From 0d99519efef15fd0cf84a849492c7b1deee1e4b7 Mon Sep 17 00:00:00 2001 From: Wu Fengguang Date: Thu, 3 Dec 2009 13:54:25 +0100 Subject: [PATCH] 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: Wu Fengguang Cc: Chris Mason Cc: Jens Axboe Cc: Trond Myklebust Cc: Christoph Hellwig Cc: Dave Chinner Cc: Evgeniy Polyakov Cc: Alex Elder Signed-off-by: Jens Axboe --- drivers/staging/pohmelfs/inode.c | 10 ---------- fs/fs-writeback.c | 9 --------- fs/xfs/linux-2.6/xfs_aops.c | 9 +-------- mm/page-writeback.c | 12 ------------ 4 files changed, 1 insertion(+), 39 deletions(-) diff --git a/drivers/staging/pohmelfs/inode.c b/drivers/staging/pohmelfs/inode.c index c94de313922..f69b7783027 100644 --- a/drivers/staging/pohmelfs/inode.c +++ b/drivers/staging/pohmelfs/inode.c @@ -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: diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c index 0793961f769..49bc1b8e8f1 100644 --- a/fs/fs-writeback.c +++ b/fs/fs-writeback.c @@ -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); diff --git a/fs/xfs/linux-2.6/xfs_aops.c b/fs/xfs/linux-2.6/xfs_aops.c index c2e30eea74d..70f989895d1 100644 --- a/fs/xfs/linux-2.6/xfs_aops.c +++ b/fs/xfs/linux-2.6/xfs_aops.c @@ -904,16 +904,9 @@ 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); } diff --git a/mm/page-writeback.c b/mm/page-writeback.c index 2c5d79236ea..0b19943ecf8 100644 --- a/mm/page-writeback.c +++ b/mm/page-writeback.c @@ -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(); -- 2.41.0