commit 7ad7445f60fe4d46c4c9d2a9463db180d2a3b270
author Hidehiro Kawai <hidehiro.kawai.ez@hitachi.com> Fri Oct 10 20:29:31 2008 -0400
committer Theodore Ts'o <tytso@mit.edu> Fri Oct 10 20:29:31 2008 -0400
tree cd4e0f69f90664e5ca4185271fbacbb7b4f59491
parent 7ffe1ea8949c75ecffb7a4d988bb881a9fa62fbe

jbd2: don't dirty original metadata buffer on abort

Currently, original metadata buffers are dirtied when they are
unfiled whether the journal has aborted or not.  Eventually these
buffers will be written-back to the filesystem by pdflush.  This
means some metadata buffers are written to the filesystem without
journaling if the journal aborts.  So if both journal abort and
system crash happen at the same time, the filesystem would become
inconsistent state.  Additionally, replaying journaled metadata
can overwrite the latest metadata on the filesystem partly.
Because, if the journal gets aborted, journaled metadata are
preserved and replayed during the next mount not to lose
uncheckpointed metadata.  This would also break the consistency
of the filesystem.

This patch prevents original metadata buffers from being dirtied
on abort by clearing BH_JBDDirty flag from those buffers.  Thus,
no metadata buffers are written to the filesystem without journaling.

Signed-off-by: Hidehiro Kawai <hidehiro.kawai.ez@hitachi.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>