From: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
Date: Thu, 6 Nov 2008 20:53:52 +0000 (-0800)
Subject: fat: Kill d_invalidate() in vfat_lookup()
X-Git-Tag: v2.6.28-rc4~43
X-Git-Url: http://pilppa.com/gitweb/?a=commitdiff_plain;h=1c13a243a461dd5b089d29e5d57f260c990e462c;p=linux-2.6-omap-h63xx.git

fat: Kill d_invalidate() in vfat_lookup()

d_invalidate() for positive dentry doesn't work in some cases
(vfsmount, nfsd, and maybe others). shrink_dcache_parent() by
d_invalidate() is pointless for vfat usage at all.

So, this kills it, and intead of it uses d_move().

To save old behavior, this returns alias simply for directory (don't
change pwd, etc..). the directory lookup shouldn't be important for
performance.

Signed-off-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

diff --git a/fs/fat/namei_vfat.c b/fs/fat/namei_vfat.c
index d585398f9f6..bf326d4356a 100644
--- a/fs/fat/namei_vfat.c
+++ b/fs/fat/namei_vfat.c
@@ -745,13 +745,12 @@ static struct dentry *vfat_lookup(struct inode *dir, struct dentry *dentry,
 		 *
 		 * Switch to new one for reason of locality if possible.
 		 */
-		if (d_invalidate(alias) == 0)
-			dput(alias);
-		else {
-			iput(inode);
-			unlock_super(sb);
-			return alias;
-		}
+		BUG_ON(d_unhashed(alias));
+		if (!S_ISDIR(inode->i_mode))
+			d_move(alias, dentry);
+		iput(inode);
+		unlock_super(sb);
+		return alias;
 	}
 out:
 	unlock_super(sb);