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'''
术语规范：
简述：BS指256M，bs指256K
BS：指大小，256M
bs：指大小，256K
SecsPerBS：每BS扇区数
SecsPerbs：每bs扇区数
FRid：文件记录号
FRDs：文件记录在整个LUN上应该的物理扇区号
FRDBS：文件记录在整个LUN上应该的BS号
FRDbs：文件记录在整个LUN上应该的bs号
FRDbsiBS:文件记录所在的bs，在所在BS中的序号
FRDSibs：文件记录所在的扇区，在所在的bs中的序号
SMDid：位图所在的磁盘号
SMBS：位图所在的磁盘的BS号
SMbs：位图所在的磁盘的bs号
SMDs:位图的起始扇区号
SDid：源数据所在的磁盘号
SDBS：源数据所在的BS号
SDbs：源数据所在的bs号
SDs：源数据所在的扇区号
SDSibs：源数据所在的扇区，在所在的bs中的序号
SDbsiBS：源数据所在的bs，在所在的BS中的序号
Mbsi8GM：数据所在bs条目，在8G位图中的序号
MbsiBS：数据所在的bs条目，在当前BS位图中的序号
MBSi8GM：数据所在的BS条目，在8G位图中的序号
'''
import
sys
import
os
import
struct
import
sqlite3
import
time
BS
=
256
*
1024
*
1024
bs
=
256
*
1024
SecsPerBS
=
BS
/
/
512
SecsPerbs
=
bs
/
/
512
bs_tnum
=
128
*
1024
*
1024
def
trans(FRid, MFT_Slice_List):
mft_no_clus
=
FRid
/
/
8
mft_no_sec
=
(FRid
%
8
)
*
2
for
i
in
MFT_Slice_List:
if
i[
0
]
+
i[
2
] > mft_no_clus:
if
i[
0
] > mft_no_clus:
continue
FRDs
=
(mft_no_clus
-
i[
0
]
+
i[
1
])
*
16
+
mft_no_sec
break
FRDs
+
=
262208
# DBR pos
return
FRDs
def
find_FRid_SDbs(FRid):
mftlist
=
[]
FRDS
=
trans(FRid, MFT_Slice_List)
# cu_mft 是 allv2.db 的cursor
cu_mft.execute(r
"select * from mft_info WHERE FRID = %d"
%
FRid)
rows
=
cu_mft.fetchall()
# SDid, SDS, FRid 是 row[0], row[1], row[2]
new
=
0
for
row
in
rows:
if
row[
1
]
%
512
=
=
FRDS
%
512
:
# 扇区号一致
new
+
=
1
SDid
=
row[
0
]
SDS
=
row[
1
]
mftlist.append([FRid, FRDS, SDid, SDS])
if
new !
=
1
:
# 所选记录不唯一， 返回空的 mftlist
print
(
"FR(%d), result not found or not only, new = %d, FRDS = %d"
%
(FRid, new, FRDS))
# os.system("pause")
# pass
return
return
mftlist
def
find_bs_SMBS(FRDs, SDid, SDs):
SMDBS_list
=
[]
# 位图列表
FRbs
=
(FRDs
/
/
512
)
SDBS
=
SDs
/
/
SecsPerBS
SDbsiBS
=
(SDs
%
SecsPerBS)
/
/
SecsPerbs
print
(
"FRDs,SDid,SDs is:"
,FRDs,SDid,SDs)
print
(
"SDbsiBS is %d"
%
SDbsiBS)
# cu_m 是 map_v2.db 的 cursor
cu_m.execute(r
"select * from map_info where v_num = %d"
%
(FRbs
*
512
+
1
))
# +1: 是因为v7000 MAP最低位为1，可能表示类型
rows
=
cu_m.fetchall()
print
(
"rows: "
, rows)
os.system(
"pause"
)
x
=
0
# EM_SMDid, EM_SMBS, EM_Mbsi8GM, EM_FRDS_add_1 = range(4)
for
row
in
rows:
Mbsi8GM
=
row[
2
]
# 数据所在bs条目，在8G位图中的序号
FRDbsiBS
=
(FRDs
%
SecsPerBS)
/
/
SecsPerbs
MbsiBS
=
(Mbsi8GM
+
2
)
%
1024
# 数据所在的bs条目，在当前BS位图中的序号
MBSi8GM
=
(Mbsi8GM
+
2
)
/
/
1024
# 数据所在的BS条目，在8G位图中的序号
print
(
"MBSi8GM,SDbsiBS,MbsiBS is"
, MBSi8GM, SDbsiBS, MbsiBS)
os.system(
"pause"
)
if
MBSi8GM
=
=
0
:
if
SDbsiBS
=
=
MbsiBS:
x
+
=
1
SMDid
=
row[
0
]
# 位图所在的磁盘号
SMBS
=
row[
1
]
# 位图所在的磁盘的BS号
SMDBS_list.append([SMDid, SMBS,
0
, SMDid, SMBS])
else
:
if
SDbsiBS
=
=
MbsiBS:
x
+
=
1
SMDid
=
row[
0
]
# 位图所在的磁盘号
SMBS
=
row[
1
]
# 位图所在的磁盘的BS号
SMDBS_list.append([SMDid, SMBS, MBSi8GM, SDid, SDBS])
SMDBS_list.append([SMDid, SMBS,
0
, SMDid, SMBS])
if
x
=
=
0
:
print
(
"FRDs:%d result not found!"
