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Re: No success repairing my ext4 file system so far, PLEASE HELP!

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From Harry <simonsharry@gmail.com>
Newsgroups comp.os.linux.setup
Subject Re: No success repairing my ext4 file system so far, PLEASE HELP!
Date Mon, 16 Apr 2012 11:08:31 -0700 (PDT)
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On Monday, April 16, 2012 11:09:08 PM UTC+5:30, Harry wrote:
> On Monday, April 16, 2012 7:20:30 PM UTC+5:30, Robert Nichols wrote:
> > On 04/16/2012 04:39 AM, Harry wrote:
> > > On Monday, April 16, 2012 1:44:31 AM UTC+5:30, Robert Nichols wrote:
> > [SNIP]
> > >>   As a last resort you could do a brute force
> > >> search for a 16-bit integer 0xEF53 (little-endian, the byte order is 53 EF)
> > >> at offset 56 (0x48) in a sector, making that a possible superblock, then
> > >> use dmsetup to define a virtual device that begins 1024 bytes prior to that
> > >> sector and see what e2fsck has to say about that (use the "-n" option so
> > >> that it will open the device read-only).  Sounds like it might take a long
> > >> time, but probably no more than you've already spent.
> > >
> > >
> > > I think, you meant "offset 56 (0x38)".
> > 
> > Indeed!  Sorry about that.
> > 
> > > I have launched the script listed below. It doesn't do the virtual device mapping *yet*; for now, it just looks for the signature. I will add the device mapper later.
> > >
> > > After 43 minutes of running, I printed the progress (kill -10) and got this:
> > >      Trying sector 948135 of 146997248  .645001  %
> > >       ETA: 230 hours ( 9.58  days)
> > 
> > Yipe!  I've attached a C program that looks for a sector with the EF53
> > magic number plus a valid blocksize and a label string that is either
> > empty or contains valid ASCII characters.  It searched a 160GB partition
> > in about 45 minutes.
> > 
> > Note that you will need to subtract 1024 bytes from this offset when
> > setting up the virtual device.
> > 
> > -- 
> > Bob Nichols         AT comcast.net I am "RNichols42"
> > 
> > 
> > begin 664 e2finder.c
> > M(V1E9FEN92!?1DE,15]/1D93151?0DE44R`V-`HC:6YC;'5D92`\<W1D:6\N
> > M:#X*(VEN8VQU9&4@/'-T9&QI8BYH/@HC:6YC;'5D92`\<W1R:6YG+F@^"B-I
> > M;F-L=61E(#QE<G)N;RYH/@HC:6YC;'5D92`\8W1Y<&4N:#X*(VEN8VQU9&4@
> > M/&QI;G5X+V9S+F@^"B-I;F-L=61E(#QL:6YU>"]E>'0R7V9S+F@^"@HC9&5F
