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Date:   Mon, 24 Aug 2020 17:51:43 +0200
From:   Jan Kara <>
To:     Ye Bin <>
Subject: Re: [PATCH 0/2] Fix race between do_invalidatepage and


On Sat 22-08-20 16:22:16, Ye Bin wrote:
> Ye Bin (2):
>   ext4: Add comment to BUFFER_FLAGS_DISCARD for search code
>   jbd2: Fix race between do_invalidatepage and init_page_buffers
>  fs/buffer.c                 | 12 +++++++++++-
>  fs/jbd2/journal.c           |  7 +++++++
>  include/linux/buffer_head.h |  2 ++
>  3 files changed, 20 insertions(+), 1 deletion(-)

Thanks for the good description of the problem and the analysis. I could
now easily understand what was really happening on your system. I think the
problem should be fixed differently through - it is a problem of
block_write_full_page() that it invalidates buffers while JBD2 is working
with them. Attached patch should also fix the problem. Can you please test
whether it fixes your testcase as well? Thanks!

Jan Kara <>

View attachment "0001-fs-Don-t-invalidate-page-buffers-in-block_write_full.patch" of type "text/x-patch" (3893 bytes)

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