%
FRDs)
# os.system("pause")
# pass
print
(
"line 131 ,x == 0"
)
return
os.system(
"pause"
)
print
(SMDBS_list)
return
SMDBS_list
#tmp1 writefile to disk
writedisk
=
False
if
writedisk:
fd
=
open
(
"\\\\.\\physicaldrive3"
,
'rb+'
)
def
update_1Gmap(bsMapList, map1g_list):
SMDid, SMBS, MBSi8GM, SDid, SDBS
=
bsMapList
SMDs
=
SMBS
*
SecsPerBS
+
1024
SDbs
=
SDBS
*
1024
smFile
=
sDisk[SMDid][
1
]
# 位图所在磁盘
sdFile
=
sDisk[SDid][
1
]
# 数据所在磁盘
# 到指定位图位置，读取 bs = 256K 字节
smFile.seek(SMDs
*
512
)
mData
=
smFile.read(bs)
if
MBSi8GM
=
=
0
:
# 8GB 的第一个256K
mapitem
=
struct.unpack_from(
"1022Q"
, mData,
0
)
start_sec
=
1024
elif
MBSi8GM <
32
:
# print("MBSi8gm IS",MBSi8GM)
mapitem
=
struct.unpack_from(
"1024Q"
, mData, MBSi8GM
*
8192
-
16
)
# 1024 * 8 代表一个256M
start_sec
=
0
else
:
return
t
=
0
keyMap
=
SMDid
*
1000000
+
SMBS
*
100
+
MBSi8GM
cu.execute(r
"INSERT or ignore into MAP values(%d, %d, %d, %d, %d, %d)"
%
(keyMap, SMDid, SMBS, MBSi8GM, SDid, SDBS))
cx.commit()
# print(keyMap, SMDid, SMBS, MBSi8GM, SDid, SDBS)
# os.system("pause")
for
ii
in
mapitem:
if
ii
=
=
3
:
# 跳过位图为3的
t
+
=
1
continue
FRDbs
=
(ii
-
1
)
/
/
512
if
FRDbs > bs_tnum:
t
+
=
1
print
(
"FRDBS is too large, FRDbs: %d"
%
FRDbs)
else
:
value1
=
(SDbs
+
t)
*
SecsPerbs
+
start_sec
# value指应该的bs的扇区位置
value
=
value1
+
(SDid <<
48
)
# valueT = 0
if
map1g_list[FRDbs] !
=
0
and
map1g_list[FRDbs] !
=
value:
print
(
"FRDBS is error, FRDbs: %d,\tmap1g_list[FRDbs]:%08X\tvalue:%08X"
%
(FRDbs, map1g_list[FRDbs], value))
os.system(
"pause"
)
# pass
else
:
map1g_list[FRDbs]
=
value
#tmp1 write file
if
writedisk:
fd.seek(FRDbs
*
512
)
sDisk[SDid][
1
].seek(value
*
512
)
tmpdata
=
sDisk[SDid][
1
].read(bs)
fd.write()
#tmp write file end
# SMDid, SMBS, MBSi8GM, SDid, SDBS
t
+
=
1
sDisk
=
[]
sDisk.append("")
sDisk.append("")
sDisk.append("")
sDisk.append("")
sDisk.append([
"h:\mdisk4.img"
,
0
])
sDisk.append([
"g:\mdisk5.img"
,
0
])
sDisk.append([
"i:\mdisk6.img"
,
0
])
sDisk.append([
"d:\mdisk7.img"
,
0
])
sDisk.append([
"e:\mdisk8.img"
,
0
])
sDisk.append([
"f:\mdisk9.img"
,
0
])
for
disk
in
sDisk[
4
:
10
]:
disk[
1
]
=
open
(disk[
0
],
'rb'
)
cx_mft
=
sqlite3.connect(
"f:\zy\\new_mft\\allv2.db"
)
cu_mft
=
cx_mft.cursor()
cx_m
=
sqlite3.connect(
"F:\\zy\\map\\map_v2.db"
)
cu_m
=
cx_m.cursor()
cx
=
sqlite3.connect(
"f:\\zy\\map\\256M_to_disk_map.db"
)
cu
=
cx.cursor()
cu.execute(
"""create table if not exists MAP(
mapKey INT PRIMARY KEY NOT NULL,
SMDid int,
SMDBS int,
Mbsi8GM int,
SDid int,
SDDBS int
);
"""
)
# 打开1GMAP文件，读入LIST
MAP_file
=
"F:\\zy\\map\\1gmap_1.img"
f_map1g
=
open
(MAP_file,
'rb+'
)
dmap
=
f_map1g.read()
map1g_list
=
list
(struct.unpack(
'%dQ'
%
bs_tnum, dmap))