> > M:6YE('-P8B`H<VEZ96]F*&)U9BDO-3$R*0H*:6YT(&UA:6XH:6YT(&%R9V,L
> > M(&-H87(@*F%R9W9;72D@>PH@("`@;&]N9R!B;&MC;W5N=#L*("`@(&EN="!S
> > M96-T;W(L(&YS+"!P+"!O:SL*("`@('-T871I8R!C:&%R(&)U9ELT,#DV73L*
> > M("`@($9)3$4@*FEN9CL*("`@(&-H87(@*F-M9"P@*FQA8F5L.PH@("`@<W1R
> > M=6-T(&5X=#)?<W5P97)?8FQO8VL@*G-B7W!T<CL*"B`@("!I9B@H8VUD(#T@
> > M<W1R<F-H<BAA<F=V6S!=+"`G+R<I*2`A/2!.54Q,*2`@*RMC;60["B`@("!E
> > M;'-E("!C;60@/2!A<F=V6S!=.PH*("`@(&EF*&%R9V,@/"`R*2!["@EF<')I
> > M;G1F*'-T9&5R<BP@(E5S86=E.B`E<R!D979I8V5<;B(L(&-M9"D["@ER971U
> > M<FX@,3L*("`@('T*("`@(&EF*"AI;F8@/2!F;W!E;BAA<F=V6S%=+"`B<B(I
> > M*2`]/2!.54Q,*2!["@EP97)R;W(H87)G=ELQ72D["@ER971U<FX@,3L*("`@
> > M('T*"B`@("!P=71S*")">71E(&]F9G-E="`@<V5C=&]R("@U,3)"*2(I.PH@
> > M("`@<'5T<R@B+2TM+2TM+2TM+2TM("`M+2TM+2TM+2(I.PH@("`@8FQK8V]U
> > M;G0@/2`P.PH@("`@=VAI;&4H*&YS(#T@9G)E860H8G5F+"`U,3(L('-P8BP@
> > M:6YF*2D@/B`P*2!["@EF;W(H<V5C=&]R(#T@,#L@<V5C=&]R(#P@;G,[("LK
> > M('-E8W1O<BD@>PH)("`@('-B7W!T<B`]("AS=')U8W0@97AT,E]S=7!E<E]B
> > M;&]C:R`J*2AB=68K-3$R*G-E8W1O<BD["@D@("`@:68H<V)?<'1R+3YS7VUA
> > M9VEC(#T](#!X968U,RD@>PH)"6QA8F5L(#T@<V)?<'1R+3YS7W9O;'5M95]N
> > M86UE.PH)"6]K(#T@,#L*"0EF;W(H<"`](#`[('`@/"!S:7IE;V8H<V)?<'1R
> > M+3YS7W9O;'5M95]N86UE*3L@*RMP*2!["@D)("`@(&EF*&QA8F5L6W!=(#T]
> > M("=<,"<I('LK*V]K.R`@8G)E86L[?0H)"2`@("!I9B@A*&ES87-C:6DH;&%B
> > M96Q;<%TI*2D@(&)R96%K.PH)"2`@("!I9B@A*&ES9W)A<&@H;&%B96Q;<%TI
> > M('Q\(&ES8FQA;FLH;&%B96Q;<%TI*2D@(&)R96%K.PH)"7T*"0EI9B@H=6YS
> > M:6=N960I*'-B7W!T<BT^<U]L;V=?8FQO8VM?<VEZ92D@/B`R*2`@8V]N=&EN
> > M=64["@D):68H;VL@?'P@<#X]."D@>PH)"2`@("!P<FEN=&8H(B4C,#$R;'@@
> > M*"4X;&0I+"!L86)E;#U<(B4N,39S7"(L(&)S/25D:UQN(BP*"0D)("`@-3$R
> > M*BAB;&MC;W5N="MS96-T;W(I+`H)"0D@("`H8FQK8V]U;G0K<V5C=&]R*2P*
> > M"0D)("`@;&%B96PL"@D)"2`@(#$\/'-B7W!T<BT^<U]L;V=?8FQO8VM?<VEZ
> > M92D["@D)("`@(&9F;'5S:"AS=&1O=70I.PH)"7T*"2`@("!]"@E]"@EB;&MC
> > M;W5N="`K/2!N<SL*("`@('T*("`@(&EF*&9E;V8H:6YF*2D@>PH)9G!R:6YT
> > M9BAS=&1E<G(L(")%3T8@;VX@)7-<;B(L(&%R9W9;,5TI.PH)<F5T=7)N(#`[
> > M"B`@("!]"B`@("!E;'-E(&EF*&9E<G)O<BAI;F8I*2`@<&5R<F]R*&%R9W9;
> > 5,5TI.PH@("`@<F5T=7)N(#$["GT*
> > `
> > end
> 
> Bob,
> 
> I had to add this line before include <stdio.h> to get the program to compile:
>     #define umode_t mode_t
> 
> Because mode_t itself is defined as 'unsigned <something>', I took the quick liberty of doing the above without a sufficiently deeper thought on all its ramifications.
