[Bug 12534] New: ext4 extent structure backwards

[bugme-daemon@bugzilla.kernel.org]

http://bugzilla.kernel.org/show_bug.cgi?id=12534

           Summary: ext4 extent structure backwards
           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@kernel-bugs.osdl.org
        ReportedBy: markus@cs.wisc.edu


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

I was figuring out ext4 with hexedit (don't ask), and I noticed that the extent
structure is backwards.  It's defined in ext4_extents.h with this order:

block(32-bit), len(16), start_hi(16), start_lo(32)

Here's what I see (including 12 byte header):

0A F3 01 00  04 00 00 00  00 00 00 00
00 00 00 00  01 00 00 00  3E 17 13 00
(another 36 bytes of zeros)

You can see that the block is 0x13173e, len is 1, and start is 0.  (The
header's just fine, and only says that there is 1 extent and there can be no
more than 4 extents.)


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