_Delete	30	dd ext_Delete
31	dd ext_CreateFolder	31	dd ext_CreateFolder
32	ext_user_functions_end:	32	ext_user_functions_end:
33	endg	33	endg
34		34
35	struct DIRENTRY	35	struct DIRENTRY
36	inodeNumber dd ?	36	inodeNumber dd ?
37	entryLength dw ?	37	entryLength dw ?
38	nameLength db ?	38	nameLength db ?
39	fileType db ?	39	fileType db ?
40	name db ? ; rb [nameLength]	40	name db ? ; rb [nameLength]
41	ends	41	ends
42		42
43	struct INODE	43	struct INODE
44	accessMode dw ?	44	accessMode dw ?
45	UID dw ?	45	UID dw ?
46	fileSize dd ?	46	fileSize dd ?
47	accessedTime dd ?	47	accessedTime dd ?
48	inodeModified dd ?	48	inodeModified dd ?
49	dataModified dd ?	49	dataModified dd ?
50	deletedTime dd ?	50	deletedTime dd ?
51	GID dw ?	51	GID dw ?
52	linksCount dw ?	52	linksCount dw ?
53	sectorsUsed dd ?	53	sectorsUsed dd ?
54	featureFlags dd ?	54	featureFlags dd ?
55	reserved dd ?	55	reserved dd ?
56	blockNumbers rd 12	56	blockNumbers rd 12
57	addressBlock dd ?	57	addressBlock dd ?
58	doubleAddress dd ?	58	doubleAddress dd ?
59	tripleAddress dd ?	59	tripleAddress dd ?
60	generation dd ?	60	generation dd ?
61	ACL dd ?	61	ACL dd ?
62	fileSizeHigh dd ?	62	fileSizeHigh dd ?
63	ends	63	ends
64		64
65	struct BGDESCR ; block group descriptor	65	struct BGDESCR ; block group descriptor
66	blockBitmap dd ?	66	blockBitmap dd ?
67	inodeBitmap dd ?	67	inodeBitmap dd ?
68	inodeTable dd ?	68	inodeTable dd ?
69	blocksFree dw ?	69	blocksFree dw ?
70	inodesFree dw ?	70	inodesFree dw ?
71	directoriesCount dw ?	71	directoriesCount dw ?
72	reserved rb 14	72	reserved rb 14
73	ends	73	ends
74		74
75	struct SUPERBLOCK	75	struct SUPERBLOCK
76	inodesTotal dd ?	76	inodesTotal dd ?
77	blocksTotal dd ?	77	blocksTotal dd ?
78	blocksReserved dd ?	78	blocksReserved dd ?
79	blocksFree dd ?	79	blocksFree dd ?
80	inodesFree dd ?	80	inodesFree dd ?
81	firstGroupBlock dd ?	81	firstGroupBlock dd ?
82	sectorsPerBlockLog dd ? ; shift for 1024	82	sectorsPerBlockLog dd ? ; shift for 1024
83	fragmentSizeLog dd ?	83	fragmentSizeLog dd ?
84	blocksPerGroup dd ?	84	blocksPerGroup dd ?
85	fragmentsPerGroup dd ?	85	fragmentsPerGroup dd ?
86	inodesPerGroup dd ?	86	inodesPerGroup dd ?
87	lastMountTime dd ?	87	lastMountTime dd ?
88	lastWriteTime dd ?	88	lastWriteTime dd ?
89	mountCount dw ?	89	mountCount dw ?
90	mountMax dw ?	90	mountMax dw ?
91	magic dw ?	91	magic dw ?
92	state dw ?	92	state dw ?
93	errorHandling dw ?	93	errorHandling dw ?
94	additionalVersion dw ?	94	additionalVersion dw ?
95	lastCheck dd ?	95	lastCheck dd ?
96	checkInterval dd ?	96	checkInterval dd ?
97	creatorOS dd ?	97	creatorOS dd ?
