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: [email protected]
ReportedBy: [email protected]
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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[Bug 12533] with extents, ext4 block count wrong
http://bugzilla.kernel.org/show_bug.cgi?id=12533
[email protected] changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |REJECTED
Resolution| |INVALID------- Comment #1 from [email protected] 2009-01-24 19:48 ------- never mind. This is probably the way it's supposed to be.
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[Bug 12533] with extents, ext4 block count wrong
In reply to [email protected]http://bugzilla.kernel.org/show_bug.cgi?id=12533
------- Comment #2 from [email protected] 2009-01-24 21:38 -------
Yup. I suggest that you use debugfs, and that you look at some valid
filesystems before you start filing more bugs in the future....
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