include 'xfs.inc' ; ; This file contains XFS related code. ; For more information on XFS check sources below. ; ; 1. XFS Filesystem Structure, 2nd Edition, Revision 1. Silicon Graphics Inc. 2006 ; 2. Linux source http://kernel.org ; ; test partition type (valid XFS one?) ; alloc and fill XFS (see xfs.inc) structure ; this function is called for each partition ; returns 0 (not XFS or invalid) / pointer to partition structure xfs_create_partition: push ebx ecx edx esi edi cmp dword[ebx + xfs_sb.sb_magicnum], XFS_SB_MAGIC ; signature jne .error ; TODO: check XFS.versionnum and XFS.features2 ; print superblock params for debugging (waiting for bug reports) movi eax, sizeof.XFS call malloc test eax, eax jz .error ; standard partition initialization, common for all file systems mov edi, eax mov eax, dword[ebp + PARTITION.FirstSector] mov dword[edi + XFS.FirstSector], eax mov eax, dword[ebp + PARTITION.FirstSector + 4] mov dword[edi + XFS.FirstSector + 4], eax mov eax, dword[ebp + PARTITION.Length] mov dword[edi + XFS.Length], eax mov eax, dword[ebp + PARTITION.Length + 4] mov dword[edi + XFS.Length + 4], eax mov eax, [ebp + PARTITION.Disk] mov [edi + XFS.Disk], eax mov [edi + XFS.FSUserFunctions], xfs_user_functions ; here we initialize only one mutex so far (for the entire partition) ; XFS potentially allows parallel r/w access to several AGs, keep it in mind for SMP times lea ecx, [edi + XFS.Lock] call mutex_init ; read superblock and fill just allocated XFS partition structure mov eax, [ebx + xfs_sb.sb_blocksize] bswap eax ; XFS is big endian mov [edi + XFS.blocksize], eax movzx eax, word[ebx + xfs_sb.sb_sectsize] xchg al, ah mov [edi + XFS.sectsize], eax movzx eax, word[ebx + xfs_sb.sb_versionnum] xchg al, ah mov [edi + XFS.versionnum], eax mov eax, [ebx + xfs_sb.sb_features2] bswap eax mov [edi + XFS.features2], eax movzx eax, word[ebx + xfs_sb.sb_inodesize] xchg al, ah mov [edi + XFS.inodesize], eax movzx eax, word[ebx + xfs_sb.sb_inopblock] ; inodes per block xchg al, ah mov [edi + XFS.inopblock], eax movzx eax, byte[ebx + xfs_sb.sb_blocklog] ; log2 of block size, in bytes mov [edi + XFS.blocklog], eax movzx eax, byte[ebx + xfs_sb.sb_sectlog] mov [edi + XFS.sectlog], eax movzx eax, byte[ebx + xfs_sb.sb_inodelog] mov [edi + XFS.inodelog], eax movzx eax, byte[ebx + xfs_sb.sb_inopblog] mov [edi + XFS.inopblog], eax movzx eax, byte[ebx + xfs_sb.sb_dirblklog] mov [edi + XFS.dirblklog], eax mov eax, dword[ebx + xfs_sb.sb_rootino + 4] ; bswap eax ; big mov dword[edi + XFS.rootino + 0], eax ; endian mov eax, dword[ebx + xfs_sb.sb_rootino + 0] ; 64bit bswap eax ; number mov dword[edi + XFS.rootino + 4], eax ; mov eax, [edi + XFS.blocksize] mov ecx, [edi + XFS.dirblklog] shl eax, cl mov [edi + XFS.dirblocksize], eax ; blocks for files, dirblocks for directories ; sector is always smaller than block ; so precalculate shift order to allow faster sector_num->block_num conversion mov ecx, [edi + XFS.blocklog] sub ecx, [edi + XFS.sectlog] mov [edi + XFS.blockmsectlog], ecx mov eax, 1 shl eax, cl mov [edi + XFS.sectpblock], eax ; shift order for inode_num->block_num conversion mov eax, [edi + XFS.blocklog] sub eax, [edi + XFS.inodelog] mov [edi + XFS.inodetoblocklog], eax mov eax, [ebx + xfs_sb.sb_agblocks] bswap eax mov [edi + XFS.agblocks], eax movzx ecx, byte[ebx + xfs_sb.sb_agblklog] mov [edi + XFS.agblklog], ecx ; get the mask for block numbers ; block numbers are AG relative! ; bitfield length may vary between partitions mov eax, 1 shl eax, cl dec eax mov dword[edi + XFS.agblockmask + 0], eax mov eax, 1 sub ecx, 32 jc @f shl eax, cl @@: dec eax mov dword[edi + XFS.agblockmask + 4], eax ; calculate magic offsets for directories mov ecx, [edi + XFS.blocklog] mov eax, XFS_DIR2_LEAF_OFFSET AND 0xffffffff ; lo mov edx, XFS_DIR2_LEAF_OFFSET SHR 32 ; hi shrd eax, edx, cl mov [edi + XFS.dir2_leaf_offset_blocks], eax mov ecx, [edi + XFS.blocklog] mov eax, XFS_DIR2_FREE_OFFSET AND 0xffffffff ; lo mov edx, XFS_DIR2_FREE_OFFSET SHR 32 ; hi shrd eax, edx, cl mov [edi + XFS.dir2_free_offset_blocks], eax ; mov ecx, [edi + XFS.dirblklog] ; mov eax, [edi + XFS.blocksize] ; shl eax, cl ; mov [edi + XFS.dirblocksize], eax mov eax, [edi + XFS.blocksize] call malloc test eax, eax jz .error mov [edi + XFS.cur_block], eax ; we do need XFS.blocksize bytes for single inode ; minimal file system structure is block, inodes are packed in blocks mov eax, [edi + XFS.blocksize] call malloc test eax, eax jz .error mov [edi + XFS.cur_inode], eax ; temporary inode ; used for browsing directories mov eax, [edi + XFS.blocksize] call malloc test eax, eax jz .error mov [edi + XFS.tmp_inode], eax ; current sector ; only for sector size structures like AGI ; inodes has usually the same size, but never store them here mov eax, [edi + XFS.sectsize] call malloc test eax, eax jz .error mov [edi + XFS.cur_sect], eax ; current directory block mov eax, [edi + XFS.dirblocksize] call malloc test eax, eax jz .error mov [edi + XFS.cur_dirblock], eax .quit: mov eax, edi ; return pointer to allocated XFS partition structure pop edi esi edx ecx ebx ret .error: xor eax, eax pop edi esi edx ecx ebx ret iglobal align 4 xfs_user_functions: dd xfs_free dd (xfs_user_functions_end - xfs_user_functions - 4) / 4 dd xfs_Read dd xfs_ReadFolder dd 0;xfs_Rewrite dd 0;xfs_Write dd 0;xfs_SetFileEnd dd xfs_GetFileInfo dd 0;xfs_SetFileInfo dd 0 dd 0;xfs_Delete dd 0;xfs_CreateFolder xfs_user_functions_end: endg ; lock partition access mutex proc xfs_lock ;DEBUGF 1,"xfs_lock\n" lea ecx, [ebp + XFS.Lock] jmp mutex_lock endp ; unlock partition access mutex proc xfs_unlock ;DEBUGF 1,"xfs_unlock\n" lea ecx, [ebp + XFS.Lock] jmp mutex_unlock endp ; free all the allocated memory ; called on partition destroy proc xfs_free push ebp xchg ebp, eax stdcall kernel_free, [ebp + XFS.cur_block] stdcall kernel_free, [ebp + XFS.cur_inode] stdcall kernel_free, [ebp + XFS.cur_sect] stdcall kernel_free, [ebp + XFS.cur_dirblock] stdcall kernel_free, [ebp + XFS.tmp_inode] xchg ebp, eax call free pop ebp ret endp ;--------------------------------------------------------------- ; block number (AG relative) ; eax -- inode_lo ; edx -- inode_hi ; ebx -- buffer ;--------------------------------------------------------------- xfs_read_block: push ebx esi push edx push eax ; XFS block numbers are AG relative ; they come in bitfield form of concatenated AG and block numbers ; to get absolute block number for fs_read32_sys we should ; 1. extract AG number (using precalculated mask) ; 2. multiply it by the AG size in blocks ; 3. add AG relative block number ; 1. mov ecx, [ebp + XFS.agblklog] shrd eax, edx, cl shr edx, cl ; 2. mul dword[ebp + XFS.agblocks] pop ecx pop esi and ecx, dword[ebp + XFS.agblockmask + 0] and esi, dword[ebp + XFS.agblockmask + 4] ; 3. add eax, ecx adc edx, esi ;DEBUGF 1,"read block: 0x%x%x\n",edx,eax ; there is no way to read file system block at once, therefore we ; 1. calculate the number of sectors first ; 2. and then read them in series ; 1. mov ecx, [ebp + XFS.blockmsectlog] shld edx, eax, cl shl eax, cl mov esi, [ebp + XFS.sectpblock] ; 2. .next_sector: push eax edx call fs_read32_sys mov ecx, eax pop edx eax test ecx, ecx jnz .error add eax, 1 ; be ready to fs_read64_sys adc edx, 0 add ebx, [ebp + XFS.sectsize] ; update buffer offset dec esi jnz .next_sector .quit: xor eax, eax pop esi ebx ret .error: mov eax, ecx pop esi ebx ret ;--------------------------------------------------------------- ; push buffer ; push startblock_hi ; push startblock_lo ; call xfs_read_dirblock ; test eax, eax ;--------------------------------------------------------------- xfs_read_dirblock: ;mov eax, [esp + 4] ;mov edx, [esp + 8] ;DEBUGF 1,"read dirblock at: %d %d\n",edx,eax ;DEBUGF 1,"dirblklog: %d\n",[ebp + XFS.dirblklog] push ebx esi mov eax, [esp + 12] ; startblock_lo mov edx, [esp + 16] ; startblock_hi mov ebx, [esp + 20] ; buffer ; dirblock >= block ; read dirblocks by blocks mov ecx, [ebp + XFS.dirblklog] mov esi, 1 shl esi, cl .next_block: push eax edx call xfs_read_block mov ecx, eax pop edx eax test ecx, ecx jnz .error add eax, 1 ; be ready to fs_read64_sys adc edx, 0 add ebx, [ebp + XFS.blocksize] dec esi jnz .next_block .quit: xor eax, eax pop esi ebx ret 12 .error: mov