98	dynamicVersionFlag dd ?	98	dynamicVersionFlag dd ?
99	reservedUID dw ?	99	reservedUID dw ?
100	reservedGID dw ?	100	reservedGID dw ?
101	firstInode dd ?	101	firstInode dd ?
102	inodeSize dw ?	102	inodeSize dw ?
103	thisBlockGroup dw ?	103	thisBlockGroup dw ?
104	compatibleFlags dd ?	104	compatibleFlags dd ?
105	incompatibleFlags dd ?	105	incompatibleFlags dd ?
106	RO_compatibleFlags dd ?	106	RO_compatibleFlags dd ?
107	ends	107	ends
108		108
109	; ext4 extent tree	109	; ext4 extent tree
110	struct NODEHEADER ; tree node header	110	struct NODEHEADER ; tree node header
111	magic dw ? ; 0xF30A	111	magic dw ? ; 0xF30A
112	entriesFolow dw ?	112	entriesFolow dw ?
113	entriesMax dw ?	113	entriesMax dw ?
114	currentDepth dw ?	114	currentDepth dw ?
115	generation dd ?	115	generation dd ?
116	ends	116	ends
117		117
118	struct INDEX ; root/branch	118	struct INDEX ; root/branch
119	fileBlock dd ?	119	fileBlock dd ?
120	nodeBlock dd ?	120	nodeBlock dd ?
121	nodeBlockHigh dw ?	121	nodeBlockHigh dw ?
122	reserved dw ?	122	reserved dw ?
123	ends	123	ends
124		124
125	struct EXTENT ; leaf	125	struct EXTENT ; leaf
126	fileBlock dd ?	126	fileBlock dd ?
127	blocksCount dw ?	127	blocksCount dw ?
128	fsBlockHigh dw ?	128	fsBlockHigh dw ?
129	fsBlock dd ?	129	fsBlock dd ?
130	ends	130	ends
131		131
132	ROOT_INODE = 2	132	ROOT_INODE = 2
133	PERMISSIONS = 110110110b	133	PERMISSIONS = 110110110b
134	EXTENTS_USED = 80000h	134	EXTENTS_USED = 80000h
135	TYPE_MASK = 0F000h	135	TYPE_MASK = 0F000h
136	FLAG_FILE = 8000h	136	FLAG_FILE = 8000h
137	DIRECTORY = 4000h	137	DIRECTORY = 4000h
138	DIR_FLAG_FILE = 1	138	DIR_FLAG_FILE = 1
139	DIR_DIRECTORY = 2	139	DIR_DIRECTORY = 2
140	KOS_HIDDEN = 2	140	KOS_HIDDEN = 2
141	KOS_DIRECTORY = 10h	141	KOS_DIRECTORY = 10h
142	READ_ONLY = 1	142	READ_ONLY = 1
143		143
144	; Implemented "incompatible" features:	144	; Implemented "incompatible" features:
145	; 2 = have file type in directory entry	145	; 2 = have file type in directory entry
146	; 40h = extents	146	; 40h = extents
147	; 200h = flexible block groups	147	; 200h = flexible block groups
148	INCOMPATIBLE_SUPPORT = 242h	148	INCOMPATIBLE_SUPPORT = 242h
149	; Read only support for "incompatible" features:	149	; Read only support for "incompatible" features:
150	INCOMPATIBLE_READ_SUPPORT = 240h	150	INCOMPATIBLE_READ_SUPPORT = 240h
151		151
152	; Implemented "read-only" features:	152	; Implemented "read-only" features:
153	; 1 = sparse superblock	153	; 1 = sparse superblock
154	; 2 = 64-bit file size	154	; 2 = 64-bit file size
155	READ_ONLY_SUPPORT = 3	155	READ_ONLY_SUPPORT = 3
156		156
157	struct EXTFS PARTITION	157	struct EXTFS PARTITION
158	Lock MUTEX	158	Lock MUTEX
159	mountType dd ?	159	mountType dd ?
