Null in file after crash
Berhardt Eckl
bernhardt.eckl at hotmail.de
Sat May 5 05:39:42 CDT 2012
Hello all,
after a XFS recovery, caused by a system crash, one of my files seems to be trashed. The file contains an encrypted container and can not be mounted since that crash. Hexedit shows some parts are filled with 0 Bytes.
The crash happened some time ago in 2005, the filesystem was dumped and nearly untouched since then. I can not tell which kernel or XFS version was used.
Xfs_bmap shows many holes, so it looks like a problem mentioned here: http://xfs.org/index.php/XFS_FAQ#Q:_Why_do_I_see_binary_NULLS_in_some_files_after_recovery_when_I_unplugged_the_power.3F
Is there any chance to revert to the state the file was before the crash? Or maybe anything else that could help to restore the file?
Some of the "missing parts" can be found via hexedit the dump, so at least some of the missing "holes" are still on the disc.
xfs_bmap output:
0: [0..7]: hole
1: [8..23]: 1016..1031
2: [24..31]: 2504..2511
3: [32..39]: hole
4: [40..79]: 200..239
5: [80..87]: 3008..3015
6: [88..3479]: hole
7: [3480..3583]: 96..199
8: [3584..3599]: 1064..1079
9: [3600..3711]: 1744..1855
10: [3712..3767]: 2032..2087
11: [3768..3815]: 2192..2239
12: [3816..3831]: 2256..2271
13: [3832..3895]: 2280..2343
14: [3896..3935]: 2416..2455
15: [3936..3975]: 2464..2503
16: [3976..4071]: 2632..2727
17: [4072..4463]: hole
18: [4464..4471]: 2512..2519
19: [4472..4487]: 1000..1015
20: [4488..4495]: hole
21: [4496..4511]: 1160..1175
22: [4512..4575]: hole
23: [4576..4583]: 2000..2007
24: [4584..4631]: 1080..1127
25: [4632..4639]: hole
26: [4640..4663]: 1136..1159
27: [4664..4679]: 2008..2023
28: [4680..298991]: hole
29: [298992..299023]: 2728..2759
30: [299024..299127]: hole
31: [299128..299143]: 2760..2775
32: [299144..356103]: hole
33: [356104..356223]: 240..359
34: [356224..390023]: hole
35: [390024..390039]: 3032..3047
36: [390040..393847]: hole
37: [393848..393887]: 2856..2895
38: [393888..396711]: hole
39: [396712..396727]: 1032..1047
40: [396728..396743]: 2896..2911
41: [396744..396959]: hole
42: [396960..396975]: 2912..2927
43: [396976..397495]: hole
44: [397496..397511]: 1392..1407
45: [397512..397855]: hole
46: [397856..397879]: 2928..2951
47: [397880..397895]: hole
48: [397896..397911]: 1968..1983
49: [397912..397935]: hole
50: [397936..397951]: 1048..1063
51: [397952..397959]: 2272..2279
52: [397960..397967]: 2456..2463
53: [397968..398071]: hole
54: [398072..398103]: 1184..1215
55: [398104..398135]: 3048..3079
56: [398136..398151]: 1984..1999
57: [398152..398167]: 3080..3095
58: [398168..399639]: hole
59: [399640..399655]: 3096..3111
60: [399656..420575]: hole
61: [420576..420591]: 3112..3127
62: [420592..486767]: hole
63: [486768..486783]: 1216..1231
64: [486784..486991]: hole
65: [486992..487007]: 1232..1247
66: [487008..488071]: hole
67: [488072..488087]: 3128..3143
68: [488088..494023]: hole
69: [494024..494039]: 2088..2103
70: [494040..494175]: hole
71: [494176..494191]: 3144..3159
72: [494192..494495]: hole
73: [494496..494511]: 1248..1263
74: [494512..494519]: 2952..2959
75: [494520..495807]: hole
76: [495808..495823]: 3160..3175
77: [495824..496103]: hole
78: [496104..496119]: 3176..3191
79: [496120..496183]: hole
80: [496184..496231]: 2960..3007
81: [496232..496239]: hole