eax, ecx pop esi ebx ret 12 ;--------------------------------------------------------------- ; push buffer ; push inode_hi ; push inode_lo ; call xfs_read_inode ; test eax, eax ;--------------------------------------------------------------- xfs_read_inode: ;DEBUGF 1,"reading inode: 0x%x%x\n",[esp+8],[esp+4] push ebx mov eax, [esp + 8] ; inode_lo mov edx, [esp + 12] ; inode_hi mov ebx, [esp + 16] ; buffer ; inodes are packed into blocks ; 1. calculate block number ; 2. read the block ; 3. add inode offset to block base address ; 1. mov ecx, [ebp + XFS.inodetoblocklog] shrd eax, edx, cl shr edx, cl ; 2. call xfs_read_block test eax, eax jnz .error ; note that inode numbers should be first extracted from bitfields using mask mov eax, [esp + 8] mov edx, 1 mov ecx, [ebp + XFS.inopblog] shl edx, cl dec edx ; get inode number mask and eax, edx ; apply mask mov ecx, [ebp + XFS.inodelog] shl eax, cl add ebx, eax cmp word[ebx], XFS_DINODE_MAGIC ; test signature jne .error .quit: xor eax, eax mov edx, ebx pop ebx ret 12 .error: movi eax, ERROR_FS_FAIL mov edx, ebx pop ebx ret 12 ;---------------------------------------------------------------- ; push encoding ; ASCII / UNICODE ; push src ; inode ; push dst ; bdfe ; push entries_to_read ; push start_number ; from 0 ;---------------------------------------------------------------- xfs_dir_get_bdfes: DEBUGF 1,"xfs_dir_get_bdfes: %d entries from %d\n",[esp+8],[esp+4] sub esp, 4 ; local vars push ecx edx esi edi mov ebx, [esp + 36] ; src mov edx, [esp + 32] ; dst mov ecx, [esp + 24] ; start_number ; define directory ondisk format and jump to corresponding label cmp byte[ebx + xfs_inode.di_core.di_format], XFS_DINODE_FMT_LOCAL jne .not_shortdir jmp .shortdir .not_shortdir: cmp byte[ebx + xfs_inode.di_core.di_format], XFS_DINODE_FMT_EXTENTS jne .not_blockdir mov eax, [ebx + xfs_inode.di_core.di_nextents] bswap eax cmp eax, 1 jne .not_blockdir jmp .blockdir .not_blockdir: cmp byte[ebx + xfs_inode.di_core.di_format], XFS_DINODE_FMT_EXTENTS jne .not_leafdir mov eax, [ebx + xfs_inode.di_core.di_nextents] bswap eax cmp eax, 4 ja .not_leafdir jmp .leafdir .not_leafdir: cmp byte[ebx + xfs_inode.di_core.di_format], XFS_DINODE_FMT_EXTENTS jne .not_nodedir jmp .nodedir .not_nodedir: cmp byte[ebx + xfs_inode.di_core.di_format], XFS_DINODE_FMT_BTREE jne .not_btreedir jmp .btreedir .not_btreedir: movi eax, ERROR_FS_FAIL jmp .error ; short form directory (all the data fits into inode) .shortdir: ;DEBUGF 1,"shortdir\n", movzx eax, word[ebx + xfs_inode.di_u + xfs_dir2_sf_hdr.count] test al, al ; is count zero? jnz @f ; if not, use it (i8count must be zero then) shr eax, 8 ; use i8count @@: add eax, 1 ; '..' and '.' are implicit mov dword[edx + 0], 1 ; version mov [edx + 8], eax ; total entries sub eax, [esp + 24] ; start number cmp eax, [esp + 28] ; entries to read jbe @f mov eax, [esp + 28] @@: mov [esp + 28], eax mov [edx + 4], eax ; number of actually read entries mov [ebp + XFS.entries_read], eax ; inode numbers are often saved as 4 bytes (iff they fit) ; compute the length of inode numbers mov eax, 4 ; 4 by default cmp byte[ebx + xfs_inode.di_u + xfs_dir2_sf_hdr.i8count], 0 je @f add eax, eax ; 4+4=8, iff i8count != 0 @@: mov dword[edx + 12], 0 ; reserved mov dword[edx + 16], 0 ; mov dword[edx + 20], 0 ; mov dword[edx + 24], 0 ; mov dword[edx + 28], 0 ; add edx, 32 lea esi, [ebx + xfs_inode.di_u + xfs_dir2_sf_hdr.parent + eax] dec ecx js .shortdir.fill ; skip some entries if the first entry to read is not 0 .shortdir.skip: test ecx, ecx jz .shortdir.skipped movzx edi, byte[esi + xfs_dir2_sf_entry.namelen] lea esi, [esi + xfs_dir2_sf_entry.name + edi] add esi, eax dec ecx jnz .shortdir.skip mov ecx, [esp + 28] ; entries to read jmp .shortdir.skipped .shortdir.fill: mov ecx, [esp + 28] ; total number test ecx, ecx jz .quit push ecx ;DEBUGF 1,"ecx: %d\n",ecx lea edi, [edx + 40] ; get file name offset ;DEBUGF 1,"filename: ..\n" mov dword[edi], '..' mov edi, edx push eax ebx edx esi stdcall xfs_get_inode_number_sf, dword[ebx + xfs_inode.di_u + xfs_dir2_sf_hdr.count], dword[ebx + xfs_inode.di_u + xfs_dir2_sf_hdr.parent + 4], dword[ebx + xfs_inode.di_u + xfs_dir2_sf_hdr.parent] stdcall xfs_read_inode, eax, edx, [ebp + XFS.tmp_inode] ; test eax, eax ; jnz .error stdcall xfs_get_inode_info, edx, edi test eax, eax pop esi edx ebx eax jnz .error mov ecx, [esp + 44] ; file name encding mov [edx + 4], ecx add edx, 304 ; ASCII only for now pop ecx dec ecx jz .quit ; push ecx ; lea edi, [edx + 40] ;DEBUGF 1,"filename: .\n" ; mov dword[edi], '.' ; mov edi, edx ; push eax edx ; stdcall xfs_get_inode_info, [ebp + XFS.cur_inode], edi ; test eax, eax ; pop edx eax ; jnz .error ; mov ecx, [esp + 44] ; mov [edx + 4], ecx ; add edx, 304 ; ASCII only for now ; pop ecx ; dec ecx ; jz .quit ; we skipped some entries ; now we fill min(required, present) number of bdfe's .shortdir.skipped: ;DEBUGF 1,"ecx: %d\n",ecx push ecx movzx ecx, byte[esi + xfs_dir2_sf_entry.namelen] add esi, xfs_dir2_sf_entry.name lea edi, [edx + 40] ; bdfe offset of file name ;DEBUGF 1,"filename: |%s|\n",esi rep movsb mov word[edi], 0 ; terminator (ASCIIZ) push eax ebx ecx edx esi ; push edx ; for xfs_get_inode_info mov edi, edx stdcall xfs_get_inode_number_sf, dword[ebx + xfs_inode.di_u + xfs_dir2_sf_hdr.count], [esi + 4], [esi] stdcall xfs_read_inode, eax, edx, [ebp + XFS.tmp_inode] ; test eax, eax ; jnz .error stdcall xfs_get_inode_info, edx, edi test eax, eax pop esi edx ecx ebx eax jnz .error mov ecx, [esp + 44] ; file name encoding mov [edx + 4], ecx add edx, 304 ; ASCII only for now add esi, eax pop ecx dec ecx jnz .shortdir.skipped jmp .quit .blockdir: ;DEBUGF 1,"blockdir\n" push edx lea eax, [ebx + xfs_inode.di_u + xfs_bmbt_rec.l0] stdcall xfs_extent_unpack, eax ;DEBUGF 1,"extent.br_startoff : 0x%x%x\n",[ebp+XFS.extent.br_startoff+4],[ebp+XFS.extent.br_startoff+0] ;DEBUGF 1,"extent.br_startblock: 0x%x%x\n",[ebp+XFS.extent.br_startblock+4],[ebp+XFS.extent.br_startblock+0] ;DEBUGF 1,"extent.br_blockcount: %d\n",[ebp+XFS.extent.br_blockcount] ;DEBUGF 1,"extent.br_state : %d\n",[ebp+XFS.extent.br_state] stdcall xfs_read_dirblock, dword[ebp + XFS.extent.br_startblock + 0], dword[ebp + XFS.extent.br_startblock + 4], [ebp + XFS.cur_dirblock] test eax, eax pop edx jnz .error ;DEBUGF 1,"dirblock signature: %s\n",[ebp+XFS.cur_dirblock] mov ebx, [ebp + XFS.cur_dirblock] mov dword[edx + 0], 1 ; version mov eax, [ebp + XFS.dirblocksize] mov ecx, [ebx + eax - sizeof.xfs_dir2_block_tail + xfs_dir2_block_tail.stale] mov eax, [ebx + eax - sizeof.xfs_dir2_block_tail + xfs_dir2_block_tail.count] bswap ecx bswap eax sub eax, ecx ; actual number of entries = count - stale mov [edx + 8], eax ; total entries ;DEBUGF 1,"total entries: %d\n",eax sub eax, [esp + 24] ; start number cmp eax, [esp + 28] ; entries to read jbe @f mov eax, [esp + 28] @@: mov [esp + 28], eax mov [edx + 4], eax ; number of actually read entries mov [ebp + XFS.entries_read], eax ;DEBUGF 1,"actually read entries: %d\n",eax mov dword[edx + 12], 0 ; reserved mov dword[edx + 16], 0 ; mov dword[edx + 20], 0 ; mov dword[edx + 24], 0 ; mov dword[edx + 28], 0 ; add ebx, xfs_dir2_block.u mov ecx, [esp + 24] ; start entry number ; also means how many to skip test ecx, ecx jz .blockdir.skipped .blockdir.skip: cmp word[ebx + xfs_dir2_data_union.unused.freetag], XFS_DIR2_DATA_FREE_TAG jne @f movzx eax, word[ebx + xfs_dir2_data_union.unused.length] xchg al, ah add ebx, eax jmp .blockdir.skip @@: movzx eax, [ebx + xfs_dir2_data_union.xentry.namelen] lea ebx, [ebx + xfs_dir2_data_union.xentry.name + eax + 2] ; 2 bytes for 'tag' add ebx, 7 ; align on 8 bytes and ebx, not 7 dec ecx jnz .blockdir.skip .blockdir.skipped: mov ecx, [edx + 4] ; actually read entries test ecx, ecx jz .quit add edx, 32 ; set edx to the first bdfe .blockdir.next_entry: cmp word[ebx + xfs_dir2_data_union.unused.freetag], XFS_NULL jne @f movzx eax, word[ebx + xfs_dir2_data_union.unused.length] xchg al, ah add ebx, eax jmp .blockdir.next_entry @@: push ecx push eax ebx ecx edx esi mov edi, edx mov edx, dword[ebx + xfs_dir2_data_union.xentry.inumber + 0] mov eax, dword[ebx + xfs_dir2_data_union.xentry.inumber + 4] bswap edx bswap eax stdcall xfs_read_inode, eax, edx, [ebp + XFS.tmp_inode] stdcall