Please note that diffs are not public domain; they are subject to the
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===================================================================
RCS file: /ftp/cvs/cvsroot/src/sys/fs/puffs/puffs_vnops.c,v
rcsdiff: /ftp/cvs/cvsroot/src/sys/fs/puffs/puffs_vnops.c,v: warning: Unknown phrases like `commitid ...;' are present.
retrieving revision 1.163.2.10
retrieving revision 1.163.2.11
diff -u -p -r1.163.2.10 -r1.163.2.11
--- src/sys/fs/puffs/puffs_vnops.c	2014/11/09 11:05:15	1.163.2.10
+++ src/sys/fs/puffs/puffs_vnops.c	2015/01/16 19:44:53	1.163.2.11
@@ -1,4 +1,4 @@
-/*	$NetBSD: puffs_vnops.c,v 1.163.2.10 2014/11/09 11:05:15 msaitoh Exp $	*/
+/*	$NetBSD: puffs_vnops.c,v 1.163.2.11 2015/01/16 19:44:53 martin Exp $	*/
 
 /*
  * Copyright (c) 2005, 2006, 2007  Antti Kantee.  All Rights Reserved.
@@ -30,7 +30,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: puffs_vnops.c,v 1.163.2.10 2014/11/09 11:05:15 msaitoh Exp $");
+__KERNEL_RCSID(0, "$NetBSD: puffs_vnops.c,v 1.163.2.11 2015/01/16 19:44:53 martin Exp $");
 
 #include <sys/param.h>
 #include <sys/buf.h>
@@ -2261,9 +2261,17 @@ puffs_vnop_read(void *v)
 	if (uio->uio_offset < 0)
 		return EFBIG;
 
+	/*
+	 * On the case of reading empty files and (vp->v_size != 0) below:
+	 * some filesystems (hint: FUSE and distributed filesystems) still
+	 * expect to get the READ in order to update atime. Reading through
+	 * the case filters empty files, therefore we prefer to bypass the
+	 * cache here.
+	 */
 	if (vp->v_type == VREG &&
 	    PUFFS_USE_PAGECACHE(pmp) &&
-	    !(pn->pn_stat & PNODE_RDIRECT)) {
+	    !(pn->pn_stat & PNODE_RDIRECT) &&
+	    (vp->v_size != 0)) {
 		const int advice = IO_ADV_DECODE(ap->a_ioflag);
 
 		while (uio->uio_resid > 0) {