160	sectorsPerBlockLog dd ? ; shift for 512	160	sectorsPerBlockLog dd ? ; shift for 512
161	bytesPerBlock dd ?	161	bytesPerBlock dd ?
162	sectorsPerBlock dd ?	162	sectorsPerBlock dd ?
163	dwordsPerBlock dd ?	163	dwordsPerBlock dd ?
164	dwordsPerBranch dd ? ; dwordsPerBlock ^ 2	164	dwordsPerBranch dd ? ; dwordsPerBlock ^ 2
165	mainBlockBuffer dd ?	165	mainBlockBuffer dd ?
166	tempBlockBuffer dd ?	166	tempBlockBuffer dd ?
167	align0 rb 200h-EXTFS.align0	167	align0 rb 200h-EXTFS.align0
168	superblock SUPERBLOCK	168	superblock SUPERBLOCK
169	align1 rb 400h-EXTFS.align1	169	align1 rb 400h-EXTFS.align1
170	rootInodeBuffer INODE	170	rootInodeBuffer INODE
171	align2 rb 600h-EXTFS.align2	171	align2 rb 600h-EXTFS.align2
172	inodeBuffer INODE	172	inodeBuffer INODE
173	align3 rb 800h-EXTFS.align3	173	align3 rb 800h-EXTFS.align3
174	ends	174	ends
175		175
176	; mount if it's a valid EXT partition	176	; mount if it's a valid EXT partition
177	ext2_create_partition:	177	ext2_create_partition:
178	; in:	178	; in:
179	; ebp -> PARTITION structure	179	; ebp -> PARTITION structure
180	; ebx -> boot sector	180	; ebx -> boot sector
181	; ebx+512 -> buffer	181	; ebx+512 -> buffer
182	; out:	182	; out:
183	; eax -> EXTFS structure, 0 = not EXT	183	; eax -> EXTFS structure, 0 = not EXT
184	push ebx	184	push ebx
185	cmp dword [esi+DISK.MediaInfo.SectorSize], 512	185	cmp dword [esi+DISK.MediaInfo.SectorSize], 512
186	jnz .fail	186	jnz .fail
187	mov eax, 2	187	mov eax, 2
188	add ebx, 512	188	add ebx, 512
189	call fs_read32_sys	189	call fs_read32_sys
190	test eax, eax	190	test eax, eax
191	jnz .fail	191	jnz .fail
192	cmp [ebx+SUPERBLOCK.magic], 0xEF53	192	cmp [ebx+SUPERBLOCK.magic], 0xEF53
193	jne .fail	193	jne .fail
194	cmp [ebx+SUPERBLOCK.state], 1	194	cmp [ebx+SUPERBLOCK.state], 1
195	ja .fail	195	ja .fail
196	test [ebx+SUPERBLOCK.incompatibleFlags], not INCOMPATIBLE_SUPPORT	196	test [ebx+SUPERBLOCK.incompatibleFlags], not INCOMPATIBLE_SUPPORT
197	jnz .fail	197	jnz .fail
198	cmp [ebx+SUPERBLOCK.sectorsPerBlockLog], 6 ; 64KB	198	cmp [ebx+SUPERBLOCK.sectorsPerBlockLog], 6 ; 64KB
199	ja .fail	199	ja .fail
200	cmp [ebx+SUPERBLOCK.inodeSize], 1024	200	cmp [ebx+SUPERBLOCK.inodeSize], 1024
201	ja .fail	201	ja .fail
202	cmp [ebx+SUPERBLOCK.blocksPerGroup], 0	202	cmp [ebx+SUPERBLOCK.blocksPerGroup], 0
203	je .fail	203	je .fail
204	cmp [ebx+SUPERBLOCK.inodesPerGroup], 0	204	cmp [ebx+SUPERBLOCK.inodesPerGroup], 0
205	je .fail	205	je .fail
206	movi eax, sizeof.EXTFS	206	movi eax, sizeof.EXTFS
207	call malloc	207	call malloc