82: [496240..496255]: 3016..3031
83: [496256..496303]: hole
84: [496304..496319]: 3192..3207
85: [496320..510471]: hole
86: [510472..510487]: 2104..2119
87: [510488..510543]: hole
88: [510544..510559]: 2176..2191
89: [510560..939639]: hole
90: [939640..939655]: 1264..1279
91: [939656..998999]: hole
92: [999000..999015]: 1280..1295
93: [999016..1045607]: hole
94: [1045608..1045623]: 2120..2135
95: [1045624..1362151]: hole
96: [1362152..1362167]: 1328..1343
97: [1362168..1513727]: hole
98: [1513728..1513743]: 1312..1327
99: [1513744..1513823]: hole
100: [1513824..1513839]: 2776..2791
101: [1513840..1546375]: hole
102: [1546376..1546391]: 2792..2807
103: [1546392..1557199]: hole
104: [1557200..1557215]: 2808..2823
105: [1557216..1563711]: hole
106: [1563712..1563727]: 2824..2839
107: [1563728..1564167]: hole
108: [1564168..1564183]: 2840..2855
109: [1564184..1682495]: hole
110: [1682496..1682503]: 2344..2351
111: [1682504..1780503]: hole
112: [1780504..1780607]: 768..871
113: [1780608..1837999]: hole
114: [1838000..1838015]: 2136..2151
115: [1838016..1865223]: hole
116: [1865224..1865239]: 2160..2175
117: [1865240..1875359]: hole
118: [1875360..1875367]: 2240..2247
119: [1875368..1878679]: hole
120: [1878680..1878687]: 2152..2159
121: [1878688..1886607]: hole
122: [1886608..1886719]: 360..471
123: [1886720..1898679]: hole
124: [1898680..1898751]: 472..543
125: [1898752..1905519]: hole
126: [1905520..1905559]: 2552..2591
127: [1905560..1906359]: hole
128: [1906360..1906375]: 2352..2367
129: [1906376..1912095]: hole
130: [1912096..1912191]: 544..639
131: [1912192..1916703]: hole
132: [1916704..1916711]: 2368..2375
133: [1916712..1929999]: hole
134: [1930000..1930039]: 1544..1583
135: [1930040..1930151]: hole
136: [1930152..1930175]: 2392..2415
137: [1930176..1953935]: hole
138: [1953936..1953959]: 2608..2631
139: [1953960..1959895]: hole
140: [1959896..1959903]: 2592..2599
141: [1959904..1960455]: hole
142: [1960456..1960479]: 2528..2551
143: [1960480..1961495]: hole
144: [1961496..1961503]: 2024..2031
145: [1961504..1961511]: 2520..2527
146: [1961512..1965975]: hole
147: [1965976..1966039]: 1856..1919
148: [1966040..2023615]: hole
149: [2023616..2023631]: 2376..2391
150: [2023632..2171271]: hole
151: [2171272..2171279]: 1352..1359
152: [2171280..2317303]: hole
153: [2317304..2317359]: 704..759
154: [2317360..2341399]: hole
155: [2341400..2341415]: 1296..1311
156: [2341416..2660815]: hole
157: [2660816..2660823]: 2248..2255
158: [2660824..2664023]: hole
159: [2664024..2664071]: 1584..1631
160: [2664072..2670455]: hole
161: [2670456..2670487]: 1360..1391
162: [2670488..2678431]: hole
163: [2678432..2678503]: 872..943
164: [2678504..2685759]: hole
165: [2685760..2685815]: 944..999
166: [2685816..2700175]: hole
167: [2700176..2700183]: 1128..1135
168: [2700184..2707711]: hole
169: [2707712..2707719]: 1176..1183
170: [2707720..2721447]: hole
171: [2721448..2721495]: 1920..1967
172: [2721496..2767527]: hole
173: [2767528..2767639]: 1632..1743
174: [2767640..2811607]: hole
175: [2811608..2811615]: 1344..1351
176: [2811616..2811623]: 2600..2607
177: [2811624..2811671]: hole
178: [2811672..2811687]: 1408..1423
179: [2811688..2852159]: hole
180: [2852160..2852223]: 640..703
181: [2852224..3041159]: hole
182: [3041160..3041167]: 1424..1431
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