--- sys/fs/fuse/fuse_vnops.c.orig	2018-08-10 09:34:24.492125000 +0200
+++ sys/fs/fuse/fuse_vnops.c	2018-08-10 09:38:38.890095000 +0200
@@ -823,6 +823,7 @@
 
 		struct fuse_entry_out *feo = NULL;
 		struct fuse_attr *fattr = NULL;
+		struct fuse_vnode_data *fvdat = NULL;
 
 		if (op == FUSE_GETATTR) {
 			fattr = &((struct fuse_attr_out *)fdi.answ)->attr;
@@ -971,6 +972,24 @@
 			cache_attrs(*vpp, (struct fuse_entry_out *)fdi.answ);
 		}
 
+		fvdat = VTOFUD(*vpp);
+
+		if (vnode_isreg(*vpp) && (fvdat->flag & FN_SIZECHANGE) == 0) {
+			/*
+			 * This is for those cases when the file size changed without us
+			 * knowing, and we want to catch up.
+			 */
+			off_t new_filesize;
+			if (op == FUSE_GETATTR) {
+				new_filesize = ((struct fuse_attr_out *)fdi.answ)->attr.size;
+			} else {
+				new_filesize = ((struct fuse_entry_out *)fdi.answ)->attr.size;
+			}
+
+			if (fvdat->filesize != new_filesize) {
+				fuse_vnode_setsize(*vpp, cred, new_filesize);
+			}
+		}
 		/* Insert name into cache if appropriate. */
 
 		/*