f2fs: optimize get node page readahead part

We can remove the call to find_get_page to get a page from the cache
and check for up-to-date, instead we can make use of grab_cache_page
part itself to fetch the page from the cache.
So, removing the call and moving the PageUptodate at proper place, also
taken care of moving the lock_page condition in the page_hit part.

Signed-off-by: Namjae Jeon <namjae.jeon@samsung.com>
Signed-off-by: Amit Sahrawat <a.sahrawat@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>

diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
index d408e69..58f7216 100644 (file)
--- a/fs/f2fs/node.c
+++ b/fs/f2fs/node.c
@@ -921,19 +921,17 @@ struct page *get_node_page_ra(struct page *parent, int start)
        if (!nid)
                return ERR_PTR(-ENOENT);
 
-       page = find_get_page(mapping, nid);
-       if (page && PageUptodate(page))
-               goto page_hit;
-       f2fs_put_page(page, 0);
-
 repeat:
        page = grab_cache_page(mapping, nid);
        if (!page)
                return ERR_PTR(-ENOMEM);
+       else if (PageUptodate(page))
+               goto page_hit;
 
        err = read_node_page(page, READ_SYNC);
+       unlock_page(page);
        if (err) {
-               f2fs_put_page(page, 1);
+               f2fs_put_page(page, 0);
                return ERR_PTR(err);
        }
 
@@ -947,8 +945,9 @@ repeat:
                ra_node_page(sbi, nid);
        }
 
-page_hit:
        lock_page(page);
+
+page_hit:
        if (PageError(page)) {
                f2fs_put_page(page, 1);
                return ERR_PTR(-EIO);