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Commit 6a290544 authored by Chao Yu's avatar Chao Yu Committed by Jaegeuk Kim
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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: default avatarChao Yu <chao2.yu@samsung.com>
Signed-off-by: default avatarJaegeuk Kim <jaegeuk@kernel.org>
parent 737f1899

fs/f2fs/data.c

+4 −0
Original line number Original line Diff line number Diff line
@@ -1275,6 +1275,10 @@ static int f2fs_write_data_pages(struct address_space *mapping, 
	if (!mapping->a_ops->writepage)

	if (!mapping->a_ops->writepage)

		return 0;

		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 &&

	if (S_ISDIR(inode->i_mode) && wbc->sync_mode == WB_SYNC_NONE &&

			get_dirty_pages(inode) < nr_pages_to_skip(sbi, DATA) &&

			get_dirty_pages(inode) < nr_pages_to_skip(sbi, DATA) &&

			available_free_memory(sbi, DIRTY_DENTS))

			available_free_memory(sbi, DIRTY_DENTS))