> 
> There were 1601 entries printed. I extracted the base 10 number (from the parentheses), subtracted 2 (sectors) from it, and used the resulting number in device mapping code as follows:
> 
> 
> # This just extracts the sector that has the e2 fs signature.
> # Actual subtraction will be done later below, in the script.
> 
> $ cat e2finder.log | sed -r 's/\(|\)|,//g' | field 2 > tmp
> $ cat tmp
> 8521728
>     ...
> 98174976
> 
> 
> ---------------------------------
> #!/bin/bash
> set -u
> 
> if [ -b /dev/mapper/foo ]; then
>     dmsetup remove foo
> fi 
> 
> bogusMax=100
> cat tmp | while read x; do
>     # superblock starts 2 sectors earlier
>     (( x = x - 2 ))
>     
>     echo "Trying superblock at sector $x ..."
>     if dmsetup create foo --table "0 $bogusMax linear /dev/sdb2 $x"; then
>         if e2fsck -n /dev/mapper/foo &>/dev/null; then
>             echo "Found superblock at sector $x ."
>         else
>             echo "FAILED to find superblock at sector $x ."
>         fi
>         dmsetup remove foo
>     else
>         echo "FAILED to dmsetup at sector $x"
>     fi
> done
> ---------------------------------
> 
> 
> Unfortunately, every single superblock offset failed!
> 
> 
> Trying superblock at sector 8521726 ...
> FAILED to find superblock at sector 8521726 .
>     ...
> Trying superblock at sector 98174974 ...
> FAILED to find superblock at sector 98174974 .
> 
> 
> Do I still have hope?!

If I allow e2fsck to prints its error output, this is what I get for each value of the sector:

Trying superblock at sector 8521726 ...
e2fsck 1.41.14 (22-Dec-2010)
e2fsck: Group descriptors look bad... trying backup blocks...
e2fsck: Invalid argument when using the backup blocks
e2fsck: going back to original superblock
Error reading block 3062704254 (Invalid argument).  Ignore error? no

Superblock has an invalid journal (inode 8).
Clear? no

e2fsck: Illegal inode number while checking ext3 journal for /dev/mapper/foo
FAILED to find superblock at sector 8521726 .

   <repeated similarly for each value superblock sector>

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No success repairing my ext4 file system so far, PLEASE HELP! Harry <simonsharry@gmail.com> - 2012-04-12 03:29 -0700
  Re: No success repairing my ext4 file system so far, PLEASE HELP! Richard Kettlewell <rjk@greenend.org.uk> - 2012-04-12 11:46 +0100
    Re: No success repairing my ext4 file system so far, PLEASE HELP! Harry <simonsharry@gmail.com> - 2012-04-12 04:08 -0700
      Re: No success repairing my ext4 file system so far, PLEASE HELP! Richard Kettlewell <rjk@greenend.org.uk> - 2012-04-12 12:36 +0100
        Re: No success repairing my ext4 file system so far, PLEASE HELP! Harry <simonsharry@gmail.com> - 2012-04-12 05:25 -0700
          Re: No success repairing my ext4 file system so far, PLEASE HELP! Richard Kettlewell <rjk@greenend.org.uk> - 2012-04-12 13:49 +0100
            Re: No success repairing my ext4 file system so far, PLEASE HELP! Harry <simonsharry@gmail.com> - 2012-04-12 06:09 -0700
              Re: No success repairing my ext4 file system so far, PLEASE HELP! Richard Kettlewell <rjk@greenend.org.uk> - 2012-04-12 19:18 +0100
                Re: No success repairing my ext4 file system so far, PLEASE HELP! Harry <simonsharry@gmail.com> - 2012-04-12 11:49 -0700
