From: Jaegeuk Kim <jaegeuk@kernel.org>
Date: Sat, 7 Feb 2015 02:53:45 +0000 (-0800)
Subject: f2fs: check node page contents all the time
X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=aaf9607516ed38825268515ef4d773289a44f429;p=deliverable%2Flinux.git

f2fs: check node page contents all the time

In get_node_page, if the page is up-to-date, we assumed that the page was not
reclaimed at all.
But, sometimes it was reported that its contents was missing.
So, just for sure, let's check its mapping and contents.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
---

diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
index ea22c3210c8a..1e354ff9f7d8 100644
--- a/fs/f2fs/node.c
+++ b/fs/f2fs/node.c
@@ -1036,11 +1036,11 @@ repeat:
 	err = read_node_page(page, READ_SYNC);
 	if (err < 0)
 		return ERR_PTR(err);
-	else if (err == LOCKED_PAGE)
-		goto got_it;
+	else if (err != LOCKED_PAGE)
+		lock_page(page);
 
-	lock_page(page);
 	if (unlikely(!PageUptodate(page) || nid != nid_of_node(page))) {
+		ClearPageUptodate(page);
 		f2fs_put_page(page, 1);
 		return ERR_PTR(-EIO);
 	}
@@ -1048,7 +1048,6 @@ repeat:
 		f2fs_put_page(page, 1);
 		goto repeat;
 	}
-got_it:
 	return page;
 }