On Wed, 14 Feb 2001, NIIBE Yutaka wrote:
> Alan Cox wrote:
> > Ok we need to handle that case a bit more intelligently so those flushes dont
> > get into other ports code paths.
>
> Possibly at fs/buffer.c:end_buffer_io_async?
>
> We need to flush the cache when I/O was READ or READA.
Yet another thing (1) on end_buffer_io_async() to handle a case which is
only true for a specific user of it. Since the other special case handling
is for swap IO too, I think a separate IO end operation for swap would be
interesting.
(1) The current one is SetPageDecrAfter handling.
> Is there any way for end_buffer_io_async to distinguish which I/O (READ or WRITE)
> has been done?
Yes. If the buffer_head is uptodated (BH_Uptodate) then its a WRITE,
otherwise its a READ (this is only true before mark_buffer_uptodate() call
inside end_buffer_io_async(), of course).
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