[PATCH] use WRITE_FLUSH instead of REQ_FLUSH

[PATCH] use WRITE_FLUSH instead of REQ_FLUSH

[Mikulas Patocka]

Hi Alasdair

Please push this patch to 3.8 kernel. (I already sent it before, but it 
was forgotten somehow).

Mikulas

---

dm-bufio: use WRITE_FLUSH instead of REQ_FLUSH

Use WRITE_FLUSH instead of REQ_FLUSH to make it consistent with the rest
of the kernel. There is no functional change - the kernel accepts either
WRITE_FLUSH or REQ_FLUSH.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>

---
 drivers/md/dm-bufio.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Index: linux-3.7-rc6/drivers/md/dm-bufio.c
===================================================================
--- linux-3.7-rc6.orig/drivers/md/dm-bufio.c	2012-11-17 21:14:01.000000000 +0100
+++ linux-3.7-rc6/drivers/md/dm-bufio.c	2012-11-17 21:29:50.000000000 +0100
@@ -1193,7 +1193,7 @@ EXPORT_SYMBOL_GPL(dm_bufio_write_dirty_b
 int dm_bufio_issue_flush(struct dm_bufio_client *c)
 {
 	struct dm_io_request io_req = {
-		.bi_rw = REQ_FLUSH,
+		.bi_rw = WRITE_FLUSH,
 		.mem.type = DM_IO_KMEM,
 		.mem.ptr.addr = NULL,
 		.client = c->dm_io,

Re: use WRITE_FLUSH instead of REQ_FLUSH

[Mike Snitzer]

On Mon, Jan 07 2013 at 12:12am -0500,
Mikulas Patocka <mpatocka@redhat.com> wrote:

> Hi Alasdair
> 
> Please push this patch to 3.8 kernel. (I already sent it before, but it 
> was forgotten somehow).
> 
> Mikulas
> 
> ---
> 
> dm-bufio: use WRITE_FLUSH instead of REQ_FLUSH
> 
> Use WRITE_FLUSH instead of REQ_FLUSH to make it consistent with the rest
> of the kernel. There is no functional change - the kernel accepts either
> WRITE_FLUSH or REQ_FLUSH.

Well the important distinction is the flush bio is originating in
dm-bufio whereas other DM targets that test for REQ_FLUSH are just
passing the flush through.  Saying as much makes the need for this patch
more explicit.