From: bugme-daemon@bugzilla.kernel.org
Subject: [Bug 12534] New: ext4 extent structure backwards
Date: Sat, 24 Jan 2009 01:31:39 -0800 (PST)
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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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