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Subject[PATCH 0/4] ext3/jbd: possible filesystem corruption fixes (take 3)
This patch set is the take 3 of fixing error handling problem in
ext3/JBD. The previous discussion can be found here:
http://kerneltrap.org/mailarchive/linux-kernel/2008/6/2/2002094

Problem
=======
Currently some error checkings are missing, so the journal cannot abort
correctly. This can cause a filesystem corruption. Missing error
checkings are:

(1) error check for the metadata writes to the journal before the
commit (addressed by PATCH 1/4)
(2) error check for checkpointing and replay (addressed by PATCH 2/4
and 3/4)

PATCH 2/4 makes another problem worse; replaying old journaled
metadata can overwrite the latest metadata on the filesystem and
break its consistency. This is fixed by PATCH 4/4.


Changes since Take 2
====================
[PATCH x/x]
o file data error handling fixes were separated to other patch set

[PATCH 3/4]
o fix return value handlings (trivial)

[PATCH 4/4]
o newly added to prevent unjournaled metadata buffers from being
written to the filesystem on abort

Regards,
--
Hidehiro Kawai
Hitachi, Systems Development Laboratory
Linux Technology Center




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