Commit 9c471105 authored by Zhihao Cheng's avatar Zhihao Cheng
Browse files

iomap: improve iomap_folio_mkwrite_iter and ifs_clear_range_dirty 

hulk inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I9DN5Z


CVE: NA

--------------------------------

Improve ifs_clear_range_dirty() by using shift operating. Improve
iomap_folio_mkwrite_iter() by making folio dirty once.

Signed-off-by: default avatarZhihao Cheng <chengzhihao1@huawei.com>
Signed-off-by: default avatarZhihao Cheng <chengzhihao@huaweicloud.com>
parent a4f7f98e

fs/iomap/buffered-io.c

+4 −2
Original line number Diff line number Diff line
@@ -136,7 +136,8 @@ static void ifs_clear_range_dirty(struct folio *folio, 
{

	struct inode *inode = folio->mapping->host;

	unsigned int blks_per_folio = i_blocks_per_folio(inode, folio);

	unsigned int first_blk = DIV_ROUND_UP(off, i_blocksize(inode));

	unsigned int first_blk = round_up(off, i_blocksize(inode)) >>

				 inode->i_blkbits;

	unsigned int last_blk = (off + len) >> inode->i_blkbits;

	unsigned int nr_blks = last_blk - first_blk;

	unsigned long flags;
@@ -1559,7 +1560,6 @@ static loff_t iomap_folio_mkwrite_iter(struct iomap_iter *iter, 


		ifs_alloc(iter->inode, folio, 0);

		iomap_set_range_dirty(folio, 0, length);

		filemap_dirty_folio(iter->inode->i_mapping, folio);

	}



	return length;
@@ -1583,6 +1583,8 @@ vm_fault_t iomap_page_mkwrite(struct vm_fault *vmf, const struct iomap_ops *ops) 
	while ((ret = iomap_iter(&iter, ops)) > 0)

		iter.processed = iomap_folio_mkwrite_iter(&iter, folio);



	if (iter.pos > folio_pos(folio))

		filemap_dirty_folio(folio->mapping, folio);

	if (ret < 0)

		goto out_unlock;

	folio_wait_stable(folio);