ceph: invalidate pages even if truncate is pending

There is no reason not to invalidate pages when a truncate is pending.
Both throw out page cache pages.

Signed-off-by: Sage Weil <sage@newdream.net>

fs/ceph/caps.c

@@ -1444,7 +1444,6 @@ void ceph_check_caps(struct ceph_inode_info *ci, int flags,
 	    ci->i_rdcache_gen &&                     /* may have cached pages */
 	    (file_wanted == 0 ||                     /* no open files */
 	     (revoking & CEPH_CAP_FILE_CACHE)) &&     /*  or revoking cache */
-	    !ci->i_truncate_pending &&
 	    !tried_invalidate) {
 		u32 invalidating_gen = ci->i_rdcache_gen;
 		int ret;