From: bugme-daemon@bugzilla.kernel.org
Subject: [Bug 12533] New: with extents, ext4 block count wrong
Date: Sat, 24 Jan 2009 01:18:52 -0800 (PST)
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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@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
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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