208	test eax, eax	208	test eax, eax
209	jz .fail	209	jz .fail
210	mov ecx, dword [ebp+PARTITION.FirstSector]	210	mov ecx, dword [ebp+PARTITION.FirstSector]
211	mov dword [eax+EXTFS.FirstSector], ecx	211	mov dword [eax+EXTFS.FirstSector], ecx
212	mov ecx, dword [ebp+PARTITION.FirstSector+4]	212	mov ecx, dword [ebp+PARTITION.FirstSector+4]
213	mov dword [eax+EXTFS.FirstSector+4], ecx	213	mov dword [eax+EXTFS.FirstSector+4], ecx
214	mov ecx, dword [ebp+PARTITION.Length]	214	mov ecx, dword [ebp+PARTITION.Length]
215	mov dword [eax+EXTFS.Length], ecx	215	mov dword [eax+EXTFS.Length], ecx
216	mov ecx, dword [ebp+PARTITION.Length+4]	216	mov ecx, dword [ebp+PARTITION.Length+4]
217	mov dword [eax+EXTFS.Length+4], ecx	217	mov dword [eax+EXTFS.Length+4], ecx
218	mov ecx, [ebp+PARTITION.Disk]	218	mov ecx, [ebp+PARTITION.Disk]
219	mov [eax+EXTFS.Disk], ecx	219	mov [eax+EXTFS.Disk], ecx
220	mov [eax+EXTFS.FSUserFunctions], ext_user_functions	220	mov [eax+EXTFS.FSUserFunctions], ext_user_functions
221		221
222	push ebp esi edi	222	push ebp esi edi
223	mov ebp, eax	223	mov ebp, eax
224	lea ecx, [eax+EXTFS.Lock]	224	lea ecx, [eax+EXTFS.Lock]
225	call mutex_init	225	call mutex_init
226	mov esi, ebx	226	mov esi, ebx
227	lea edi, [ebp+EXTFS.superblock]	227	lea edi, [ebp+EXTFS.superblock]
228	mov ecx, 512/4	228	mov ecx, 512/4
229	rep movsd ; copy superblock	229	rep movsd ; copy superblock
230	mov ecx, [ebx+SUPERBLOCK.sectorsPerBlockLog]	230	mov ecx, [ebx+SUPERBLOCK.sectorsPerBlockLog]
231	inc ecx	231	inc ecx
232	mov [ebp+EXTFS.sectorsPerBlockLog], ecx	232	mov [ebp+EXTFS.sectorsPerBlockLog], ecx
233	mov eax, 1	233	mov eax, 1
234	shl eax, cl	234	shl eax, cl
235	mov [ebp+EXTFS.sectorsPerBlock], eax	235	mov [ebp+EXTFS.sectorsPerBlock], eax
236	shl eax, 9	236	shl eax, 9
237	mov [ebp+EXTFS.bytesPerBlock], eax	237	mov [ebp+EXTFS.bytesPerBlock], eax
238	shl eax, 1	238	shl eax, 1
239	push eax	239	push eax
240	shr eax, 3	240	shr eax, 3
241	mov [ebp+EXTFS.dwordsPerBlock], eax	241	mov [ebp+EXTFS.dwordsPerBlock], eax
242	mul eax	242	mul eax
243	mov [ebp+EXTFS.dwordsPerBranch], eax	243	mov [ebp+EXTFS.dwordsPerBranch], eax
244	call kernel_alloc	244	call kernel_alloc
245	test eax, eax	245	test eax, eax
246	jz .error	246	jz .error
247	mov [ebp+EXTFS.mainBlockBuffer], eax	247	mov [ebp+EXTFS.mainBlockBuffer], eax
248	add eax, [ebp+EXTFS.bytesPerBlock]	248	add eax, [ebp+EXTFS.bytesPerBlock]
249	mov [ebp+EXTFS.tempBlockBuffer], eax	249	mov [ebp+EXTFS.tempBlockBuffer], eax
250	mov [ebp+EXTFS.mountType], 0	250	mov [ebp+EXTFS.mountType], 0
