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Re: Corrupt xfs on USB HDD : sub-optimal xfs_repair

To: xfs@xxxxxxxxxxx
Subject: Re: Corrupt xfs on USB HDD : sub-optimal xfs_repair
From: Eric Sandeen <sandeen@xxxxxxxxxxx>
Date: Tue, 03 Apr 2012 11:39:07 -0700
Cc: Dave B <xfs_bugs@xxxxxxxxx>
In-reply-to: <4F79591C.6090508@xxxxxxxxx>
References: <4F79591C.6090508@xxxxxxxxx>
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.6; rv:11.0) Gecko/20120327 Thunderbird/11.0.1
On 4/2/12 12:45 AM, Dave B wrote:
> 
> Hi,
> 
> The two files in the root directory of a 500GB external USB HDD  became 
> corrupt,
> probably due to a power failure.
> 
> dave@K-Matrix $ ls -l /media/Galaxy/
> ls: cannot access /media/Galaxy/ChnSchld_pre_4-14.tgz: No such file or 
> directory
> ls: cannot access /media/Galaxy/dhr820xu.ext: No such file or directory
> total 24
> ??????????   ? ?    ?        ?                ? ChnSchld_pre_4-14.tgz
> ??????????   ? ?    ?        ?                ? dhr820xu.ext
> drwxr-xr-x   7 dave dave  4096 2012-02-13 12:45 DHR recordings
> drwxr-xr-x 212 dave dave 12288 2008-11-30 00:21 Miles Davis
> drwxr-xr-x   5 dave dave  4096 2012-02-16 06:06 PartImage
> 
> 
> xfs_repair didn't help much; it just removed the two filenames.
> At minimum, I expected two entries in L+F but the L+F directory was not 
> created.
> 
> dave@K-Matrix $ sudo xfs_repair /dev/sdc1
> Phase 1 - find and verify superblock...
> Phase 2 - using internal log
>         - zero log...
>         - scan filesystem freespace and inode maps...
>         - found root inode chunk
> Phase 3 - for each AG...
>         - scan and clear agi unlinked lists...
>         - process known inodes and perform inode discovery...
>         - agno = 0
>         - agno = 1
>         - agno = 2
>         - agno = 3
>         - process newly discovered inodes...
> Phase 4 - check for duplicate blocks...
>         - setting up duplicate extent list...
>         - check for inodes claiming duplicate blocks...
>         - agno = 0
> entry "ChnSchld_pre_4-14.tgz" in shortform directory 128 references free 
> inode 48145461
> junking entry "ChnSchld_pre_4-14.tgz" in directory inode 128
> entry "dhr820xu.ext" in shortform directory 128 references free inode 48145451
> junking entry "dhr820xu.ext" in directory inode 128
>         - agno = 1
>         - agno = 2
>         - agno = 3
> Phase 5 - rebuild AG headers and trees...
>         - reset superblock...
> Phase 6 - check inode connectivity...
>         - resetting contents of realtime bitmap and summary inodes
>         - traversing filesystem ...
>         - traversal finished ...
>         - moving disconnected inodes to lost+found ...
> Phase 7 - verify and correct link counts...
> done
> 
> 
> See longer console session and before/after metadumps in ~7MB d/l at:
> http://daxxi.net/xfs/Galaxy_500GB_xfs.tar.gz
> user: xfs  ,  p/w: xfs
> (please only d/l if 2x240MB metadumps will be meaningful to you)
> 
> 
> Environment:
> Linux K-Matrix 3.0.0-16-generic #29-Ubuntu SMP Tue Feb 14 12:49:42 UTC 2012 
> i686 athlon i386 GNU/Linux

Thanks, I'll take a look at this, grabbing the images now.

-Eric
> 
> Dave
> 
> 
> 
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