diff --git a/fs/ceph/caps.c b/fs/ceph/caps.c
index 2321e5ddb664..6fb73e3a7f8e 100644
--- a/fs/ceph/caps.c
+++ b/fs/ceph/caps.c
@@ -3109,6 +3109,12 @@ static void __ceph_put_cap_refs(struct ceph_inode_info *ci, int had,
 	}
 	if (had & CEPH_CAP_FILE_WR) {
 		if (--ci->i_wr_ref == 0) {
+			/*
+			 * The Fb caps will always be took and released
+			 * together with the Fw caps.
+			 */
+			WARN_ON_ONCE(ci->i_wb_ref);
+
 			last++;
 			check_flushsnaps = true;
 			if (ci->i_wrbuffer_ref_head == 0 &&
diff --git a/fs/ceph/snap.c b/fs/ceph/snap.c
index 2e73ba62bd7a..343d738448dc 100644
--- a/fs/ceph/snap.c
+++ b/fs/ceph/snap.c
@@ -675,14 +675,17 @@ int __ceph_finish_cap_snap(struct ceph_inode_info *ci,
 		return 0;
 	}
 
-	/* Fb cap still in use, delay it */
-	if (ci->i_wb_ref) {
+	/*
+	 * Defer flushing the capsnap if the dirty buffer not flushed yet.
+	 * And trigger to flush the buffer immediately.
+	 */
+	if (ci->i_wrbuffer_ref) {
 		dout("%s %p %llx.%llx cap_snap %p snapc %p %llu %s s=%llu "
 		     "used WRBUFFER, delaying\n", __func__, inode,
 		     ceph_vinop(inode), capsnap, capsnap->context,
 		     capsnap->context->seq, ceph_cap_string(capsnap->dirty),
 		     capsnap->size);
-		capsnap->writing = 1;
+		ceph_queue_writeback(inode);
 		return 0;
 	}