              Re: No success repairing my ext4 file system so far, PLEASE HELP! Doug Freyburger <dfreybur@yahoo.com> - 2012-04-12 18:27 +0000
              Re: No success repairing my ext4 file system so far, PLEASE HELP! Doug Freyburger <dfreybur@yahoo.com> - 2012-04-12 18:51 +0000
                Re: No success repairing my ext4 file system so far, PLEASE HELP! Harry <simonsharry@gmail.com> - 2012-04-12 12:12 -0700
                Re: No success repairing my ext4 file system so far, PLEASE HELP! "David W. Hodgins" <dwhodgins@nomail.afraid.org> - 2012-04-12 17:15 -0400
                Re: No success repairing my ext4 file system so far, PLEASE HELP! Harry <simonsharry@gmail.com> - 2012-04-12 20:30 -0700
                Re: No success repairing my ext4 file system so far, PLEASE HELP! Harry <simonsharry@gmail.com> - 2012-04-13 06:58 -0700
                Re: No success repairing my ext4 file system so far, PLEASE HELP! Harry <simonsharry@gmail.com> - 2012-04-13 07:13 -0700
                Re: No success repairing my ext4 file system so far, PLEASE HELP! Robert Nichols <SEE_SIGNATURE@localhost.localdomain.invalid> - 2012-04-13 19:29 -0500
                Re: No success repairing my ext4 file system so far, PLEASE HELP! Harry <simonsharry@gmail.com> - 2012-04-13 21:27 -0700
                Re: No success repairing my ext4 file system so far, PLEASE HELP! Robert Nichols <SEE_SIGNATURE@localhost.localdomain.invalid> - 2012-04-14 07:58 -0500
                Re: No success repairing my ext4 file system so far, PLEASE HELP! Harry <simonsharry@gmail.com> - 2012-04-14 06:35 -0700
                Re: No success repairing my ext4 file system so far, PLEASE HELP! Robert Nichols <SEE_SIGNATURE@localhost.localdomain.invalid> - 2012-04-14 19:59 -0500
                Re: No success repairing my ext4 file system so far, PLEASE HELP! Harry <simonsharry@gmail.com> - 2012-04-14 19:58 -0700
                Re: No success repairing my ext4 file system so far, PLEASE HELP! Harry <simonsharry@gmail.com> - 2012-04-14 20:13 -0700
                Re: No success repairing my ext4 file system so far, PLEASE HELP! Robert Nichols <SEE_SIGNATURE@localhost.localdomain.invalid> - 2012-04-15 15:14 -0500
                Re: No success repairing my ext4 file system so far, PLEASE HELP! Harry <simonsharry@gmail.com> - 2012-04-16 02:39 -0700
                Re: No success repairing my ext4 file system so far, PLEASE HELP! Robert Nichols <SEE_SIGNATURE@localhost.localdomain.invalid> - 2012-04-16 08:50 -0500
                Re: No success repairing my ext4 file system so far, PLEASE HELP! Harry <simonsharry@gmail.com> - 2012-04-16 08:02 -0700
                Re: No success repairing my ext4 file system so far, PLEASE HELP! Harry <simonsharry@gmail.com> - 2012-04-16 10:39 -0700
                Re: No success repairing my ext4 file system so far, PLEASE HELP! Harry <simonsharry@gmail.com> - 2012-04-16 11:08 -0700
                Re: No success repairing my ext4 file system so far, PLEASE HELP! Robert Nichols <SEE_SIGNATURE@localhost.localdomain.invalid> - 2012-04-16 15:58 -0500
                Re: No success repairing my ext4 file system so far, PLEASE HELP! Harry <simonsharry@gmail.com> - 2012-04-16 23:02 -0700
                Re: No success repairing my ext4 file system so far, PLEASE HELP! Robert Nichols <SEE_SIGNATURE@localhost.localdomain.invalid> - 2012-04-17 10:58 -0500
