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Commit 7107e0a9 authored by Jaegeuk Kim's avatar Jaegeuk Kim
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f2fs: merge read IOs at ra_nat_pages() 



Change log from v1:
  o add mark_page_accessed() not to reclaim the nat pages.

This patch changes the policy of submitting read bios at ra_nat_pages.

Previously, f2fs submits small read bios with block plugging.
But, with this patch, f2fs itself merges read bios first and then submits a
large bio, which can reduce the bio handling overheads.

Signed-off-by: default avatarJaegeuk Kim <jaegeuk.kim@samsung.com>
parent 924b720b

fs/f2fs/node.c

+4 −7
Original line number Diff line number Diff line
@@ -89,13 +89,10 @@ static void ra_nat_pages(struct f2fs_sb_info *sbi, int nid) 
{

	struct address_space *mapping = sbi->meta_inode->i_mapping;

	struct f2fs_nm_info *nm_i = NM_I(sbi);

	struct blk_plug plug;

	struct page *page;

	pgoff_t index;

	int i;



	blk_start_plug(&plug);



	for (i = 0; i < FREE_NID_PAGES; i++, nid += NAT_ENTRY_PER_BLOCK) {

		if (nid >= nm_i->max_nid)

			nid = 0;
@@ -105,15 +102,15 @@ static void ra_nat_pages(struct f2fs_sb_info *sbi, int nid) 
		if (!page)

			continue;

		if (PageUptodate(page)) {

			mark_page_accessed(page);

			f2fs_put_page(page, 1);

			continue;

		}

		if (f2fs_readpage(sbi, page, index, READ))

			continue;



		submit_read_page(sbi, page, index, READ_SYNC);

		mark_page_accessed(page);

		f2fs_put_page(page, 0);

	}

	blk_finish_plug(&plug);

	f2fs_submit_read_bio(sbi, READ_SYNC);

}



static struct nat_entry *__lookup_nat_cache(struct f2fs_nm_info *nm_i, nid_t n)