[Ocfs2-devel] [PATCH] ocfs2: fix data corruption after failed write

[Greg KH]

On Tue, Mar 21, 2023 at 11:20:24AM +0800, Joseph Qi wrote:
> From: Jan Kara via Ocfs2-devel <ocfs2-devel at oss.oracle.com>
> 
> commit 90410bcf873cf05f54a32183afff0161f44f9715 upstream.
> 
> When buffered write fails to copy data into underlying page cache page,
> ocfs2_write_end_nolock() just zeroes out and dirties the page.  This can
> leave dirty page beyond EOF and if page writeback tries to write this page
> before write succeeds and expands i_size, page gets into inconsistent
> state where page dirty bit is clear but buffer dirty bits stay set
> resulting in page data never getting written and so data copied to the
> page is lost.  Fix the problem by invalidating page beyond EOF after
> failed write.
> 
> Link: https://lkml.kernel.org/r/20230302153843.18499-1-jack@suse.cz
> Fixes: 6dbf7bb55598 ("fs: Don't invalidate page buffers in block_write_full_page()")
> Signed-off-by: Jan Kara <jack at suse.cz>
> Reviewed-by: Joseph Qi <joseph.qi at linux.alibaba.com>
> Cc: Mark Fasheh <mark at fasheh.com>
> Cc: Joel Becker <jlbec at evilplan.org>
> Cc: Junxiao Bi <junxiao.bi at oracle.com>
> Cc: Changwei Ge <gechangwei at live.cn>
> Cc: Gang He <ghe at suse.com>
> Cc: Jun Piao <piaojun at huawei.com>
> Cc: <stable at vger.kernel.org>
> Signed-off-by: Andrew Morton <akpm at linux-foundation.org>
> [ replace block_invalidate_folio to block_invalidatepage ]
> Signed-off-by: Joseph Qi <joseph.qi at linux.alibaba.com>
> ---
>  fs/ocfs2/aops.c | 18 ++++++++++++++++--
>  1 file changed, 16 insertions(+), 2 deletions(-)
> 

Now queued up, thanks.

greg k-h