Commit 0d99519e authored by Wu Fengguang's avatar Wu Fengguang Committed by Jens Axboe
Browse files

writeback: remove unused nonblocking and congestion checks 



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

So remove the congestion checks as suggested by Chris.

Signed-off-by: default avatarWu Fengguang <fengguang.wu@intel.com>
Cc: Chris Mason <chris.mason@oracle.com>
Cc: Jens Axboe <jens.axboe@oracle.com>
Cc: Trond Myklebust <Trond.Myklebust@netapp.com>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Dave Chinner <david@fromorbit.com>
Cc: Evgeniy Polyakov <zbr@ioremap.net>
Cc: Alex Elder <aelder@sgi.com>
Signed-off-by: default avatarJens Axboe <jens.axboe@oracle.com>
parent b17621fe

drivers/staging/pohmelfs/inode.c

+0 −10
Original line number Diff line number Diff line
@@ -143,7 +143,6 @@ static int pohmelfs_writepages(struct address_space *mapping, struct writeback_c 
	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 address_space *mapping, struct writeback_c 
	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:

fs/fs-writeback.c

+0 −9
Original line number Diff line number Diff line
@@ -639,14 +639,6 @@ static void writeback_inodes_wb(struct bdi_writeback *wb, 
			continue;

		}



		if (wbc->nonblocking && bdi_write_congested(wb->bdi)) {

			wbc->encountered_congestion = 1;

			if (!is_blkdev_sb)

				break;		/* Skip a congested fs */

			requeue_io(inode);

			continue;		/* Skip a congested blockdev */

		}



		/*

		 * Was this inode dirtied after sync_sb_inodes was called?

		 * This keeps sync from extra jobs and livelock.
@@ -770,7 +762,6 @@ static long wb_writeback(struct bdi_writeback *wb, 
			break;



		wbc.more_io = 0;

		wbc.encountered_congestion = 0;

		wbc.nr_to_write = MAX_WRITEBACK_PAGES;

		wbc.pages_skipped = 0;

		writeback_inodes_wb(wb, &wbc);

fs/xfs/linux-2.6/xfs_aops.c

+1 −8
Original line number Diff line number Diff line
@@ -904,17 +904,10 @@ xfs_convert_page( 


	if (startio) {

		if (count) {

			struct backing_dev_info *bdi;



			bdi = inode->i_mapping->backing_dev_info;

			wbc->nr_to_write--;

			if (bdi_write_congested(bdi)) {

				wbc->encountered_congestion = 1;

				done = 1;

			} else if (wbc->nr_to_write <= 0) {

			if (wbc->nr_to_write <= 0)

				done = 1;

		}

		}

		xfs_start_page_writeback(page, !page_dirty, count);

	}

mm/page-writeback.c

+0 −12
Original line number Diff line number Diff line
@@ -821,7 +821,6 @@ int write_cache_pages(struct address_space *mapping, 
		      struct writeback_control *wbc, writepage_t writepage,

		      void *data)

{

	struct backing_dev_info *bdi = mapping->backing_dev_info;

	int ret = 0;

	int done = 0;

	struct pagevec pvec;
@@ -834,11 +833,6 @@ int write_cache_pages(struct address_space *mapping, 
	int range_whole = 0;

	long nr_to_write = wbc->nr_to_write;



	if (wbc->nonblocking && bdi_write_congested(bdi)) {

		wbc->encountered_congestion = 1;

		return 0;

	}



	pagevec_init(&pvec, 0);

	if (wbc->range_cyclic) {

		writeback_index = mapping->writeback_index; /* prev offset */
@@ -957,12 +951,6 @@ continue_unlock: 
					break;

				}

			}



			if (wbc->nonblocking && bdi_write_congested(bdi)) {

				wbc->encountered_congestion = 1;

				done = 1;

				break;

			}

		}

		pagevec_release(&pvec);

		cond_resched();

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