From 6a2905443cf27f9c14889428f14fccfb98ed97f4 Mon Sep 17 00:00:00 2001 From: Chao Yu Date: Fri, 17 Jul 2015 18:02:39 +0800 Subject: [PATCH] f2fs: skip writing in ->writepages when no dirty pages exist When flushing comes from background, if there is no dirty page in the mapping of inode, we'd better to skip seeking dirty page from mapping for writebacking. Signed-off-by: Chao Yu Signed-off-by: Jaegeuk Kim --- fs/f2fs/data.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c index 801b0b0b08f4..e4081fc91012 100644 --- a/fs/f2fs/data.c +++ b/fs/f2fs/data.c @@ -1275,6 +1275,10 @@ static int f2fs_write_data_pages(struct address_space *mapping, if (!mapping->a_ops->writepage) return 0; + /* skip writing if there is no dirty page in this inode */ + if (!get_dirty_pages(inode) && wbc->sync_mode == WB_SYNC_NONE) + return 0; + if (S_ISDIR(inode->i_mode) && wbc->sync_mode == WB_SYNC_NONE && get_dirty_pages(inode) < nr_pages_to_skip(sbi, DATA) && available_free_memory(sbi, DIRTY_DENTS)) -- 2.39.2