gfs2_atomic_open(): skip lookups on hashed dentry

hashed dentry can be passed to ->atomic_open() only if a) it has just passed revalidation and b) it's negative Signed-off-by: Al Viro <[email protected]>
wangyan0507 · Oct 9, 2014 · 4d93bc3 · 4d93bc3
1 parent 18c85d0
commit 4d93bc3
Showing 1 changed file with 5 additions and 0 deletions.
diff --git a/fs/gfs2/inode.c b/fs/gfs2/inode.c
@@ -1244,6 +1244,9 @@ static int gfs2_atomic_open(struct inode *dir, struct dentry *dentry,
 	struct dentry *d;
 	bool excl = !!(flags & O_EXCL);
 
+	if (!d_unhashed(dentry))
+		goto skip_lookup;
+
 	d = __gfs2_lookup(dir, dentry, file, opened);
 	if (IS_ERR(d))
 		return PTR_ERR(d);
@@ -1260,6 +1263,8 @@ static int gfs2_atomic_open(struct inode *dir, struct dentry *dentry,
 	}
 
 	BUG_ON(d != NULL);
+
+skip_lookup:
 	if (!(flags & O_CREAT))
 		return -ENOENT;