[ 136/175] jbd2: clear BH_Delay & BH_Unwritten in journal_unmap_buffer
From: Greg KH
Date: Fri Mar 30 2012 - 17:43:23 EST
3.3-stable review patch. If anyone has any objections, please let me know.
From: Eric Sandeen <sandeen@xxxxxxxxxx>
commit 15291164b22a357cb211b618adfef4fa82fc0de3 upstream.
journal_unmap_buffer()'s zap_buffer: code clears a lot of buffer head
state ala discard_buffer(), but does not touch _Delay or _Unwritten as
This can be problematic in some areas of the ext4 code which assume
that if they have found a buffer marked unwritten or delay, then it's
a live one. Perhaps those spots should check whether it is mapped
as well, but if jbd2 is going to tear down a buffer, let's really
tear it down completely.
Without this I get some fsx failures on sub-page-block filesystems
up until v3.2, at which point 4e96b2dbbf1d7e81f22047a50f862555a6cb87cb
and 189e868fa8fdca702eb9db9d8afc46b5cb9144c9 make the failures go
away, because buried within that large change is some more flag
clearing. I still think it's worth doing in jbd2, since
->invalidatepage leads here directly, and it's the right place
to clear away these flags.
Signed-off-by: Eric Sandeen <sandeen@xxxxxxxxxx>
Signed-off-by: "Theodore Ts'o" <tytso@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
fs/jbd2/transaction.c | 2 ++
1 file changed, 2 insertions(+)
@@ -1949,6 +1949,8 @@ zap_buffer_unlocked:
bh->b_bdev = NULL;
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