251	test [ebx+SUPERBLOCK.RO_compatibleFlags], not READ_ONLY_SUPPORT	251	test [ebx+SUPERBLOCK.RO_compatibleFlags], not READ_ONLY_SUPPORT
252	jnz .read_only	252	jnz .read_only
253	test [ebx+SUPERBLOCK.incompatibleFlags], INCOMPATIBLE_READ_SUPPORT	253	test [ebx+SUPERBLOCK.incompatibleFlags], INCOMPATIBLE_READ_SUPPORT
254	jz @f	254	jz @f
255	.read_only:	255	.read_only:
256	or [ebp+EXTFS.mountType], READ_ONLY	256	or [ebp+EXTFS.mountType], READ_ONLY
257	@@: ; read root inode	257	@@: ; read root inode
258	lea ebx, [ebp+EXTFS.rootInodeBuffer]	258	lea ebx, [ebp+EXTFS.rootInodeBuffer]
259	mov eax, ROOT_INODE	259	mov eax, ROOT_INODE
260	call readInode	260	call readInode
261	test eax, eax	261	test eax, eax
262	jnz @f	262	jnz @f
263	mov eax, ebp	263	mov eax, ebp
264	pop edi esi ebp ebx	264	pop edi esi ebp ebx
265	ret	265	ret
266		266
267	@@:	267	@@:
268	stdcall kernel_free, [ebp+EXTFS.mainBlockBuffer]	268	stdcall kernel_free, [ebp+EXTFS.mainBlockBuffer]
269	.error:	269	.error:
270	mov eax, ebp	270	mov eax, ebp
271	call free	271	call free
272	pop edi esi ebp	272	pop edi esi ebp
273	.fail:	273	.fail:
274	pop ebx	274	pop ebx
275	xor eax, eax	275	xor eax, eax
276	ret	276	ret
277		277
278	; unmount EXT partition	278	; unmount EXT partition
279	ext_free:	279	ext_free:
280	; in: eax -> EXTFS structure	280	; in: eax -> EXTFS structure
281	push eax	281	push eax
282	stdcall kernel_free, [eax+EXTFS.mainBlockBuffer]	282	stdcall kernel_free, [eax+EXTFS.mainBlockBuffer]
283	pop eax	283	pop eax
284	jmp free	284	jmp free
285		285
286	extfsWriteBlock:	286	extfsWriteBlock:
287	push fs_write64_sys	287	push fs_write64_sys
288	jmp @f	288	jmp @f
289	; in:	-
290	; eax = block number	289	; in: eax = block number, ebx -> buffer
291	; ebx -> buffer	-
292	extfsReadBlock:	290	extfsReadBlock:
293	push fs_read64_sys	291	push fs_read64_sys
294	@@:	292	@@:
295	push ecx edx	293	push ecx edx
296	mov ecx, [ebp+EXTFS.sectorsPerBlock]	294	mov ecx, [ebp+EXTFS.sectorsPerBlock]
297	mul ecx	295	mul ecx
298	call dword[esp+8]	296	call dword[esp+8]
299	pop edx ecx	297	pop edx ecx
300	add esp, 4	298	add esp, 4
301	test eax, eax	299	test eax, eax
302	jz @f	300	jz @f
303	movi eax, ERROR_DEVICE	301	movi eax, ERROR_DEVICE
304	stc	302	stc
305	@@:	303	@@:
306	ret	304	ret
307		305
308	extfsReadDescriptor:	306	extfsReadDescriptor:
309	; in: eax = block group number	307	; in: eax = block group number
310	; out:	308	; out:
311	; [ebp+EXTFS.tempBlockBuffer] -> relevant block	309	; [ebp+EXTFS.tempBlockBuffer] -> relevant block
