linux-kernel - Re: [PATCH 03/12] writeback: remove unused nonblocking and congestion checks (pohmelfs)

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Date:	Thu, 19 Nov 2009 16:11:54 +0800
From:	Wu Fengguang <fengguang.wu@...el.com>
To:	Evgeniy Polyakov <zbr@...emap.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jens Axboe <jens.axboe@...cle.com>
Cc:	"linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 03/12] writeback: remove unused nonblocking and
	congestion checks (pohmelfs)

Hi Evgeniy,

Will you pick up this updated patch? It also removes the unused bdi.

Thanks,
Fengguang
---
writeback: remove unused nonblocking and congestion checks (pohmelfs)

No one is calling wb_writeback and write_cache_pages with
wbc.nonblocking=1 any more. And lumpy pageout will want to do
nonblocking writeback without the congestion wait.

CC: Evgeniy Polyakov <zbr@...emap.net>
Signed-off-by: Wu Fengguang <fengguang.wu@...el.com>
---
 drivers/staging/pohmelfs/inode.c |   10 ----------
 1 file changed, 10 deletions(-)

--- linux.orig/drivers/staging/pohmelfs/inode.c	2009-11-18 16:39:36.000000000 +0800
+++ linux/drivers/staging/pohmelfs/inode.c	2009-11-19 16:10:29.000000000 +0800
@@ -143,7 +143,6 @@ static int pohmelfs_writepages(struct ad
 	struct inode *inode = mapping->host;
 	struct pohmelfs_inode *pi = POHMELFS_I(inode);
 	struct pohmelfs_sb *psb = POHMELFS_SB(inode->i_sb);
-	struct backing_dev_info *bdi = mapping->backing_dev_info;
 	int err = 0;
 	int done = 0;
 	int nr_pages;
@@ -152,11 +151,6 @@ static int pohmelfs_writepages(struct ad
 	int scanned = 0;
 	int range_whole = 0;
 
-	if (wbc->nonblocking && bdi_write_congested(bdi)) {
-		wbc->encountered_congestion = 1;
-		return 0;
-	}
-
 	if (wbc->range_cyclic) {
 		index = mapping->writeback_index; /* Start from prev offset */
 		end = -1;
@@ -248,10 +242,6 @@ retry:
 
 			if (wbc->nr_to_write <= 0)
 				done = 1;
-			if (wbc->nonblocking && bdi_write_congested(bdi)) {
-				wbc->encountered_congestion = 1;
-				done = 1;
-			}
 
 			continue;
 out_continue:
--
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