# 前两个256M块
# cu.execute(r"INSERT or ignore into MAP values(%d, %d, %d, %d, %d, %d)" % (40080010, 4, 800, 10, 6, 814))
# cu.execute(r"INSERT or ignore into MAP values(%d, %d, %d, %d, %d, %d)" % (40080000, 4, 800, 0, 4, 800))
tlst
=
[[
4
,
800
,
10
,
6
,
814
], [
4
,
800
,
0
,
4
,
800
]]
update_1Gmap(tlst[
0
], map1g_list)
update_1Gmap(tlst[
1
], map1g_list)
# 解析mft_list 文件
f
=
open
(
"mft_list.txt"
,
'r'
)
# 位置在哪？？
d
=
f.readlines()
MFT_Slice_List
=
[]
for
i
in
d:
t
=
i.split()
# t[0] 是 VCN 号, t[1] 是 LCN 号, t[2] 是 连续簇数
MFT_Slice_List.append([
int
(t[
0
]),
int
(t[
1
]),
int
(t[
2
])])
# MFT的编号；在LUN中应该的扇区位置；现在所在的磁盘号；现在所在磁盘的扇区位置
# EL_FRid, EL_FRDS, EL_SDid, EL_SDS = range(4)
for
i
in
MFT_Slice_List[
2
:]:
print
(
"start: "
, i)
tt
=
0
# 用于累计KB数， 1 KB是一个FR
curFRID
=
i[
0
]
*
8
curFRID
=
1988304
# test1
slice0p
=
trans(curFRID, MFT_Slice_List)
# 要处理的第一个bs片断的起始扇区号
slice0s
=
512
-
slice0p
%
512
# 第一个片断的扇区数
slice0FRnum
=
slice0s
/
/
2
sliceEnd_s
=
(i[
2
]
*
16
+
slice0p)
%
512
# 最后一个片断的扇区数
middle_bs
=
(i[
2
]
*
16
-
slice0s
-
sliceEnd_s)
/
/
512
# 中间有多少个bs片断
for
ii
in
range
(middle_bs
+
2
):
if
ii
=
=
0
:
# 第一个片断
p
=
slice0p
start_fr
=
curFRID
fr_num
=
slice0FRnum
elif
ii
=
=
middle_bs
+
1
:
# 最后一个片断
p
=
ii
*
512
-
512
+
(slice0p
+
slice0s)
start_fr
=
curFRID
+
slice0FRnum
+
ii
*
256
fr_num
=
sliceEnd_s
/
/
2
else
:
p
=
ii
*
512
-
512
+
(slice0p
+
slice0s)
start_fr
=
curFRID
+
slice0FRnum
+
ii
*
256
fr_num
=
256
FRDbs
=
p
/
/
512
if
map1g_list[FRDbs] !
=
0
:
continue
isfoundmap
=
False
for
FRid1
in
range
(start_fr, start_fr
+
fr_num
+
1
):
mftlist
=
find_FRid_SDbs(FRid1)
# 在这个函数中，又求了一次 FRDS, ??
if
mftlist
is
None
:
continue
else
:
SMDBS_list
=
find_bs_SMBS(mftlist[
0
][
1
], mftlist[
0
][
2
], mftlist[
0
][
3
])
# print("SMDBS_list: ", SMDBS_list)
# SMDBS_list 可能完成多个匹配
if
SMDBS_list
is
None
:
break
else
:
isfoundmap
=
True
for
lst
in
SMDBS_list:
# print("********************")
#SMDBS_list = find_bs_SMBS(lst[1], lst[2], lst[3]) # SMDBS_list 可能完成多个匹配
print
(
"lins 293 "
,lst)
update_1Gmap(lst, map1g_list)
if
isfoundmap:
break
;
print
(
"line296"
)
os.system(
"pause"
)
print
(
"line 298"
)
os.system(
"pause"
)
print
(
"end:"
, time.strftime(
'%Y-%m-%d %H:%M:%S'
, time.localtime(time.time())))
dmap
=
struct.pack(
"%dQ"
%
bs_tnum,
*
map1g_list)
# 更新map文件
f_map1g.seek(
0
)
f_map1g.write(dmap)
f_map1g.close()
# cu.execute(r"INSERT or ignore into MAP values(%d, %d, %d, %d, %d, %d)" % (40080010, 4, 800, 10, 6, 814))
# 第一个256M块
# cu.execute(r"INSERT or ignore into MAP values(%d, %d, %d, %d, %d, %d)" % (40080000, 4, 800, 0, 4, 800))
# cx.commit()
# BS_ID含义如下：ABBBBBCC，A表示磁盘ID，BBBBB表示本片断位图在磁盘位置(256M块编号)，CC表示本次处理的256M块的编号(0-31)
# MAP_POS表示:256M的位置，一般位图仍要向后偏移1024个扇区
# BS_ID_indisk表示8G内的256M序号
# SOURCE_POS表示源磁盘的256M的位置
|
本文转自 张宇 51CTO博客，原文链接：http://blog.51cto.com/zhangyu/1955849，如需转载请自行联系原作者