312	; eax -> block group descriptor, 0 = error	310	; eax -> block group descriptor, 0 = error
313	push edx ebx	311	push edx ebx
314	shl eax, 5	312	shl eax, 5
315	xor edx, edx	313	xor edx, edx
316	div [ebp+EXTFS.bytesPerBlock]	314	div [ebp+EXTFS.bytesPerBlock]
317	add eax, [ebp+EXTFS.superblock.firstGroupBlock]	315	add eax, [ebp+EXTFS.superblock.firstGroupBlock]
318	inc eax	316	inc eax
319	mov ebx, [ebp+EXTFS.tempBlockBuffer]	317	mov ebx, [ebp+EXTFS.tempBlockBuffer]
320	call extfsReadBlock	318	call extfsReadBlock
321	jc .fail	319	jc .fail
322	mov eax, ebx	320	mov eax, ebx
323	add eax, edx	321	add eax, edx
324	@@:	322	@@:
325	pop ebx edx	323	pop ebx edx
326	ret	324	ret
327		325
328	.fail:	326	.fail:
329	xor eax, eax	327	xor eax, eax
330	stc	328	stc
331	jmp @b	329	jmp @b
332		330
333	extfsWriteDescriptor:	331	extfsWriteDescriptor:
334	; in:	332	; in:
335	; eax = block group number	333	; eax = block group number
336	; [ebp+EXTFS.tempBlockBuffer] -> relevant block	334	; [ebp+EXTFS.tempBlockBuffer] -> relevant block
337	push edx ebx	335	push edx ebx
338	shl eax, 5	336	shl eax, 5
339	xor edx, edx	337	xor edx, edx
340	div [ebp+EXTFS.bytesPerBlock]	338	div [ebp+EXTFS.bytesPerBlock]
341	add eax, [ebp+EXTFS.superblock.firstGroupBlock]	339	add eax, [ebp+EXTFS.superblock.firstGroupBlock]
342	inc eax	340	inc eax
343	mov ebx, [ebp+EXTFS.tempBlockBuffer]	341	mov ebx, [ebp+EXTFS.tempBlockBuffer]
344	call extfsWriteBlock	342	call extfsWriteBlock
345	pop ebx edx	343	pop ebx edx
346	ret	344	ret
347		345
348	extfsResourceFree:	346	extfsResourceFree:
349	; in:	347	; in:
350	; ecx=0 -> block, ecx=1 -> inode	348	; ecx=0 -> block, ecx=1 -> inode
351	; eax = block/inode number	349	; eax = block/inode number
352	push ebx edx	350	push ebx edx
353	sub eax, [ebp+EXTFS.superblock.firstGroupBlock]	351	sub eax, [ebp+EXTFS.superblock.firstGroupBlock]
354	xor edx, edx	352	xor edx, edx
355	div [ebp+EXTFS.superblock.blocksPerGroup]	353	div [ebp+EXTFS.superblock.blocksPerGroup]
356	push eax edx	354	push edx eax
357	call extfsReadDescriptor	355	call extfsReadDescriptor
358	jc .fail	356	jc .fail2
359	inc [eax+BGDESCR.blocksFree+ecx*2]	357	inc [eax+BGDESCR.blocksFree+ecx*2]
360	mov eax, [eax+BGDESCR.blockBitmap+ecx*4]	358	mov edx, [eax+BGDESCR.blockBitmap+ecx*4]
-		359	pop eax
361	mov ebx, [ebp+EXTFS.mainBlockBuffer]	360	call extfsWriteDescriptor
-		361	jc .fail
362	mov edx, eax	362	mov eax, edx
-		363	mov ebx, [ebp+EXTFS.tempBlockBuffer]
363	call extfsReadBlock	364	call extfsReadBlock
364	jc .fail	365	jc .fail
365	pop eax	366	pop eax
366	push edx	367	push edx