                Re: No success repairing my ext4 file system so far, PLEASE HELP! Harry <simonsharry@gmail.com> - 2012-04-18 21:53 -0700
                Re: No success repairing my ext4 file system so far, PLEASE HELP! Doug Freyburger <dfreybur@yahoo.com> - 2012-04-19 16:45 +0000
                Re: No success repairing my ext4 file system so far, PLEASE HELP! Harry <simonsharry@gmail.com> - 2012-04-19 18:34 -0700
                Re: No success repairing my ext4 file system so far, PLEASE HELP! Doug Freyburger <dfreybur@yahoo.com> - 2012-04-20 17:19 +0000
                Re: No success repairing my ext4 file system so far, PLEASE HELP! Harry <simonsharry@gmail.com> - 2012-04-21 20:37 -0700
                Re: No success repairing my ext4 file system so far, PLEASE HELP! Doug Freyburger <dfreybur@yahoo.com> - 2012-04-25 16:01 +0000
                Re: No success repairing my ext4 file system so far, PLEASE HELP! Harry <simonsharry@gmail.com> - 2012-04-28 16:32 -0700
                Re: No success repairing my ext4 file system so far, PLEASE HELP! Doug Freyburger <dfreybur@yahoo.com> - 2012-04-16 19:15 +0000
                Re: No success repairing my ext4 file system so far, PLEASE HELP! Harry <simonsharry@gmail.com> - 2012-04-16 21:20 -0700
                Re: No success repairing my ext4 file system so far, PLEASE HELP! Harry <simonsharry@gmail.com> - 2012-04-13 21:40 -0700
                Re: No success repairing my ext4 file system so far, PLEASE HELP! Harry <simonsharry@gmail.com> - 2012-04-13 21:56 -0700
                Re: No success repairing my ext4 file system so far, PLEASE HELP! Doug Freyburger <dfreybur@yahoo.com> - 2012-04-16 18:47 +0000
                Re: No success repairing my ext4 file system so far, PLEASE HELP! Harry <simonsharry@gmail.com> - 2012-04-16 20:19 -0700
                Re: No success repairing my ext4 file system so far, PLEASE HELP! unruh <unruh@invalid.ca> - 2012-04-13 15:22 +0000
                Re: No success repairing my ext4 file system so far, PLEASE HELP! J G Miller <miller@yoyo.ORG> - 2012-04-13 17:13 +0000
                Re: No success repairing my ext4 file system so far, PLEASE HELP! Harry <simonsharry@gmail.com> - 2012-04-13 21:58 -0700
          Re: No success repairing my ext4 file system so far, PLEASE HELP! unruh <unruh@invalid.ca> - 2012-04-12 15:50 +0000
            Re: No success repairing my ext4 file system so far, PLEASE HELP! The Natural Philosopher <tnp@invalid.invalid> - 2012-04-12 21:37 +0100
      Re: No success repairing my ext4 file system so far, PLEASE HELP! unruh <unruh@invalid.ca> - 2012-04-12 15:46 +0000
        Re: No success repairing my ext4 file system so far, PLEASE HELP! Harry <simonsharry@gmail.com> - 2012-04-12 09:35 -0700
          Re: No success repairing my ext4 file system so far, PLEASE HELP! unruh <unruh@invalid.ca> - 2012-04-12 18:57 +0000
  Re: No success repairing my ext4 file system so far, PLEASE HELP! Doug Freyburger <dfreybur@yahoo.com> - 2012-04-12 15:59 +0000
    Re: No success repairing my ext4 file system so far, PLEASE HELP! unruh <unruh@invalid.ca> - 2012-04-12 16:39 +0000
      Re: No success repairing my ext4 file system so far, PLEASE HELP! Harry <simonsharry@gmail.com> - 2012-04-12 09:53 -0700
