fs/9p: Prevent multiple inclusion of same header

Add necessary #ifndef #endif blocks to avoid mulitple inclusion of same headers

Signed-off-by: Aneesh Kumar K.V <[e-mail]>
Signed-off-by: Venkateswararao Jujjuri <[e-mail]>
Signed-off-by: Eric Van Hensbergen <[e-mail]>

fs/9p/fid.h

···
  *  Boston, MA  02111-1301  USA
  *
  */
-
+#ifndef FS_9P_FID_H
+#define FS_9P_FID_H
 #include <linux/list.h>
 
 /**
···
 struct p9_fid *v9fs_fid_clone(struct dentry *dentry);
 int v9fs_fid_add(struct dentry *dentry, struct p9_fid *fid);
 struct p9_fid *v9fs_writeback_fid(struct dentry *dentry);
+#endif

fs/9p/v9fs.h

···
  *  Boston, MA  02111-1301  USA
  *
  */
+#ifndef FS_9P_V9FS_H
+#define FS_9P_V9FS_H
+
 #include <linux/backing-dev.h>
 
 /**
···
 	else
 		return v9fs_inode_from_fid(v9ses, fid, sb);
 }
+#endif

fs/9p/v9fs_vfs.h

···
  *  Boston, MA  02111-1301  USA
  *
  */
+#ifndef FS_9P_V9FS_VFS_H
+#define FS_9P_V9FS_VFS_H
 
 /* plan9 semantics are that created files are implicitly opened.
  * But linux semantics are that you call create, then open.
···
  * unlink calls remove, which is an implicit clunk. So we have to track
  * that kind of thing so that we don't try to clunk a dead fid.
  */
+#define P9_LOCK_TIMEOUT (30*HZ)
 
 extern struct file_system_type v9fs_fs_type;
 extern const struct address_space_operations v9fs_addr_operations;
···
 	v9inode->cache_validity |= V9FS_INO_INVALID_ATTR;
 	return;
 }
-
-#define P9_LOCK_TIMEOUT (30*HZ)
+#endif