xfs_get_inode_info, edx, edi test eax, eax pop esi edx ecx ebx eax jnz .error mov ecx, [esp + 44] mov [edx + 4], ecx lea edi, [edx + 40] movzx ecx, byte[ebx + xfs_dir2_data_union.xentry.namelen] lea esi, [ebx + xfs_dir2_data_union.xentry.name] ;DEBUGF 1,"filename: |%s|\n",esi rep movsb ; call utf8_to_cp866 mov word[edi], 0 ; terminator lea ebx, [esi + 2] ; skip 'tag' add ebx, 7 ; xfs_dir2_data_entries are aligned to 8 bytes and ebx, not 7 add edx, 304 pop ecx dec ecx jnz .blockdir.next_entry jmp .quit .leafdir: ;DEBUGF 1,"readdir: leaf\n" mov [ebp + XFS.cur_inode_save], ebx push ebx ecx edx lea eax, [ebx + xfs_inode.di_u + xfs_bmbt_rec.l0] mov edx, [ebx + xfs_inode.di_core.di_nextents] bswap edx stdcall xfs_extent_list_read_dirblock, eax, [ebp + XFS.dir2_leaf_offset_blocks], 0, edx, 0xffffffff, 0xffffffff mov ecx, eax and ecx, edx inc ecx pop edx ecx ebx jz .error mov eax, [ebp + XFS.cur_dirblock] movzx ecx, word[eax + xfs_dir2_leaf.hdr.stale] movzx eax, word[eax + xfs_dir2_leaf.hdr.count] xchg cl, ch xchg al, ah sub eax, ecx ;DEBUGF 1,"total count: %d\n",eax mov dword[edx + 0], 1 ; version mov [edx + 8], eax ; total entries sub eax, [esp + 24] ; start number cmp eax, [esp + 28] ; entries to read jbe @f mov eax, [esp + 28] @@: mov [esp + 28], eax mov [edx + 4], eax ; number of actually read entries mov dword[edx + 12], 0 ; reserved mov dword[edx + 16], 0 ; mov dword[edx + 20], 0 ; mov dword[edx + 24], 0 ; mov dword[edx + 28], 0 ; mov eax, [ebp + XFS.cur_dirblock] add eax, [ebp + XFS.dirblocksize] mov [ebp + XFS.max_dirblockaddr], eax mov dword[ebp + XFS.next_block_num + 0], 0 mov dword[ebp + XFS.next_block_num + 4], 0 mov ebx, [ebp + XFS.max_dirblockaddr] ; to read dirblock immediately mov ecx, [esp + 24] ; start number test ecx, ecx jz .leafdir.skipped .leafdir.skip: cmp ebx, [ebp + XFS.max_dirblockaddr] jne @f push ecx edx mov ebx, [ebp + XFS.cur_inode_save] lea eax, [ebx + xfs_inode.di_u + xfs_bmbt_rec.l0] mov edx, [ebx + xfs_inode.di_core.di_nextents] bswap edx stdcall xfs_extent_list_read_dirblock, eax, dword[ebp + XFS.next_block_num + 0], dword[ebp + XFS.next_block_num + 4], edx, [ebp + XFS.dir2_leaf_offset_blocks], 0 mov ecx, eax and ecx, edx inc ecx jz .error add eax, 1 adc edx, 0 mov dword[ebp + XFS.next_block_num + 0], eax mov dword[ebp + XFS.next_block_num + 4], edx mov ebx, [ebp + XFS.cur_dirblock] add ebx, sizeof.xfs_dir2_data_hdr pop edx ecx @@: cmp word[ebx + xfs_dir2_data_union.unused.freetag], XFS_DIR2_DATA_FREE_TAG jne @f movzx eax, word[ebx + xfs_dir2_data_union.unused.length] xchg al, ah add ebx, eax jmp .leafdir.skip @@: movzx eax, [ebx + xfs_dir2_data_union.xentry.namelen] lea ebx, [ebx + xfs_dir2_data_union.xentry.name + eax + 2] ; 2 for 'tag' add ebx, 7 and ebx, not 7 dec ecx jnz .leafdir.skip .leafdir.skipped: mov [ebp + XFS.entries_read], 0 mov ecx, [edx + 4] ; actually read entries test ecx, ecx jz .quit add edx, 32 ; first bdfe entry .leafdir.next_entry: ;DEBUGF 1,"next_extry\n" cmp ebx, [ebp + XFS.max_dirblockaddr] jne .leafdir.process_current_block push ecx edx mov ebx, [ebp + XFS.cur_inode_save] lea eax, [ebx + xfs_inode.di_u + xfs_bmbt_rec.l0] mov edx, [ebx + xfs_inode.di_core.di_nextents] bswap edx stdcall xfs_extent_list_read_dirblock, eax, dword[ebp + XFS.next_block_num + 0], dword[ebp + XFS.next_block_num + 4], edx, [ebp + XFS.dir2_leaf_offset_blocks], 0 ;DEBUGF 1,"RETVALUE: %d %d\n",edx,eax mov ecx, eax and ecx, edx inc ecx jnz @f pop edx ecx jmp .quit @@: add eax, 1 adc edx, 0 mov dword[ebp + XFS.next_block_num + 0], eax mov dword[ebp + XFS.next_block_num + 4], edx mov ebx, [ebp + XFS.cur_dirblock] add ebx, sizeof.xfs_dir2_data_hdr pop edx ecx .leafdir.process_current_block: cmp word[ebx + xfs_dir2_data_union.unused.freetag], XFS_DIR2_DATA_FREE_TAG jne @f movzx eax, word[ebx + xfs_dir2_data_union.unused.length] xchg al, ah add ebx, eax jmp .leafdir.next_entry @@: push eax ebx ecx edx esi mov edi, edx mov edx, dword[ebx + xfs_dir2_data_union.xentry.inumber + 0] mov eax, dword[ebx + xfs_dir2_data_union.xentry.inumber + 4] bswap edx bswap eax stdcall xfs_read_inode, eax, edx, [ebp + XFS.tmp_inode] stdcall xfs_get_inode_info, edx, edi test eax, eax pop esi edx ecx ebx eax jnz .error push ecx mov ecx, [esp + 44] mov [edx + 4], ecx lea edi, [edx + 40] movzx ecx, byte[ebx + xfs_dir2_data_union.xentry.namelen] lea esi, [ebx + xfs_dir2_data_union.xentry.name] ;DEBUGF 1,"filename: |%s|\n",esi rep movsb pop ecx mov word[edi], 0 lea ebx, [esi + 2] ; skip 'tag' add ebx, 7 ; xfs_dir2_data_entries are aligned to 8 bytes and ebx, not 7 add edx, 304 ; ASCII only for now inc [ebp + XFS.entries_read] dec ecx jnz .leafdir.next_entry jmp .quit .nodedir: ;DEBUGF 1,"readdir: node\n" push edx mov [ebp + XFS.cur_inode_save], ebx mov [ebp + XFS.entries_read], 0 lea eax, [ebx + xfs_inode.di_u + xfs_bmbt_rec.l0] mov edx, [ebx + xfs_inode.di_core.di_nextents] bswap edx stdcall xfs_dir2_node_get_numfiles, eax, edx, [ebp + XFS.dir2_leaf_offset_blocks] pop edx test eax, eax jnz .error mov eax, [ebp + XFS.entries_read] mov [ebp + XFS.entries_read], 0 ;DEBUGF 1,"numfiles: %d\n",eax mov dword[edx + 0], 1 ; version mov [edx + 8], eax ; total entries sub eax, [esp + 24] ; start number cmp eax, [esp + 28] ; entries to read jbe @f mov eax, [esp + 28] @@: mov [esp + 28], eax mov [edx + 4], eax ; number of actually read entries mov dword[edx + 12], 0 ; reserved mov dword[edx + 16], 0 ; mov dword[edx + 20], 0 ; mov dword[edx + 24], 0 ; mov dword[edx + 28], 0 ; mov eax, [ebp + XFS.cur_dirblock] add eax, [ebp + XFS.dirblocksize] mov [ebp + XFS.max_dirblockaddr], eax mov dword[ebp + XFS.next_block_num + 0], 0 mov dword[ebp + XFS.next_block_num + 4], 0 mov ebx, [ebp + XFS.max_dirblockaddr] ; to read dirblock immediately mov ecx, [esp + 24] ; start number test ecx, ecx jz .leafdir.skipped jmp .leafdir.skip .btreedir: ;DEBUGF 1,"readdir: btree\n" mov [ebp + XFS.cur_inode_save], ebx push ebx edx mov eax, [ebx + xfs_inode.di_core.di_nextents] bswap eax mov [ebp + XFS.ro_nextents], eax mov eax, [ebp + XFS.inodesize] sub eax, xfs_inode.di_u sub eax, sizeof.xfs_bmdr_block shr eax, 4 ;DEBUGF 1,"maxnumresc: %d\n",eax mov edx, dword[ebx + xfs_inode.di_u + sizeof.xfs_bmdr_block + sizeof.xfs_bmbt_key*eax + 0] mov eax, dword[ebx + xfs_inode.di_u + sizeof.xfs_bmdr_block + sizeof.xfs_bmbt_key*eax + 4] bswap eax bswap edx mov ebx, [ebp + XFS.cur_block] ;DEBUGF 1,"read_block: %x %x ",edx,eax stdcall xfs_read_block pop edx ebx test eax, eax jnz .error ;DEBUGF 1,"ok\n" mov ebx, [ebp + XFS.cur_block] push edx mov [ebp + XFS.entries_read], 0 lea eax, [ebx + sizeof.xfs_bmbt_block] mov edx, [ebp + XFS.ro_nextents] stdcall xfs_dir2_node_get_numfiles, eax, edx, [ebp + XFS.dir2_leaf_offset_blocks] pop edx test eax, eax jnz .error mov eax, [ebp + XFS.entries_read] mov [ebp + XFS.entries_read], 0 ;DEBUGF 1,"numfiles: %d\n",eax mov dword[edx + 0], 1 ; version mov [edx + 8], eax ; total entries sub eax, [esp + 24] ; start number cmp eax, [esp + 28] ; entries to read jbe @f mov eax, [esp + 28] @@: mov [esp + 28], eax mov [edx + 4], eax ; number of actually read entries mov dword[edx + 12], 0 mov dword[edx + 16], 0 mov dword[edx + 20], 0 mov dword[edx + 24], 0 mov dword[edx + 28], 0 mov eax, [ebp + XFS.cur_dirblock] ; fsblock? add eax, [ebp + XFS.dirblocksize] mov [ebp + XFS.max_dirblockaddr], eax mov dword[ebp + XFS.next_block_num + 0], 0 mov dword[ebp + XFS.next_block_num + 4], 0 mov ebx, [ebp + XFS.max_dirblockaddr] ; to read dirblock immediately mov ecx, [esp + 24] ; start number test ecx, ecx jz .btreedir.skipped ; jmp .btreedir.skip .btreedir.skip: cmp ebx, [ebp + XFS.max_dirblockaddr] jne @f push ecx edx mov ebx, [ebp + XFS.cur_block] lea eax, [ebx + sizeof.xfs_bmbt_block] mov edx, [ebp + XFS.ro_nextents] stdcall xfs_extent_list_read_dirblock, eax, dword[ebp + XFS.next_block_num + 0], dword[ebp + XFS.next_block_num + 4], edx, [ebp + XFS.dir2_leaf_offset_blocks], 0 ;DEBUGF 1,"RETVALUE: %d %d\n",edx,eax mov ecx, eax and ecx, edx inc ecx jz .error add eax, 1 adc edx, 0 mov dword[ebp + XFS.next_block_num + 0], eax mov dword[ebp + XFS.next_block_num + 4], edx mov ebx, [ebp + XFS.cur_dirblock] add ebx, sizeof.xfs_dir2_data_hdr pop edx ecx @@: cmp word[ebx + xfs_dir2_data_union.unused.freetag], XFS_DIR2_DATA_FREE_TAG jne @f movzx eax, word[ebx + xfs_dir2_data_union.unused.length] xchg al, ah add ebx, eax jmp .btreedir.skip @@: movzx eax, [ebx + xfs_dir2_data_union.xentry.namelen] lea ebx, [ebx + xfs_dir2_data_union.xentry.name + eax + 2] ; 2 for 'tag' add ebx, 7 and ebx, not 7 dec ecx jnz .btreedir.skip .btreedir.skipped: mov [ebp + XFS.entries_read], 0 mov ecx, [edx + 4] ; actually read entries test ecx, ecx jz .quit add edx, 32 .btreedir.next_entry: ;mov eax, [ebp + XFS.entries_read] ;DEBUGF 1,"next_extry: %d\n",eax cmp ebx, [ebp + XFS.max_dirblockaddr] jne .btreedir.process_current_block push ecx edx mov ebx, [ebp + XFS.cur_block] lea eax, [ebx + sizeof.xfs_bmbt_block] mov edx, [ebp + XFS.ro_nextents] stdcall xfs_extent_list_read_dirblock, eax, dword[ebp + XFS.next_block_num + 0], dword[ebp + XFS.next_block_num + 4], edx, [ebp + XFS.dir2_leaf_offset_blocks], 0 ;DEBUGF 1,"RETVALUE: %d %d\n",edx,eax mov ecx, eax and ecx, edx inc ecx jnz @f pop edx ecx jmp .quit @@: add eax, 1 adc edx, 0 mov dword[ebp + XFS.next_block_num + 0], eax mov dword[ebp + XFS.next_block_num + 4], edx mov ebx, [ebp + XFS.cur_dirblock] add ebx, sizeof.xfs_dir2_data_hdr pop edx ecx .btreedir.process_current_block: cmp word[ebx + xfs_dir2_data_union.unused.freetag], XFS_DIR2_DATA_FREE_TAG jne @f movzx eax, word[ebx + xfs_dir2_data_union.unused.length] xchg al, ah add ebx, eax jmp .btreedir.next_entry @@: push eax ebx ecx edx esi mov edi, edx mov edx, dword[ebx + xfs_dir2_data_union.xentry.inumber + 0] mov eax, dword[ebx + xfs_dir2_data_union.xentry.inumber + 4] bswap edx bswap eax stdcall xfs_read_inode, eax, edx, [ebp + XFS.tmp_inode] stdcall xfs_get_inode_info, edx, edi test eax, eax pop esi edx ecx ebx eax jnz .error push ecx mov ecx, [esp + 44] mov [edx + 4], ecx lea edi, [edx + 40] movzx ecx, byte[ebx + xfs_dir2_data_union.xentry.namelen] lea esi, [ebx + xfs_dir2_data_union.xentry.name] ;DEBUGF 1,"filename: |%s|\n",esi rep movsb pop ecx mov word[edi], 0 lea ebx, [esi + 2] ; skip 'tag' add ebx, 7 ; xfs_dir2_data_entries are aligned to 8 bytes and ebx, not 7 add edx, 304 inc [ebp + XFS.entries_read] dec ecx jnz .btreedir.next_entry jmp .quit .quit: pop edi esi edx ecx add esp, 4 ; pop vars xor eax, eax ; mov ebx, [esp + 8] mov ebx, [ebp + XFS.entries_read] DEBUGF 1,"xfs_dir_get_bdfes done: %d\n",ebx ret 20 .error: pop edi esi edx ecx add esp, 4 ; pop vars mov eax, ERROR_FS_FAIL movi ebx, -1 ret 20 ;---------------------------------------------------------------- ; push inode_hi ; push inode_lo ; push name ;---------------------------------------------------------------- xfs_get_inode_short: ; this function searches for the file in _current_ dir ; it is called recursively for all the subdirs /path/to/my/file ;DEBUGF 1,"xfs_get_inode_short: %s\n",[esp+4] mov esi, [esp + 4] ; name movzx eax, word[esi] cmp eax, '.' ; current dir; it is already read, just return je .quit cmp eax, './' ; same thing je .quit ; read inode mov eax, [esp + 8] ; inode_lo mov edx, [esp + 12] ; inode_hi stdcall xfs_read_inode, eax, edx, [ebp + XFS.cur_inode] test eax, eax movi eax, ERROR_FS_FAIL jnz .error ; find file name in directory ; switch directory ondisk format mov ebx, edx mov [ebp + XFS.cur_inode_save], ebx cmp byte[ebx + xfs_inode.di_core.di_format], XFS_DINODE_FMT_LOCAL jne .not_shortdir ;DEBUGF 1,"dir: shortdir\n" jmp .shortdir .not_shortdir: cmp byte[ebx + xfs_inode.di_core.di_format], XFS_DINODE_FMT_EXTENTS jne .not_blockdir mov eax, [ebx + xfs_inode.di_core.di_nextents] bswap eax cmp eax, 1 jne .not_blockdir jmp .blockdir .not_blockdir: cmp byte[ebx + xfs_inode.di_core.di_format], XFS_DINODE_FMT_EXTENTS jne .not_leafdir mov eax, [ebx + xfs_inode.di_core.di_nextents] bswap eax cmp eax, 4 ja .not_leafdir jmp .leafdir .not_leafdir: cmp byte[ebx + xfs_inode.di_core.di_format], XFS_DINODE_FMT_EXTENTS jne .not_nodedir jmp .nodedir .not_nodedir: cmp byte[ebx + xfs_inode.di_core.di_format], XFS_DINODE_FMT_BTREE jne .not_btreedir jmp .btreedir .not_btreedir: DEBUGF 1,"NOT IMPLEMENTED: DIR FORMAT\n" jmp .error .shortdir: .shortdir.check_parent: ; parent inode number in shortform directories is always implicit, check this case mov eax, [esi] and eax, 0x00ffffff cmp eax, '..' je .shortdir.parent2 cmp eax, '../' je .shortdir.parent3 jmp .shortdir.common .shortdir.parent3: inc esi .shortdir.parent2: add esi, 2 add ebx, xfs_inode.di_u stdcall xfs_get_inode_number_sf, dword[ebx + xfs_dir2_sf_hdr.count], dword[ebx + xfs_dir2_sf_hdr.parent + 4], dword[ebx + xfs_dir2_sf_hdr.parent] ;DEBUGF 1,"found inode: 0x%x%x\n",edx,eax jmp .quit ; not a parent inode? ; search in the list, all the other files are stored uniformly .shortdir.common: mov eax, 4 movzx edx, word[ebx + xfs_inode.di_u + xfs_dir2_sf_hdr.count] ; read count (byte) and i8count (byte) at once test dl, dl ; is count zero? jnz @f shr edx, 8 ; use i8count add eax, eax ; inode_num size @@: lea edi, [ebx + xfs_inode.di_u + xfs_dir2_sf_hdr.parent + eax] .next_name: movzx ecx, byte[edi + xfs_dir2_sf_entry.namelen] add edi, xfs_dir2_sf_entry.name mov esi, [esp + 4] ;DEBUGF 1,"esi: %s\n",esi ;DEBUGF 1,"edi: %s\n",edi repe cmpsb jne @f cmp byte[esi], 0 ; HINT: use adc here? je .found cmp byte[esi], '/' je .found_inc @@: add edi, ecx add edi, eax dec edx jnz .next_name movi eax, ERROR_FILE_NOT_FOUND jmp .error .found_inc: ; increment esi to skip '/' symbol ; this means esi always points to valid file name or zero terminator byte inc esi .found: stdcall xfs_get_inode_number_sf, dword[ebx + xfs_inode.di_u + xfs_dir2_sf_hdr.count], [edi + 4], [edi] ;DEBUGF 1,"found inode: 0x%x%x\n",edx,eax jmp .quit .blockdir: lea eax, [ebx + xfs_inode.di_u + xfs_bmbt_rec.l0] stdcall xfs_extent_unpack, eax stdcall xfs_read_dirblock, dword[ebp + XFS.extent.br_startblock + 0], dword[ebp + XFS.extent.br_startblock + 4], [ebp + XFS.cur_dirblock] test eax, eax jnz .error ;DEBUGF 1,"dirblock signature: %s\n",[ebp+XFS.cur_dirblock] mov ebx, [ebp + XFS.cur_dirblock] mov eax, [ebp + XFS.dirblocksize] mov eax, [ebx + eax - sizeof.xfs_dir2_block_tail + xfs_dir2_block_tail.count] ; note that we don't subtract xfs_dir2_block_tail.stale here, ; since we need the number of leaf entries rather than file number bswap eax add ebx, [ebp + XFS.dirblocksize] ; mov ecx, sizeof.xfs_dir2_leaf_entry imul ecx, eax, sizeof.xfs_dir2_leaf_entry sub ebx, sizeof.xfs_dir2_block_tail sub ebx, ecx shr ecx, 3 push ecx ; for xfs_get_inode_by_hash push ebx ; for xfs_get_inode_by_hash mov edi, esi xor eax, eax mov ecx, 4096 ; MAX_PATH_LEN repne scasb movi eax, ERROR_FS_FAIL jne .error neg ecx add ecx, 4096 ; MAX_PATH_LEN dec ecx mov edx, ecx ;DEBUGF 1,"strlen total : %d\n",edx mov edi, esi mov eax, '/' mov ecx, edx repne scasb jne @f inc ecx @@: neg ecx add ecx, edx ;DEBUGF 1,"strlen current: %d\n",ecx stdcall xfs_hashname, esi, ecx add esi, ecx cmp byte[esi], '/' jne @f inc esi @@: ;DEBUGF 1,"hashed: 0x%x\n",eax ; bswap eax stdcall xfs_get_addr_by_hash bswap eax ;DEBUGF 1,"got address: 0x%x\n",eax cmp eax, -1 jne @f movi eax, ERROR_FILE_NOT_FOUND mov ebx, -1 jmp .error @@: shl eax, 3 mov ebx, [ebp + XFS.cur_dirblock] add ebx, eax mov edx, [ebx + 0] mov eax, [ebx + 4] bswap edx bswap eax ;DEBUGF 1,"found inode: 0x%x%x\n",edx,eax jmp .quit .leafdir: ;DEBUGF 1,"dirblock signature: %s\n",[ebp+XFS.cur_dirblock] lea eax, [ebx + xfs_inode.di_u + xfs_bmbt_rec.l0] mov edx, [ebx + xfs_inode.di_core.di_nextents] bswap edx stdcall xfs_extent_list_read_dirblock, eax, [ebp + XFS.dir2_leaf_offset_blocks], 0, edx, -1, -1 ;DEBUGF 1,"RETVALUE: %d %d\n",edx,eax mov ecx, eax and ecx, edx inc ecx jz .error mov ebx, [ebp + XFS.cur_dirblock] movzx eax, [ebx + xfs_dir2_leaf.hdr.count] ; note that we don't subtract xfs_dir2_leaf.hdr.stale here, ; since we need the number of leaf entries rather than file number xchg al, ah add ebx, xfs_dir2_leaf.ents ; imul ecx, eax, sizeof.xfs_dir2_leaf_entry ; shr ecx, 3 push eax ; for xfs_get_addr_by_hash: len push ebx ; for xfs_get_addr_by_hash: base mov edi, esi xor eax, eax mov ecx, 4096 ; MAX_PATH_LEN repne scasb movi eax, ERROR_FS_FAIL jne .error neg ecx add ecx, 4096 dec ecx mov edx, ecx ;DEBUGF 1,"strlen total : %d\n",edx mov edi, esi mov eax, '/' mov ecx, edx repne scasb jne @f inc ecx @@: neg ecx add ecx, edx ;DEBUGF 1,"strlen current: %d\n",ecx