367	mov edx, eax	368	mov edx, eax
368	and edx, 31	369	and edx, 31
369	shr eax, 5	370	shr eax, 5
370	shl eax, 2	371	shl eax, 2
371	add eax, [ebp+EXTFS.mainBlockBuffer]	372	add eax, [ebp+EXTFS.tempBlockBuffer]
372	btr [eax], edx	373	btr [eax], edx
373	pop eax	374	pop eax
374	mov ebx, [ebp+EXTFS.mainBlockBuffer]	375	mov ebx, [ebp+EXTFS.tempBlockBuffer]
375	call extfsWriteBlock	376	call extfsWriteBlock
376	jc @f	377	jc @f
377	inc [ebp+EXTFS.superblock.blocksFree+ecx*4]	378	inc [ebp+EXTFS.superblock.blocksFree+ecx*4]
378	pop eax	-
379	call extfsWriteDescriptor	-
380	.ret:	379	@@:
381	pop edx ebx	380	pop edx ebx
382	ret	381	ret
383		382
384	.fail:	383	.fail2:
385	pop eax	384	pop eax
386	@@:	385	.fail:
387	pop eax	386	pop eax
388	movi eax, ERROR_DEVICE	387	movi eax, ERROR_DEVICE
389	jmp .ret	388	jmp @b
390		389
391	freeDoublyIndirectBlock:	390	freeDoublyIndirectBlock:
392	; in: eax = doubly-indirect block number	391	; in: eax = doubly-indirect block number
393	; out: eax=1 -> finished	392	; out: eax=1 -> finished
394	test eax, eax	393	test eax, eax
395	jz .complete	394	jz .complete
396	push eax	395	push eax
397	mov ebx, [ebp+EXTFS.tempBlockBuffer]	396	mov ebx, [ebp+EXTFS.mainBlockBuffer]
398	call extfsReadBlock	397	call extfsReadBlock
399	pop eax	398	pop eax
400	jc .ret	399	jc .ret
401	xor ecx, ecx	400	xor ecx, ecx
402	call extfsResourceFree	401	call extfsResourceFree
403	mov edx, ebx	402	mov edx, ebx
404	add edx, [ebp+EXTFS.bytesPerBlock]	403	add edx, [ebp+EXTFS.bytesPerBlock]
405	@@:	404	@@:
406	mov eax, [ebx]	405	mov eax, [ebx]
407	test eax, eax	406	test eax, eax
408	jz .complete	407	jz .complete
409	call extfsResourceFree	408	call extfsResourceFree
410	add ebx, 4	409	add ebx, 4
411	cmp ebx, edx	410	cmp ebx, edx
412	jb @b	411	jb @b
413	.ret:	412	.ret:
414	xor eax, eax	413	xor eax, eax
415	ret	414	ret
416		415
417	.complete:	416	.complete:
418	inc eax	417	inc eax
419	ret	418	ret
420		419
421	inodeBlockAlloc:	420	inodeBlockAlloc: ; also erases
422	; in: esi -> inode, eax = inode number	421	; in: esi -> inode, eax = inode number
423	; out: ebx = block number	-
424	call extfsBlockAlloc	-
425	jc @f	-
426	mov eax, [ebp+EXTFS.sectorsPerBlock]	-
427	add [esi+INODE.sectorsUsed], eax	-
428	xor eax, eax	-
429	@@:	-
430	ret	-
431		-
432	extfsBlockAlloc: ; also erases	-
433	; in: eax = inode number	-
434	; out: ebx = block number	422	; out: ebx = block number
435	xor ebx, ebx	423	xor ebx, ebx
436	call extfsResourceAlloc	424	call extfsResourceAlloc
437	jc @f	425	jc @f
438	push ebx ecx edi	426	push ebx ecx edi
