linux-ext4 - [Bug 12533] New: with extents, ext4 block count wrong

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Message-Id: <bug-12533-13602@http.bugzilla.kernel.org/>
Date:	Sat, 24 Jan 2009 01:18:52 -0800 (PST)
From:	bugme-daemon@...zilla.kernel.org
To:	linux-ext4@...r.kernel.org
Subject: [Bug 12533] New: with extents, ext4 block count wrong

http://bugzilla.kernel.org/show_bug.cgi?id=12533

           Summary: with extents, ext4 block count wrong
           Product: File System
           Version: 2.5
     KernelVersion: 2.6.28
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: ext4
        AssignedTo: fs_ext4@...nel-bugs.osdl.org
        ReportedBy: markus@...wisc.edu


Latest working kernel version: 2.6.28
Earliest failing kernel version: 2.6.28
Distribution: Gentoo
Hardware Environment: i686
Block size: 4096

I'm trying to recover from a massive data loss with ext4 (root directory
erased), so I'm looking at lots of hexedit output.  Here's one thing that looks
quite wrong:

ED 41 E8 03  00 10 00 00  16 81 73 49  16 81 73 49
16 81 73 49  00 00 00 00  E8 03 03 00  08 00 00 00
00 00 08 00  02 00 00 00  0A F3 01 00  04 00 00 00
00 00 00 00  00 00 00 00  01 00 00 00  3E 17 13 00
00 00 00 00  00 00 00 00  00 00 00 00  00 00 00 00
00 00 00 00  00 00 00 00  00 00 00 00  00 00 00 00
00 00 00 00  61 27 09 0B  00 00 00 00  00 00 00 00
00 00 00 00  00 00 00 00  00 00 00 00  00 00 00 00

The 4 in the second byte indicates this is a directory.  The second word says
the file size is 4096 bytes, the same as the block size.  The eight word says
there are eight blocks.  Last, the extent header has one extent (second half of
the 11th word), and this one extent has a block count of 1 (first half of 15th
word).

The directory contains a single directory.


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