[PATCH 13/19] f2fs: fix return value of releasepage for node and data

[Jaegeuk Kim <jaegeuk.kim@xxxxxxxxxxx>]

If the return value of releasepage is equal to zero, the page cannot be reclaimed.
Instead, we should return 1 in order to reclaim clean pages.

Signed-off-by: Jaegeuk Kim <jaegeuk.kim@xxxxxxxxxxx>
---
 fs/f2fs/data.c |  4 +++-
 fs/f2fs/node.c | 13 +++----------
 2 files changed, 6 insertions(+), 11 deletions(-)

diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index 6616137..cd6b2cc 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -680,8 +680,10 @@ static void f2fs_invalidate_data_page(struct page *page, unsigned long offset)
 
 static int f2fs_release_data_page(struct page *page, gfp_t wait)
 {
+	if (PageWriteback(page))
+		return 0;
 	ClearPagePrivate(page);
-	return 0;
+	return 1;
 }
 
 static int f2fs_set_data_page_dirty(struct page *page)
diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
index 94951d9..c60919f 100644
--- a/fs/f2fs/node.c
+++ b/fs/f2fs/node.c
@@ -933,7 +933,6 @@ struct page *get_node_page_ra(struct page *parent, int start)
 	if (!nid)
 		return ERR_PTR(-ENOENT);
 
-repeat:
 	page = grab_cache_page(mapping, nid);
 	if (!page)
 		return ERR_PTR(-ENOMEM);
@@ -961,12 +960,6 @@ page_hit:
 		f2fs_put_page(page, 1);
 		return ERR_PTR(-EIO);
 	}
-
-	/* Has the page been truncated? */
-	if (page->mapping != mapping) {
-		f2fs_put_page(page, 1);
-		goto repeat;
-	}
 	mark_page_accessed(page);
 	return page;
 }
@@ -1188,8 +1181,10 @@ static void f2fs_invalidate_node_page(struct page *page, unsigned long offset)
 
 static int f2fs_release_node_page(struct page *page, gfp_t wait)
 {
+	if (PageWriteback(page))
+		return 0;
 	ClearPagePrivate(page);
-	return 0;
+	return 1;
 }
 
 /*
@@ -1630,8 +1625,6 @@ flush_now:
 			write_lock(&nm_i->nat_tree_lock);
 			__del_from_nat_cache(nm_i, ne);
 			write_unlock(&nm_i->nat_tree_lock);
-
-			/* We can reuse this freed nid at this point */
 			add_free_nid(NM_I(sbi), nid);
 		} else {
 			write_lock(&nm_i->nat_tree_lock);
-- 
1.8.1.3.566.gaa39828

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