From 15291164b22a357cb211b618adfef4fa82fc0de3 Mon Sep 17 00:00:00 2001 From: Eric Sandeen Date: Mon, 20 Feb 2012 17:53:01 -0500 Subject: [PATCH] jbd2: clear BH_Delay & BH_Unwritten in journal_unmap_buffer 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 discard_buffer() does. 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 Signed-off-by: "Theodore Ts'o" Cc: stable@vger.kernel.org --- fs/jbd2/transaction.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/fs/jbd2/transaction.c b/fs/jbd2/transaction.c index 35ae096bed5d..526533062548 100644 --- a/fs/jbd2/transaction.c +++ b/fs/jbd2/transaction.c @@ -1949,6 +1949,8 @@ static int journal_unmap_buffer(journal_t *journal, struct buffer_head *bh) clear_buffer_mapped(bh); clear_buffer_req(bh); clear_buffer_new(bh); + clear_buffer_delay(bh); + clear_buffer_unwritten(bh); bh->b_bdev = NULL; return may_free; } -- GitLab