From: Chao Yu <yuch...@huawei.com> This patch changes to detect synchronous writeback more earlier before, in order to avoid unnecessary page writeback before exiting asynchronous writeback.
Signed-off-by: Chao Yu <yuch...@huawei.com> --- fs/f2fs/data.c | 11 ++++++++--- 1 file changed, 8 insertions(+), 3 deletions(-) diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c index feb4c224b305..91cbf20b448a 100644 --- a/fs/f2fs/data.c +++ b/fs/f2fs/data.c @@ -1919,6 +1919,13 @@ static int f2fs_write_cache_pages(struct address_space *mapping, struct page *page = pvec.pages[i]; bool submitted = false; + /* give a priority to WB_SYNC threads */ + if (atomic_read(&F2FS_M_SB(mapping)->wb_sync_req) && + wbc->sync_mode == WB_SYNC_NONE) { + done = 1; + break; + } + done_index = page->index; retry_write: lock_page(page); @@ -1973,9 +1980,7 @@ static int f2fs_write_cache_pages(struct address_space *mapping, last_idx = page->index; } - /* give a priority to WB_SYNC threads */ - if ((atomic_read(&F2FS_M_SB(mapping)->wb_sync_req) || - --wbc->nr_to_write <= 0) && + if (--wbc->nr_to_write <= 0 && wbc->sync_mode == WB_SYNC_NONE) { done = 1; break; -- 2.16.2.17.g38e79b1fd