[CIFS] Explicitly set stat->blksize

CIFS may perform I/O over the network in larger chunks than the page size,
so it should explicitly set stat->blksize to ensure optimal I/O bandwidth
Signed-off-by: NDave Kleikamp <shaggy@linux.vnet.ibm.com>
Signed-off-by: NSteve French <sfrench@us.ibm.com>

fs/cifs/inode.c

@@ -1089,8 +1089,10 @@ int cifs_getattr(struct vfsmount *mnt, struct dentry *dentry,
 	struct kstat *stat)
 {
 	int err = cifs_revalidate(dentry);
-	if (!err)
+	if (!err) {
 		generic_fillattr(dentry->d_inode, stat);
+		stat->blksize = CIFS_MAX_MSGSIZE;
+	}
 	return err;
 }