439	mov ecx, [ebp+EXTFS.dwordsPerBlock]	427	mov ecx, [ebp+EXTFS.dwordsPerBlock]
440	mov edi, [ebp+EXTFS.tempBlockBuffer]	428	mov edi, [ebp+EXTFS.tempBlockBuffer]
441	mov ebx, edi	429	mov ebx, edi
442	xor eax, eax	430	xor eax, eax
443	rep stosd	431	rep stosd
444	pop edi ecx	432	pop edi ecx eax
445	mov eax, [esp]	433	push eax
446	call extfsWriteBlock	434	call extfsWriteBlock
447	pop ebx	435	pop ebx
-		436	jc @f
-		437	mov eax, [ebp+EXTFS.sectorsPerBlock]
-		438	add [esi+INODE.sectorsUsed], eax
-		439	xor eax, eax
448	@@:	440	@@:
449	ret	441	ret
450		442
451	extfsResourceAlloc:	443	extfsResourceAlloc:
452	; in:	444	; in:
453	; eax = inode number	445	; eax = inode number
454	; ebx=0 -> block, ebx=1 -> inode	446	; ebx=0 -> block, ebx=1 -> inode
455	; out:	447	; out:
456	; ebx = block/inode number	448	; ebx = block/inode number
457	push ecx edx esi edi	449	push ecx edx esi edi
458	dec eax	450	dec eax
459	xor edx, edx	451	xor edx, edx
460	div [ebp+EXTFS.superblock.inodesPerGroup]	452	div [ebp+EXTFS.superblock.inodesPerGroup]
461	push eax eax	453	push eax eax
462	mov esi, .forward ; search forward, then backward	454	mov esi, .forward ; search forward, then backward
463	.test_block_group:	455	.test_block_group:
464	call extfsReadDescriptor	456	call extfsReadDescriptor
465	jc .fail	457	jc .fail
466	dec [eax+BGDESCR.blocksFree+ebx*2]	458	dec [eax+BGDESCR.blocksFree+ebx*2]
-		459	js .next
467	mov eax, [eax+BGDESCR.blockBitmap+ebx*4]	460	mov edx, [eax+BGDESCR.blockBitmap+ebx*4]
-		461	mov eax, [esp]
-		462	call extfsWriteDescriptor
-		463	jc .fail
468	push ebx	464	push ebx
469	mov ebx, [ebp+EXTFS.mainBlockBuffer]	465	mov eax, edx
470	mov edx, eax	466	mov ebx, [ebp+EXTFS.tempBlockBuffer]
471	mov edi, ebx	467	mov edi, ebx
472	call extfsReadBlock	468	call extfsReadBlock
473	pop ebx	469	pop ebx
474	jc .fail	470	jc .fail
475	mov ecx, [ebp+EXTFS.superblock.blocksPerGroup+ebx*8]	471	mov ecx, [ebp+EXTFS.superblock.blocksPerGroup+ebx*8]
476	or eax, -1	472	or eax, -1
477	shr ecx, 5	473	shr ecx, 5
478	jz .next	474	jz .next
479	repz scasd	475	repz scasd
480	jz .next	476	jz .next
481	sub edi, 4	477	sub edi, 4
482	mov eax, [edi]	478	mov eax, [edi]
483	not eax	479	not eax
484	bsf eax, eax	480	bsf eax, eax
485	bts [edi], eax	481	bts [edi], eax
486	sub edi, [ebp+EXTFS.mainBlockBuffer]	482	sub edi, [ebp+EXTFS.tempBlockBuffer]
487	shl edi, 3	483	shl edi, 3
488	add eax, edi	484	add eax, edi
489	mov ecx, eax	485	mov ecx, eax

Subversion Repositories Kolibri OS

(root)/kernel/trunk/fs/ext.inc – Rev 6558 → 6575