stdcall xfs_hashname, esi, ecx add esi, ecx cmp byte[esi], '/' jne @f inc esi @@: ;DEBUGF 1,"hashed: 0x%x\n",eax stdcall xfs_get_addr_by_hash bswap eax ;DEBUGF 1,"got address: 0x%x\n",eax cmp eax, -1 jne @f movi eax, ERROR_FILE_NOT_FOUND mov ebx, -1 jmp .error @@: mov ebx, [ebp + XFS.cur_inode_save] push esi edi xor edi, edi mov esi, eax shld edi, esi, 3 ; get offset shl esi, 3 ; 2^3 = 8 byte align mov edx, esi mov ecx, [ebp + XFS.dirblklog] add ecx, [ebp + XFS.blocklog] mov eax, 1 shl eax, cl dec eax and edx, eax push edx shrd esi, edi, cl shr edi, cl lea eax, [ebx + xfs_inode.di_u + xfs_bmbt_rec.l0] mov edx, [ebx + xfs_inode.di_core.di_nextents] bswap edx stdcall xfs_extent_list_read_dirblock, eax, esi, edi, edx, [ebp + XFS.dir2_leaf_offset_blocks], 0 ;DEBUGF 1,"RETVALUE: %d %d\n",edx,eax pop edx pop edi esi mov ecx, eax and ecx, edx inc ecx jz .error mov ebx, [ebp + XFS.cur_dirblock] add ebx, edx mov edx, [ebx + 0] mov eax, [ebx + 4] bswap edx bswap eax ;DEBUGF 1,"found inode: 0x%x%x\n",edx,eax jmp .quit .nodedir: ;DEBUGF 1,"lookupdir: node\n" mov [ebp + XFS.cur_inode_save], ebx mov edi, esi xor eax, eax mov ecx, 4096 ; MAX_PATH_LEN repne scasb movi eax, ERROR_FS_FAIL jne .error neg ecx add ecx, 4096 ; MAX_PATH_LEN dec ecx mov edx, ecx ;DEBUGF 1,"strlen total : %d\n",edx mov edi, esi mov eax, '/' mov ecx, edx repne scasb jne @f inc ecx @@: neg ecx add ecx, edx ;DEBUGF 1,"strlen current: %d\n",ecx stdcall xfs_hashname, esi, ecx add esi, ecx cmp byte[esi], '/' jne @f inc esi @@: ;DEBUGF 1,"hashed: 0x%x\n",eax push edi edx mov edi, eax mov [ebp + XFS.entries_read], 0 lea eax, [ebx + xfs_inode.di_u + xfs_bmbt_rec.l0] mov edx, [ebx + xfs_inode.di_core.di_nextents] bswap edx stdcall xfs_dir2_lookupdir_node, eax, edx, [ebp + XFS.dir2_leaf_offset_blocks], edi pop edx edi test eax, eax jnz .error bswap ecx ;DEBUGF 1,"got address: 0x%x\n",ecx mov ebx, [ebp + XFS.cur_inode_save] push esi edi xor edi, edi mov esi, ecx shld edi, esi, 3 ; get offset shl esi, 3 ; 8 byte align mov edx, esi mov ecx, [ebp + XFS.dirblklog] add ecx, [ebp + XFS.blocklog] mov eax, 1 shl eax, cl dec eax and edx, eax push edx shrd esi, edi, cl shr edi, cl lea eax, [ebx + xfs_inode.di_u + xfs_bmbt_rec.l0] mov edx, [ebx + xfs_inode.di_core.di_nextents] bswap edx stdcall xfs_extent_list_read_dirblock, eax, esi, edi, edx, [ebp + XFS.dir2_leaf_offset_blocks], 0 ;DEBUGF 1,"RETVALUE: %d %d\n",edx,eax pop edx pop edi esi mov ecx, eax and ecx, edx inc ecx jz .error mov ebx, [ebp + XFS.cur_dirblock] add ebx, edx mov edx, [ebx + 0] mov eax, [ebx + 4] bswap edx bswap eax ;DEBUGF 1,"found inode: 0x%x%x\n",edx,eax jmp .quit .btreedir: DEBUGF 1,"lookupdir: btree\n" mov [ebp + XFS.cur_inode_save], ebx push ebx edx mov eax, [ebx + xfs_inode.di_core.di_nextents] bswap eax mov [ebp + XFS.ro_nextents], eax mov eax, [ebp + XFS.inodesize] sub eax, xfs_inode.di_u sub eax, sizeof.xfs_bmdr_block shr eax, 4 ; FIXME forkoff ;DEBUGF 1,"maxnumresc: %d\n",eax mov edx, dword[ebx + xfs_inode.di_u + sizeof.xfs_bmdr_block + sizeof.xfs_bmbt_key*eax + 0] mov eax, dword[ebx + xfs_inode.di_u + sizeof.xfs_bmdr_block + sizeof.xfs_bmbt_key*eax + 4] bswap eax bswap edx mov ebx, [ebp + XFS.cur_block] ;DEBUGF 1,"read_block: %x %x ",edx,eax stdcall xfs_read_block pop edx ebx test eax, eax jnz .error ;DEBUGF 1,"ok\n" mov ebx, [ebp + XFS.cur_block] mov edi, esi xor eax, eax mov ecx, 4096 ; MAX_PATH_LEN repne scasb movi eax, ERROR_FS_FAIL jne .error neg ecx add ecx, 4096 dec ecx mov edx, ecx DEBUGF 1,"strlen total : %d\n",edx mov edi, esi mov eax, '/' mov ecx, edx repne scasb jne @f inc ecx @@: neg ecx add ecx, edx DEBUGF 1,"strlen current: %d\n",ecx stdcall xfs_hashname, esi, ecx add esi, ecx cmp byte[esi], '/' jne @f inc esi @@: DEBUGF 1,"hashed: 0x%x\n",eax push edi edx mov edi, eax mov [ebp + XFS.entries_read], 0 lea eax, [ebx + sizeof.xfs_bmbt_block] mov edx, [ebp + XFS.ro_nextents] ;push eax ;mov eax, [ebp + XFS.dir2_leaf_offset_blocks] ;DEBUGF 1,": 0x%x %d\n",eax,eax ;pop eax stdcall xfs_dir2_lookupdir_node, eax, edx, [ebp + XFS.dir2_leaf_offset_blocks], edi pop edx edi test eax, eax jnz .error bswap ecx DEBUGF 1,"got address: 0x%x\n",ecx mov ebx, [ebp + XFS.cur_block] push esi edi xor edi, edi mov esi, ecx shld edi, esi, 3 ; get offset shl esi, 3 mov edx, esi mov ecx, [ebp + XFS.dirblklog] add ecx, [ebp + XFS.blocklog] mov eax, 1 shl eax, cl dec eax and edx, eax push edx shrd esi, edi, cl shr edi, cl lea eax, [ebx + sizeof.xfs_bmbt_block] mov edx, [ebp + XFS.ro_nextents] stdcall xfs_extent_list_read_dirblock, eax, esi, edi, edx, [ebp + XFS.dir2_leaf_offset_blocks], 0 ;DEBUGF 1,"RETVALUE: %d %d\n",edx,eax pop edx pop edi esi mov ecx, eax and ecx, edx inc ecx jz .error mov ebx, [ebp + XFS.cur_dirblock] add ebx, edx mov edx, [ebx + 0] mov eax, [ebx + 4] bswap edx bswap eax DEBUGF 1,"found inode: 0x%x%x\n",edx,eax jmp .quit .quit: ret 12 .error: xor eax, eax mov edx, eax ret 12 ;---------------------------------------------------------------- ; push name ; call xfs_get_inode ; test eax, eax ;---------------------------------------------------------------- xfs_get_inode: ; call xfs_get_inode_short until file is found / error returned ;DEBUGF 1,"getting inode of: %s\n",[esp+4] push ebx esi edi ; start from the root inode mov edx, dword[ebp + XFS.rootino + 4] ; hi mov eax, dword[ebp + XFS.rootino + 0] ; lo mov esi, [esp + 16] ; name .next_dir: cmp byte[esi], 0 je .found ;DEBUGF 1,"next_level: |%s|\n",esi stdcall xfs_get_inode_short, esi, eax, edx test edx, edx jnz @f test eax, eax jz .error @@: jmp .next_dir ; file name found, go to next directory level .found: .quit: pop edi esi ebx ret 4 .error: pop edi esi ebx xor eax, eax mov edx, eax ret 4 ;---------------------------------------------------------------- ; xfs_ReadFolder - XFS implementation of reading a folder ; in: ebp = pointer to XFS structure ; in: esi+[esp+4] = name ; in: ebx = pointer to parameters from sysfunc 70 ; out: eax, ebx = return values for sysfunc 70 ;---------------------------------------------------------------- xfs_ReadFolder: ; to read folder ; 1. lock partition ; 2. find inode number ; 3. read this inode ; 4. get bdfe's ; 5. unlock partition ; 1. call xfs_lock push ecx edx esi edi ; 2. push ebx esi edi add esi, [esp + 32] ; directory name ;DEBUGF 1,"xfs_ReadFolder: |%s|\n",esi stdcall xfs_get_inode, esi pop edi esi ebx mov ecx, edx or ecx, eax jnz @f movi eax, ERROR_FILE_NOT_FOUND @@: ; 3. stdcall xfs_read_inode, eax, edx, [ebp + XFS.cur_inode] test eax, eax movi eax, ERROR_FS_FAIL jnz .error ; 4. mov eax, [ebx + 8] ; encoding and eax, 1 stdcall xfs_dir_get_bdfes, [ebx + 4], [ebx + 12], [ebx + 16], edx, eax test eax, eax jnz .error .quit: ;DEBUGF 1,"\n\n" pop edi esi edx ecx ; 5. call xfs_unlock xor eax, eax ret .error: ;DEBUGF 1,"\n\n" pop edi esi edx ecx push eax call xfs_unlock pop eax ret ;---------------------------------------------------------------- ; push inode_num_hi ; push inode_num_lo ; push [count] ; call xfs_get_inode_number_sf ;---------------------------------------------------------------- xfs_get_inode_number_sf: ; inode numbers in short form directories may be 4 or 8 bytes long ; determine the length in run time and read inode number at given address cmp byte[esp + 4 + xfs_dir2_sf_hdr.i8count], 0 ; i8count == 0 means 4 byte per inode number je .i4bytes .i8bytes: mov edx, [esp + 12] ; hi mov eax, [esp + 8] ; lo bswap edx ; big endian bswap eax ret 12 .i4bytes: xor edx, edx ; no hi mov eax, [esp + 12] ; hi = lo bswap eax ; big endian ret 12 ;---------------------------------------------------------------- ; push dest ; push src ; call xfs_get_inode_info ;---------------------------------------------------------------- xfs_get_inode_info: ; get access time and other file properties ; useful for browsing directories ; called for each dir entry ;DEBUGF 1,"get_inode_info\n" xor eax, eax mov edx, [esp + 4] movzx ecx, word[edx + xfs_inode.di_core.di_mode] xchg cl, ch ;DEBUGF 1,"di_mode: %x\n",ecx test ecx, S_IFDIR ; directory? jz @f mov eax, 0x10 ; set directory flag @@: mov edi, [esp + 8] mov [edi + 0], eax mov eax, dword[edx + xfs_inode.di_core.di_size + 0] ; hi bswap eax mov dword[edi + 36], eax ; file size hi ;DEBUGF 1,"file_size hi: %d\n",eax mov eax, dword[edx + xfs_inode.di_core.di_size + 4] ; lo bswap eax mov dword[edi + 32], eax ; file size lo ;DEBUGF 1,"file_size lo: %d\n",eax add edi, 8 mov eax, [edx + xfs_inode.di_core.di_ctime.t_sec] bswap eax push edx xor edx, edx add eax, 3054539008 ;(369 * 365 + 89) * 24 * 3600 adc edx, 2 call ntfs_datetime_to_bdfe.sec pop edx mov eax, [edx + xfs_inode.di_core.di_atime.t_sec] bswap eax push edx xor edx, edx add eax, 3054539008 ;(369 * 365 + 89) * 24 * 3600 adc edx, 2 call ntfs_datetime_to_bdfe.sec pop edx mov eax, [edx + xfs_inode.di_core.di_mtime.t_sec] bswap eax push edx xor edx, edx add eax, 3054539008 ;(369 * 365 + 89) * 24 * 3600 adc edx, 2 call ntfs_datetime_to_bdfe.sec pop edx .quit: xor eax, eax ret 8 .error: movi eax, ERROR_FS_FAIL ret 8 ;---------------------------------------------------------------- ; push extent_data ; call xfs_extent_unpack ;---------------------------------------------------------------- xfs_extent_unpack: ; extents come as packet 128bit bitfields ; lets unpack them to access internal fields ; write result to the XFS.extent structure push eax ebx ecx edx mov ebx, [esp + 20] xor eax, eax mov edx, [ebx + 0] bswap edx test edx, 0x80000000 ; mask, see documentation setnz al mov [ebp + XFS.extent.br_state], eax and edx, 0x7fffffff ; mask mov eax, [ebx + 4] bswap eax shrd eax, edx, 9 shr edx, 9 mov dword[ebp + XFS.extent.br_startoff + 0], eax mov dword[ebp + XFS.extent.br_startoff + 4], edx mov edx, [ebx + 4] mov eax, [ebx + 8] mov ecx, [ebx + 12] bswap edx bswap eax bswap ecx and edx, 0x000001ff ; mask shrd ecx, eax, 21 shrd eax, edx, 21 mov dword[ebp + XFS.extent.br_startblock + 0], ecx mov dword[ebp + XFS.extent.br_startblock + 4], eax mov eax, [ebx + 12] bswap eax and eax, 0x001fffff ; mask mov [ebp + XFS.extent.br_blockcount], eax pop edx ecx ebx eax ;DEBUGF 1,"extent.br_startoff : %d %d\n",[ebp+XFS.extent.br_startoff+4],[ebp+XFS.extent.br_startoff+0] ;DEBUGF 1,"extent.br_startblock: %d %d\n",[ebp+XFS.extent.br_startblock+4],[ebp+XFS.extent.br_startblock+0] ;DEBUGF 1,"extent.br_blockcount: %d\n",[ebp+XFS.extent.br_blockcount] ;DEBUGF 1,"extent.br_state : %d\n",[ebp+XFS.extent.br_state] ret 4 ;---------------------------------------------------------------- ; push namelen ; push name ; call xfs_hashname ;---------------------------------------------------------------- xfs_hashname: ; xfs_da_hashname ; simple hash function ; never fails) push ecx esi xor eax, eax mov esi, [esp + 12] ; name mov ecx, [esp + 16] ; namelen ;mov esi, '.' ;mov ecx, 1 ;DEBUGF 1,"hashname: %d %s\n",ecx,esi @@: rol eax, 7 xor al, [esi] add esi, 1 loop @b pop esi ecx ret 8 ;---------------------------------------------------------------- ; push len ; push base ; eax -- hash value ; call xfs_get_addr_by_hash ;---------------------------------------------------------------- xfs_get_addr_by_hash: ; look for the directory entry offset by its file name hash ; allows fast file search for block, leaf and node directories ; binary (ternary) search ;DEBUGF 1,"get_addr_by_hash\n" push ebx esi mov ebx, [esp + 12] ; left mov edx, [esp + 16] ; len .next: mov ecx, edx ; jecxz .error test ecx, ecx jz .error shr ecx, 1 mov esi, [ebx + ecx*8 + xfs_dir2_leaf_entry.hashval] bswap esi ;DEBUGF 1,"cmp 0x%x",esi cmp eax, esi jb .below ja .above mov eax, [ebx + ecx*8 + xfs_dir2_leaf_entry.address] pop esi ebx ret 8 .below: ;DEBUGF 1,"b\n" mov edx, ecx jmp .next .above: ;DEBUGF 1,"a\n" lea ebx, [ebx + ecx*8 + 8] sub edx, ecx dec edx jmp .next .error: mov eax, -1 pop esi ebx ret 8 ;---------------------------------------------------------------- ; xfs_GetFileInfo - XFS implementation of getting file info ; in: ebp = pointer to XFS structure ; in: esi+[esp+4] = name ; in: ebx = pointer to parameters from sysfunc 70 ; out: eax, ebx = return values for sysfunc 70 ;---------------------------------------------------------------- xfs_GetFileInfo: ; lock partition ; get inode number by file name ; read inode ; get info ; unlock partition push ecx edx esi edi call xfs_lock add esi, [esp + 20] ; name ;DEBUGF 1,"xfs_GetFileInfo: |%s|\n",esi stdcall xfs_get_inode, esi mov ecx, edx or ecx, eax jnz @f movi eax, ERROR_FILE_NOT_FOUND jmp .error @@: stdcall xfs_read_inode, eax, edx, [ebp + XFS.cur_inode] test eax, eax movi eax, ERROR_FS_FAIL jnz .error stdcall xfs_get_inode_info, edx, [ebx + 16] .quit: call xfs_unlock pop edi esi edx ecx xor eax, eax ;DEBUGF 1,"quit\n\n" ret .error: call xfs_unlock pop edi esi edx ecx ;DEBUGF 1,"error\n\n" ret ;---------------------------------------------------------------- ; xfs_Read - XFS implementation of reading a file ; in: ebp = pointer to XFS structure ; in: esi+[esp+4] = name ; in: ebx = pointer to parameters from sysfunc 70 ; out: eax, ebx = return values for sysfunc 70 ;---------------------------------------------------------------- xfs_Read: push ebx ecx edx esi edi call xfs_lock add esi, [esp + 24] ;DEBUGF 1,"xfs_Read: %d %d |%s|\n",[ebx+4],[ebx+12],esi stdcall xfs_get_inode, esi mov ecx, edx or ecx, eax jnz @f movi eax, ERROR_FILE_NOT_FOUND jmp .error @@: stdcall xfs_read_inode, eax, edx, [ebp + XFS.cur_inode] test eax, eax movi eax, ERROR_FS_FAIL jnz .error mov [ebp + XFS.cur_inode_save], edx cmp byte[edx + xfs_inode.di_core.di_format], XFS_DINODE_FMT_EXTENTS jne .not_extent_list jmp .extent_list .not_extent_list: cmp byte[edx + xfs_inode.di_core.di_format], XFS_DINODE_FMT_BTREE jne .not_btree jmp .btree .not_btree: DEBUGF 1,"XFS: NOT IMPLEMENTED: FILE FORMAT\n" movi eax, ERROR_FS_FAIL jmp .error .extent_list: mov ecx, [ebx + 12] ; bytes to read mov edi, [ebx + 16] ; buffer for data mov esi, [ebx + 8] ; offset_hi mov ebx, [ebx + 4] ; offset_lo mov eax, dword[edx + xfs_inode.di_core.di_size + 4] ; lo bswap eax mov dword[ebp + XFS.bytes_left_in_file + 0], eax ; lo mov eax, dword[edx + xfs_inode.di_core.di_size + 0] ; hi bswap eax mov dword[ebp + XFS.bytes_left_in_file + 4], eax ; hi mov eax, [edx + xfs_inode.di_core.di_nextents] bswap eax mov [ebp + XFS.left_extents], eax mov dword[ebp + XFS.bytes_read], 0 ; actually read bytes xor eax, eax ; extent offset in list .extent_list.next_extent: ;DEBUGF 1,"extent_list.next_extent, eax: 0x%x\n",eax ;DEBUGF 1,"bytes_to_read: %d\n",ecx ;DEBUGF 1,"cur file offset: %d %d\n",esi,ebx ;DEBUGF 1,"esp: 0x%x\n",esp cmp [ebp + XFS.left_extents], 0 jne @f test ecx, ecx jz .quit movi eax, ERROR_END_OF_FILE jmp .error @@: push eax lea eax, [edx + xfs_inode.di_u + eax + xfs_bmbt_rec.l0] stdcall xfs_extent_unpack, eax pop eax dec [ebp + XFS.left_extents] add eax, sizeof.xfs_bmbt_rec push eax ebx ecx edx esi mov ecx, [ebp + XFS.blocklog] shrd ebx, esi, cl shr esi, cl cmp esi, dword[ebp + XFS.extent.br_startoff + 4] jb .extent_list.to_hole ; handle sparse files ja @f cmp ebx, dword[ebp + XFS.extent.br_startoff + 0] jb .extent_list.to_hole ; handle sparse files je .extent_list.to_extent ; read from the start of current extent @@: xor edx, edx mov eax, [ebp + XFS.extent.br_blockcount] add eax, dword[ebp + XFS.extent.br_startoff + 0] adc edx, dword[ebp + XFS.extent.br_startoff + 4] ;DEBUGF 1,"br_startoff: %d %d\n",edx,eax cmp esi, edx ja .extent_list.skip_extent jb .extent_list.to_extent cmp ebx, eax jae .extent_list.skip_extent jmp .extent_list.to_extent .extent_list.to_hole: ;DEBUGF 1,"extent_list.to_hole\n" pop esi edx ecx ebx eax jmp .extent_list.read_hole .extent_list.to_extent: ;DEBUGF 1,"extent_list.to_extent\n" pop esi edx ecx ebx eax jmp .extent_list.read_extent .extent_list.skip_extent: ;DEBUGF 1,"extent_list.skip_extent\n" pop esi edx ecx ebx eax jmp .extent_list.next_extent .extent_list.read_hole: ;DEBUGF 1,"hole: offt: 0x%x%x ",esi,ebx push eax edx mov eax, dword[ebp + XFS.extent.br_startoff + 0] mov edx, dword[ebp + XFS.extent.br_startoff + 4] push esi ebx mov ebx, ecx sub eax, ebx ; get hole_size, it is 64 bit sbb edx, 0 ; now edx:eax contains the size of hole ;DEBUGF 1,"size: 0x%x%x\n",edx,eax jnz @f ; if hole size >= 2^32, write bytes_to_read zero bytes cmp eax, ecx ; if hole size >= bytes_to_read, write bytes_to_read zeros jae @f mov ecx, eax ; if hole is < than bytes_to_read, write hole size zeros @@: sub ebx, ecx ; bytes_to_read - hole_size = left_to_read add dword[esp + 0], ecx ; update pushed file offset adc dword[esp + 4], 0 xor eax, eax ; hole is