On Thu, Jan 07, 2021 at 03:47:09PM +0100, Jan Kara wrote:

I think attached patch (compile-tested only) should actually fix the
problem as well without this special ->dirty_inode() call. It basically
only moves the mark_inode_dirty_sync() before inode->i_state clearing.
Because conceptually mark_inode_dirty_sync() is IMO the right function to
call. It will take care of clearing I_DIRTY_TIME flag (because we are
setting I_DIRTY_SYNC), it will also not touch inode->i_io_list if the inode
is queued for sync (I_SYNC_QUEUED is set in that case). The only problem
with calling it was that it was called *after* clearing dirty bits from
i_state... What do you think?

I like this patch far more, fwiw.