ceph: add destination file data sync before doing any remote copy

Luis Henriques · idryomov · commit c2c6d3ce0d9a · 2018-11-08T17:50:37.000+01:00
If we try to copy into a file that was just written, any data that is remote copied will be overwritten by our buffered writes once they are flushed. When this happens, the call to invalidate_inode_pages2_range will also return a -EBUSY error. This patch fixes this by also sync'ing the destination file before starting any copy. Fixes: 503f82a ("ceph: support copy_file_range file operation") Signed-off-by: Luis Henriques <lhenriques@suse.com> Reviewed-by: "Yan, Zheng" <zyan@redhat.com> Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
diff --git a/fs/ceph/file.c b/fs/ceph/file.c
@@ -1931,10 +1931,17 @@ static ssize_t ceph_copy_file_range(struct file *src_file, loff_t src_off,
 	if (!prealloc_cf)
 		return -ENOMEM;
 
-	/* Start by sync'ing the source file */
+	/* Start by sync'ing the source and destination files */
 	ret = file_write_and_wait_range(src_file, src_off, (src_off + len));
-	if (ret < 0)
+	if (ret < 0) {
+		dout("failed to write src file (%zd)\n", ret);
+		goto out;
+	}
+	ret = file_write_and_wait_range(dst_file, dst_off, (dst_off + len));
+	if (ret < 0) {
+		dout("failed to write dst file (%zd)\n", ret);
 		goto out;
+	}
 
 	/*
 	 * We need FILE_WR caps for dst_ci and FILE_RD for src_ci as other