made of zeros rep stosb mov ecx, ebx pop ebx esi test ecx, ecx ; all requested bytes are read? pop edx eax jz .quit jmp .extent_list.read_extent ; continue from the start of unpacked extent .extent_list.read_extent: ;DEBUGF 1,"extent_list.read_extent\n" push eax ebx ecx edx esi mov eax, ebx mov edx, esi mov ecx, [ebp + XFS.blocklog] shrd eax, edx, cl shr edx, cl sub eax, dword[ebp + XFS.extent.br_startoff + 0] ; skip esi:ebx ? sbb edx, dword[ebp + XFS.extent.br_startoff + 4] sub [ebp + XFS.extent.br_blockcount], eax add dword[ebp + XFS.extent.br_startblock + 0], eax adc dword[ebp + XFS.extent.br_startblock + 4], 0 .extent_list.read_extent.next_block: ;DEBUGF 1,"extent_list.read_extent.next_block\n" cmp [ebp + XFS.extent.br_blockcount], 0 ; out of blocks in current extent? jne @f pop esi edx ecx ebx eax jmp .extent_list.next_extent ; go to next extent @@: mov eax, dword[ebp + XFS.extent.br_startblock + 0] mov edx, dword[ebp + XFS.extent.br_startblock + 4] push ebx mov ebx, [ebp + XFS.cur_block] ;DEBUGF 1,"read block: 0x%x%x\n",edx,eax stdcall xfs_read_block test eax, eax pop ebx jz @f pop esi edx ecx ebx eax movi eax, ERROR_FS_FAIL jmp .error @@: dec [ebp + XFS.extent.br_blockcount] add dword[ebp + XFS.extent.br_startblock + 0], 1 adc dword[ebp + XFS.extent.br_startblock + 4], 0 mov esi, [ebp + XFS.cur_block] mov ecx, [ebp + XFS.blocklog] mov eax, 1 shl eax, cl dec eax ; get blocklog mask and eax, ebx ; offset in current block add esi, eax neg eax add eax, [ebp + XFS.blocksize] mov ecx, [esp + 8] ; pushed ecx, bytes_to_read cmp ecx, eax ; is current block enough? jbe @f ; if so, read bytes_to_read bytes mov ecx, eax ; otherwise read the block up to the end @@: sub [esp + 8], ecx ; left_to_read add [esp + 12], ecx ; update current file offset, pushed ebx sub dword[ebp + XFS.bytes_left_in_file + 0], ecx sbb dword[ebp + XFS.bytes_left_in_file + 4], 0 jnc @f add dword[ebp + XFS.bytes_left_in_file + 0], ecx mov ecx, dword[ebp + XFS.bytes_left_in_file + 0] mov dword[ebp + XFS.bytes_left_in_file + 0], 0 mov dword[ebp + XFS.bytes_left_in_file + 4], 0 @@: add [ebp + XFS.bytes_read], ecx adc [esp + 0], dword 0 ; pushed esi ;DEBUGF 1,"read data: %d\n",ecx rep movsb mov ecx, [esp + 8] ;DEBUGF 1,"left_to_read: %d\n",ecx xor ebx, ebx test ecx, ecx jz @f cmp dword[ebp + XFS.bytes_left_in_file + 4], 0 jne .extent_list.read_extent.next_block cmp dword[ebp + XFS.bytes_left_in_file + 0], 0 jne .extent_list.read_extent.next_block @@: pop esi edx ecx ebx eax jmp .quit .btree: mov ecx, [ebx + 12] ; bytes to read mov [ebp + XFS.bytes_to_read], ecx mov edi, [ebx + 16] ; buffer for data mov esi, [ebx + 8] ; offset_hi mov ebx, [ebx + 4] ; offset_lo mov dword[ebp + XFS.file_offset + 0], ebx mov dword[ebp + XFS.file_offset + 4], esi mov [ebp + XFS.buffer_pos], edi mov eax, dword[edx + xfs_inode.di_core.di_size + 4] ; lo bswap eax mov dword[ebp + XFS.bytes_left_in_file + 0], eax ; lo mov eax, dword[edx + xfs_inode.di_core.di_size + 0] ; hi bswap eax mov dword[ebp + XFS.bytes_left_in_file + 4], eax ; hi mov eax, [edx + xfs_inode.di_core.di_nextents] bswap eax mov [ebp + XFS.left_extents], eax mov dword[ebp + XFS.bytes_read], 0 ; actually read bytes push ebx ecx edx esi edi mov [ebp + XFS.eof], 0 mov eax, dword[ebp + XFS.file_offset + 0] mov edx, dword[ebp + XFS.file_offset + 4] add eax, [ebp + XFS.bytes_to_read] adc edx, 0 sub eax, dword[ebp + XFS.bytes_left_in_file + 0] sbb edx, dword[ebp + XFS.bytes_left_in_file + 4] jc @f ; file_offset + bytes_to_read < file_size jz @f ; file_offset + bytes_to_read = file_size mov [ebp + XFS.eof], 1 cmp edx, 0 jne .error.eof sub dword[ebp + XFS.bytes_to_read], eax jc .error.eof jz .error.eof @@: stdcall xfs_btree_read, 0, 0, 1 pop edi esi edx ecx ebx test eax, eax jnz .error cmp [ebp + XFS.eof], 1 jne .quit jmp .error.eof .quit: call xfs_unlock pop edi esi edx ecx ebx xor eax, eax mov ebx, [ebp + XFS.bytes_read] ;DEBUGF 1,"quit: %d\n\n",ebx ret .error.eof: movi eax, ERROR_END_OF_FILE .error: ;DEBUGF 1,"error\n\n" call xfs_unlock pop edi esi edx ecx ebx mov ebx, [ebp + XFS.bytes_read] ret ;---------------------------------------------------------------- ; push max_offset_hi ; push max_offset_lo ; push nextents ; push block_number_hi ; push block_number_lo ; push extent_list ; -1 / read block number ;---------------------------------------------------------------- xfs_extent_list_read_dirblock: ; skips holes ;DEBUGF 1,"xfs_extent_list_read_dirblock\n" push ebx esi edi ;mov eax, [esp+28] ;DEBUGF 1,"nextents: %d\n",eax ;mov eax, [esp+20] ;mov edx, [esp+24] ;DEBUGF 1,"block_number: 0x%x%x\n",edx,eax ;mov eax, [esp+32] ;mov edx, [esp+36] ;DEBUGF 1,"max_addr : 0x%x%x\n",edx,eax mov ebx, [esp + 16] mov esi, [esp + 20] mov edi, [esp + 24] ; mov ecx, [esp + 28] ; nextents .next_extent: ;DEBUGF 1,"next_extent\n" dec dword[esp + 28] js .error stdcall xfs_extent_unpack, ebx add ebx, sizeof.xfs_bmbt_rec ; next extent mov edx, dword[ebp + XFS.extent.br_startoff + 4] mov eax, dword[ebp + XFS.extent.br_startoff + 0] cmp edx, [esp + 36] ; max_offset_hi ja .error jb @f cmp eax, [esp + 32] ; max_offset_lo jae .error @@: cmp edi, edx jb .hole ja .check_count cmp esi, eax jb .hole ja .check_count jmp .read_block .hole: ;DEBUGF 1,"hole\n" mov esi, eax mov edi, edx jmp .read_block .check_count: ;DEBUGF 1,"check_count\n" add eax, [ebp + XFS.extent.br_blockcount] adc edx, 0 cmp edi, edx ja .next_extent jb .read_block cmp esi, eax jae .next_extent ; jmp .read_block .read_block: ;DEBUGF 1,"read_block\n" push esi edi sub esi, dword[ebp + XFS.extent.br_startoff + 0] sbb edi, dword[ebp + XFS.extent.br_startoff + 4] add esi, dword[ebp + XFS.extent.br_startblock + 0] adc edi, dword[ebp + XFS.extent.br_startblock + 4] stdcall xfs_read_dirblock, esi, edi, [ebp + XFS.cur_dirblock] pop edx eax .quit: ;DEBUGF 1,"xfs_extent_list_read_dirblock: quit\n" pop edi esi ebx ret 24 .error: ;DEBUGF 1,"xfs_extent_list_read_dirblock: error\n" xor eax, eax dec eax mov edx, eax pop edi esi ebx ret 24 ;---------------------------------------------------------------- ; push dirblock_num ; push nextents ; push extent_list ;---------------------------------------------------------------- xfs_dir2_node_get_numfiles: ; unfortunately, we need to set 'total entries' field ; this often requires additional effort, since there is no such a number in most directory ondisk formats ;DEBUGF 1,"xfs_dir2_node_get_numfiles\n" push ebx ecx edx esi edi mov eax, [esp + 24] mov edx, [esp + 28] mov esi, [esp + 32] stdcall xfs_extent_list_read_dirblock, eax, esi, 0, edx, -1, -1 mov ecx, eax and ecx, edx inc ecx jnz @f movi eax, ERROR_FS_FAIL jmp .error @@: mov ebx, [ebp + XFS.cur_dirblock] cmp word[ebx + xfs_da_intnode.hdr.info.magic], XFS_DA_NODE_MAGIC je .node cmp word[ebx + xfs_da_intnode.hdr.info.magic], XFS_DIR2_LEAFN_MAGIC je .leaf mov eax, ERROR_FS_FAIL jmp .error .node: ;DEBUGF 1,".node\n" mov edi, [ebx + xfs_da_intnode.hdr.info.forw] bswap edi mov eax, [esp + 24] mov edx, [esp + 28] mov esi, [ebx + xfs_da_intnode.btree.before] bswap esi stdcall xfs_dir2_node_get_numfiles, eax, edx, esi test eax, eax jnz .error jmp .common .leaf: ;DEBUGF 1,".leaf\n" movzx ecx, word[ebx + xfs_dir2_leaf.hdr.count] xchg cl, ch movzx eax, word[ebx + xfs_dir2_leaf.hdr.stale] xchg al, ah sub ecx, eax add [ebp + XFS.entries_read], ecx mov edi, [ebx + xfs_dir2_leaf.hdr.info.forw] bswap edi jmp .common .common: test edi, edi jz .quit mov esi, edi mov eax, [esp + 24] mov edx, [esp + 28] stdcall xfs_dir2_node_get_numfiles, eax, edx, esi test eax, eax jnz .error jmp .quit .quit: ;DEBUGF 1,".quit\n" pop edi esi edx ecx ebx xor eax, eax ret 12 .error: ;DEBUGF 1,".error\n" pop edi esi edx ecx ebx movi eax, ERROR_FS_FAIL ret 12 ;---------------------------------------------------------------- ; push hash ; push dirblock_num ; push nextents ; push extent_list ;---------------------------------------------------------------- xfs_dir2_lookupdir_node: DEBUGF 1,"xfs_dir2_lookupdir_node\n" push ebx edx esi edi mov eax, [esp + 20] mov edx, [esp + 24] mov esi, [esp + 28] DEBUGF 1,"read dirblock: 0x%x %d\n",esi,esi stdcall xfs_extent_list_read_dirblock, eax, esi, 0, edx, -1, -1 DEBUGF 1,"dirblock read: 0x%x%x\n",edx,eax mov ecx, eax and ecx, edx inc ecx jnz @f movi eax, ERROR_FS_FAIL