cifs: Do not lookup hashed negative dentry in cifs_atomic_open

[~andy/linux] / fs / cifs / dir.c

diff --git a/fs/cifs/dir.c b/fs/cifs/dir.c
index 7c0a8128364546111322b4a89caef9009a276980..d3671f2acb29bd313779cf8022efe4c41e9987ef 100644 (file)
--- a/fs/cifs/dir.c
+++ b/fs/cifs/dir.c
@@ -398,7 +398,16 @@ cifs_atomic_open(struct inode *inode, struct dentry *direntry,
         * in network traffic in the other paths.
         */
        if (!(oflags & O_CREAT)) {
-               struct dentry *res = cifs_lookup(inode, direntry, 0);
+               struct dentry *res;
+
+               /*
+                * Check for hashed negative dentry. We have already revalidated
+                * the dentry and it is fine. No need to perform another lookup.
+                */
+               if (!d_unhashed(direntry))
+                       return -ENOENT;
+
+               res = cifs_lookup(inode, direntry, 0);
                if (IS_ERR(res))
                        return PTR_ERR(res);