        Re: No success repairing my ext4 file system so far, PLEASE HELP! unruh <unruh@invalid.ca> - 2012-04-12 19:03 +0000
    Re: No success repairing my ext4 file system so far, PLEASE HELP! Harry <simonsharry@gmail.com> - 2012-04-12 09:48 -0700
      Re: No success repairing my ext4 file system so far, PLEASE HELP! unruh <unruh@invalid.ca> - 2012-04-12 19:07 +0000
    Re: No success repairing my ext4 file system so far, PLEASE HELP! Richard Kettlewell <rjk@greenend.org.uk> - 2012-04-12 18:43 +0100
      Re: No success repairing my ext4 file system so far, PLEASE HELP! Harry <simonsharry@gmail.com> - 2012-04-12 10:55 -0700
      Re: No success repairing my ext4 file system so far, PLEASE HELP! Doug Freyburger <dfreybur@yahoo.com> - 2012-04-12 18:07 +0000
        Re: No success repairing my ext4 file system so far, PLEASE HELP! Richard Kettlewell <rjk@greenend.org.uk> - 2012-04-12 19:20 +0100
          Re: No success repairing my ext4 file system so far, PLEASE HELP! unruh <unruh@invalid.ca> - 2012-04-12 19:11 +0000
            Re: No success repairing my ext4 file system so far, PLEASE HELP! Richard Kettlewell <rjk@greenend.org.uk> - 2012-04-12 20:39 +0100
              Re: No success repairing my ext4 file system so far, PLEASE HELP! Doug Freyburger <dfreybur@yahoo.com> - 2012-04-13 16:50 +0000
                Re: No success repairing my ext4 file system so far, PLEASE HELP! Harry <simonsharry@gmail.com> - 2012-04-13 21:24 -0700
                Re: No success repairing my ext4 file system so far, PLEASE HELP! Doug Freyburger <dfreybur@yahoo.com> - 2012-04-16 19:04 +0000
                Re: No success repairing my ext4 file system so far, PLEASE HELP! Harry <simonsharry@gmail.com> - 2012-04-16 21:44 -0700
                Re: No success repairing my ext4 file system so far, PLEASE HELP! unruh <unruh@invalid.ca> - 2012-04-17 17:18 +0000
                Re: No success repairing my ext4 file system so far, PLEASE HELP! Harry <simonsharry@gmail.com> - 2012-04-17 18:41 -0700
      Re: No success repairing my ext4 file system so far, PLEASE HELP! unruh <unruh@invalid.ca> - 2012-04-12 19:09 +0000
    Re: No success repairing my ext4 file system so far, PLEASE HELP! Harry <simonsharry@gmail.com> - 2012-04-12 10:46 -0700
      Re: No success repairing my ext4 file system so far, PLEASE HELP! unruh <unruh@invalid.ca> - 2012-04-12 19:13 +0000
        Re: No success repairing my ext4 file system so far, PLEASE HELP! Harry <simonsharry@gmail.com> - 2012-04-12 12:21 -0700
          Re: No success repairing my ext4 file system so far, PLEASE HELP! unruh <unruh@invalid.ca> - 2012-04-12 20:12 +0000
  Re: No success repairing my ext4 file system so far, PLEASE HELP! g.fink@gmx.net (Gernot Fink) - 2012-04-12 18:20 +0000
  Re: No success repairing my ext4 file system so far, PLEASE HELP! The Natural Philosopher <tnp@invalid.invalid> - 2012-04-12 21:35 +0100
  Re: No success repairing my ext4 file system so far, PLEASE HELP! Harry <simonsharry@gmail.com> - 2012-04-19 06:43 -0700
    Re: No success repairing my ext4 file system so far, PLEASE HELP! Bob <SEE_SIGNATURE@localhost.localdomain.invalid> - 2012-04-19 11:29 -0500
      Re: No success repairing my ext4 file system so far, PLEASE HELP! Harry <simonsharry@gmail.com> - 2012-04-19 18:50 -0700

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