[patch 19/71] cifs: fix regression with O_EXCL creates and optimize away lookup

[Greg KH]

2.6.30-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Jeff Layton <jlayton@xxxxxxxxxx>

commit 5ddf1e0ff00fd808c048d0b920784828276cc516 upstream.

cifs: fix regression with O_EXCL creates and optimize away lookup

Signed-off-by: Jeff Layton <jlayton@xxxxxxxxxx>
Tested-by: Shirish Pargaonkar <shirishp@xxxxxxxxx>
Signed-off-by: Steve French <sfrench@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>

---
 fs/cifs/dir.c |    9 +++++++++
 1 file changed, 9 insertions(+)

--- a/fs/cifs/dir.c
+++ b/fs/cifs/dir.c
@@ -641,6 +641,15 @@ cifs_lookup(struct inode *parent_dir_ino
 			}
 	}
 
+	/*
+	 * O_EXCL: optimize away the lookup, but don't hash the dentry. Let
+	 * the VFS handle the create.
+	 */
+	if (nd->flags & LOOKUP_EXCL) {
+		d_instantiate(direntry, NULL);
+		return 0;
+	}
+
 	/* can not grab the rename sem here since it would
 	deadlock in the cases (beginning of sys_rename itself)
 	in which we already have the sb rename sem */


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