jmp .error @@: DEBUGF 1,"checkpoint #1\n" mov ebx, [ebp + XFS.cur_dirblock] cmp word[ebx + xfs_da_intnode.hdr.info.magic], XFS_DA_NODE_MAGIC je .node cmp word[ebx + xfs_da_intnode.hdr.info.magic], XFS_DIR2_LEAFN_MAGIC je .leaf mov eax, ERROR_FS_FAIL DEBUGF 1,"checkpoint #2\n" jmp .error .node: DEBUGF 1,".node\n" mov edi, [esp + 32] ; hash movzx ecx, word[ebx + xfs_da_intnode.hdr.count] xchg cl, ch mov [ebp + XFS.left_leaves], ecx xor ecx, ecx .node.next_leaf: mov esi, [ebx + xfs_da_intnode.btree + ecx*sizeof.xfs_da_node_entry + xfs_da_node_entry.hashval] bswap esi cmp edi, esi jbe .node.leaf_found inc ecx cmp ecx, [ebp + XFS.left_leaves] jne .node.next_leaf mov eax, ERROR_FILE_NOT_FOUND jmp .error @@: .node.leaf_found: mov eax, [esp + 20] mov edx, [esp + 24] mov esi, [ebx + xfs_da_intnode.btree + ecx*sizeof.xfs_da_node_entry + xfs_da_node_entry.before] bswap esi stdcall xfs_dir2_lookupdir_node, eax, edx, esi, edi test eax, eax jz .quit movi eax, ERROR_FILE_NOT_FOUND jmp .error .leaf: DEBUGF 1,".leaf\n" movzx ecx, [ebx + xfs_dir2_leaf.hdr.count] xchg cl, ch lea esi, [ebx + xfs_dir2_leaf.ents] mov eax, [esp + 32] stdcall xfs_get_addr_by_hash, esi, ecx cmp eax, -1 je .error mov ecx, eax jmp .quit .quit: DEBUGF 1,".quit\n" pop edi esi edx ebx xor eax, eax ret 16 .error: DEBUGF 1,".error\n" pop edi esi edx ebx ret 16 ;---------------------------------------------------------------- ; push dirblock_num ; push nextents ; push extent_list ;---------------------------------------------------------------- xfs_dir2_btree_get_numfiles: ;DEBUGF 1,"xfs_dir2_node_get_numfiles\n" push ebx ecx edx esi edi mov eax, [esp + 24] mov edx, [esp + 28] mov esi, [esp + 32] stdcall xfs_extent_list_read_dirblock, eax, esi, 0, edx, -1, -1 mov ecx, eax and ecx, edx inc ecx jnz @f movi eax, ERROR_FS_FAIL jmp .error @@: mov ebx, [ebp + XFS.cur_dirblock] cmp word[ebx + xfs_da_intnode.hdr.info.magic], XFS_DA_NODE_MAGIC je .node cmp word[ebx + xfs_da_intnode.hdr.info.magic], XFS_DIR2_LEAFN_MAGIC je .leaf mov eax, ERROR_FS_FAIL jmp .error .node: ;DEBUGF 1,".node\n" mov edi, [ebx + xfs_da_intnode.hdr.info.forw] bswap edi mov eax, [esp + 24] mov edx, [esp + 28] mov esi, [ebx + xfs_da_intnode.btree.before] bswap esi stdcall xfs_dir2_node_get_numfiles, eax, edx, esi test eax, eax jnz .error jmp .common .leaf: ;DEBUGF 1,".leaf\n" movzx ecx, word[ebx + xfs_dir2_leaf.hdr.count] xchg cl, ch movzx eax, word[ebx + xfs_dir2_leaf.hdr.stale] xchg al, ah sub ecx, eax add [ebp + XFS.entries_read], ecx mov edi, [ebx + xfs_dir2_leaf.hdr.info.forw] bswap edi jmp .common .common: test edi, edi jz .quit mov esi, edi mov eax, [esp + 24] mov edx, [esp + 28] stdcall xfs_dir2_node_get_numfiles, eax, edx, esi test eax, eax jnz .error jmp .quit .quit: ;DEBUGF 1,".quit\n" pop edi esi edx ecx ebx xor eax, eax ret 12 .error: ;DEBUGF 1,".error\n" pop edi esi edx ecx ebx movi eax, ERROR_FS_FAIL ret 12 ;---------------------------------------------------------------- ; push is_root ; push block_hi ; push block_lo ;---------------------------------------------------------------- xfs_btree_read: push ebx ecx edx esi edi cmp dword[esp + 32], 1 ; is root? je .root jmp .not_root .root: DEBUGF 1,".root\n" mov ebx, [ebp + XFS.cur_inode_save] add ebx, xfs_inode.di_u movzx edx, [ebx + xfs_bmdr_block.bb_numrecs] xchg dl, dh dec edx add ebx, sizeof.xfs_bmdr_block xor eax, eax dec eax .root.next_key: DEBUGF 1,".root.next_key\n" cmp [ebp + XFS.bytes_to_read], 0 je .quit inc eax cmp eax, edx ; out of keys? ja .root.key_found ; there is no length field, so try the last key lea edi, [ebx + sizeof.xfs_bmbt_key*eax + 0] lea esi, [ebx + sizeof.xfs_bmbt_key*eax + 4] bswap edi bswap esi mov ecx, [ebp + XFS.blocklog] shld edi, esi, cl shl esi, cl cmp edi, dword[ebp + XFS.file_offset + 4] ja .root.prev_or_hole jb .root.next_key cmp esi, dword[ebp + XFS.file_offset + 0] ja .root.prev_or_hole jb .root.next_key jmp .root.key_found .root.prev_or_hole: DEBUGF 1,".root.prev_or_hole\n" test eax, eax jz .root.hole dec eax jmp .root.key_found .root.hole: DEBUGF 1,".root.hole\n" push eax edx esi edi mov ecx, [ebp + XFS.blocklog] shld edi, esi, cl shl esi, cl sub esi, dword[ebp + XFS.file_offset + 0] sbb edi, dword[ebp + XFS.file_offset + 4] mov ecx, [ebp + XFS.bytes_to_read] cmp edi, 0 ; hole size >= 2^32 jne @f cmp ecx, esi jbe @f mov ecx, esi @@: add dword[ebp + XFS.file_offset + 0], ecx adc dword[ebp + XFS.file_offset + 4], 0 sub [ebp + XFS.bytes_to_read], ecx xor eax, eax mov edi, [ebp + XFS.buffer_pos] rep stosb mov [ebp + XFS.buffer_pos], edi pop edi esi edx eax jmp .root.next_key .root.key_found: DEBUGF 1,".root.key_found\n" mov edx, [ebp + XFS.cur_inode_save] mov eax, [ebp + XFS.inodesize] sub eax, xfs_inode.di_u cmp [edx + xfs_inode.di_core.di_forkoff], 0 je @f movzx eax, [edx + xfs_inode.di_core.di_forkoff] shl eax, XFS_DIR2_DATA_ALIGN_LOG ; 3 @@: sub eax, sizeof.xfs_bmdr_block shr eax, 4 ;log2(sizeof.xfs_bmbt_key + sizeof.xfs_bmdr_ptr) mov edx, [ebx + sizeof.xfs_bmbt_key*eax + 0] ; hi mov eax, [ebx + sizeof.xfs_bmbt_key*eax + 4] ; hi bswap edx bswap eax stdcall xfs_btree_read, eax, edx, 0 test eax, eax jnz .error jmp .root.next_key .not_root: DEBUGF 1,".root.not_root\n" mov eax, [esp + 24] ; block_lo mov edx, [esp + 28] ; block_hi mov ebx, [ebp + XFS.cur_block] stdcall xfs_read_block test eax, eax jnz .error mov ebx, [ebp + XFS.cur_block] cmp [ebx + xfs_bmbt_block.bb_magic], XFS_BMAP_MAGIC jne .error cmp [ebx + xfs_bmbt_block.bb_level], 0 ; leaf? je .leaf jmp .node .node: ; mov eax, [ebp + XFS.blocksize] ; sub eax, sizeof.xfs_bmbt_block ; shr eax, 4 ; maxnumrecs mov eax, dword[ebp + XFS.file_offset + 0] ; lo mov edx, dword[ebp + XFS.file_offset + 4] ; hi movzx edx, [ebx + xfs_bmbt_block.bb_numrecs] xchg dl, dh dec edx add ebx, sizeof.xfs_bmbt_block xor eax, eax dec eax .node.next_key: push eax ecx edx esi edi mov eax, [esp + 44] ; block_lo mov edx, [esp + 48] ; block_hi mov ebx, [ebp + XFS.cur_block] stdcall xfs_read_block test eax, eax jnz .error mov ebx, [ebp + XFS.cur_block] add ebx, sizeof.xfs_bmbt_block pop edi esi edx ecx eax cmp [ebp + XFS.bytes_to_read], 0 je .quit inc eax cmp eax, edx ; out of keys? ja .node.key_found ; there is no length field, so try the last key lea edi, [ebx + sizeof.xfs_bmbt_key*eax + 0] lea esi, [ebx + sizeof.xfs_bmbt_key*eax + 4] bswap edi bswap esi mov ecx, [ebp + XFS.blocklog] shld edi, esi, cl shl esi, cl cmp edi, dword[ebp + XFS.file_offset + 4] ja .node.prev_or_hole jb .node.next_key cmp esi, dword[ebp + XFS.file_offset + 0] ja .node.prev_or_hole jb .node.next_key jmp .node.key_found .node.prev_or_hole: test eax, eax jz .node.hole dec eax jmp .node.key_found .node.hole: push eax edx esi edi mov ecx, [ebp + XFS.blocklog] shld edi, esi, cl shl esi, cl sub esi, dword[ebp + XFS.file_offset + 0] sbb edi, dword[ebp + XFS.file_offset + 4] mov ecx, [ebp + XFS.bytes_to_read] cmp edi, 0 ; hole size >= 2^32 jne @f cmp ecx, esi jbe @f mov ecx, esi @@: add dword[ebp + XFS.file_offset + 0], ecx adc dword[ebp + XFS.file_offset + 4], 0 sub [ebp + XFS.bytes_to_read], ecx xor eax, eax mov edi, [ebp + XFS.buffer_pos] rep stosb mov [ebp + XFS.buffer_pos], edi pop edi esi edx eax jmp .node.next_key .node.key_found: mov edx, [ebp + XFS.cur_inode_save] mov eax, [ebp + XFS.inodesize] sub eax, xfs_inode.di_u cmp [edx + xfs_inode.di_core.di_forkoff], 0 je @f movzx eax, [edx + xfs_inode.di_core.di_forkoff] shl eax, XFS_DIR2_DATA_ALIGN_LOG ; 3 @@: sub eax, sizeof.xfs_bmdr_block shr eax, 4 ;log2(sizeof.xfs_bmbt_key + sizeof.xfs_bmdr_ptr) mov edx, [ebx + sizeof.xfs_bmbt_key*eax + 0] ; hi mov eax, [ebx + sizeof.xfs_bmbt_key*eax + 4] ; hi bswap edx bswap eax stdcall xfs_btree_read, eax, edx, 0 test eax, eax jnz .error jmp .node.next_key jmp .quit .leaf: jmp .quit .error: pop edi esi edx ecx ebx movi eax, ERROR_FS_FAIL ret 4 .quit: pop edi esi edx ecx ebx xor eax, eax ret 4 ;---------------------------------------------------------------- ; push nextents ; push extent_list ; push file_offset_hi ; push file_offset_lo ;---------------------------------------------------------------- ;xfs_extent_list_read: ; push ebx 0 edx esi edi ; zero means actually_read_bytes ; ; .quit: ; pop edi esi edx ecx ebx ; xor eax, eax ; ret 24 ; .error: ; pop edi esi edx ecx ebx ; ret 24