fs/9p: mark inode attribute invalid on rename, unlink and setattr

rename, unlink and setattr can result in update of inode attribute.
So mark the cached copy invalid

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com>
Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>

fs/9p/vfs_inode_dotl.c

@@ -455,6 +455,7 @@ int v9fs_vfs_setattr_dotl(struct dentry *dentry, struct iattr *iattr)
 	if (retval < 0)
 		return retval;
 
+	v9fs_invalidate_inode_attr(dentry->d_inode);
 	if ((iattr->ia_valid & ATTR_SIZE) &&
 	    iattr->ia_size != i_size_read(dentry->d_inode)) {
 		retval = vmtruncate(dentry->d_inode, iattr->ia_size);