ceph: trigger to flush the buffer when making snapshot

The 'i_wr_ref' is used to track the 'Fb' caps, while whenever the 'Fb'
caps is took the kclient will always take the 'Fw' caps at the same
time. That means it will always be a false check in __ceph_finish_cap_snap().

When writing to buffer the kclient will take both 'Fb|Fw' caps and then
write the contents to the buffer pages by increasing the 'i_wrbuffer_ref'
and then just release both 'Fb|Fw'. This is different with the user
space libcephfs, which will keep the 'Fb' being took and use 'i_wr_ref'
instead of 'i_wrbuffer_ref' to track this until the buffer is flushed
to Rados.

We need to defer flushing the capsnap until the corresponding buffer
pages are all flushed to Rados, and at the same time just trigger to
flush the buffer pages immediately.

Link: https://tracker.ceph.com/issues/48640
Link: https://tracker.ceph.com/issues/59343Signed-off-by: Xiubo Li <xiubli@redhat.com>
Reviewed-by: Milind Changire <mchangir@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>

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 &&

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;
 	}