File libvirt-iohelper-Don-t-report-errors-on-special-FDs.patch of Package libvirt

From e46d85403482eff73d5aeb55a7bc753151ceb129 Mon Sep 17 00:00:00 2001
Message-Id: <e46d85403482eff73d5aeb55a7bc753151ceb129.1352726474.git.jdenemar@redhat.com>
From: Michal Privoznik <mprivozn@redhat.com>
Date: Mon, 5 Nov 2012 17:22:47 +0100
Subject: [PATCH] iohelper: Don't report errors on special FDs

https://bugzilla.redhat.com/show_bug.cgi?id=866369

Some FDs may not implement fdatasync() functionality,
e.g.  pipes. In that case EINVAL or EROFS is returned.
We don't want to fail then nor report any error.

Reported-by: Christophe Fergeau <cfergeau@redhat.com>
(cherry picked from commit 46325e51310344872597453ba5d621afa88d44c1)
---
 src/util/iohelper.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/src/util/iohelper.c b/src/util/iohelper.c
index 860e14a..a9c8b4c 100644
--- a/src/util/iohelper.c
+++ b/src/util/iohelper.c
@@ -181,8 +181,11 @@ runIO(const char *path, int fd, int oflags, unsigned long long length)
 
     /* Ensure all data is written */
     if (fdatasync(fdout) < 0) {
-        virReportSystemError(errno, _("unable to fsync %s"), fdoutname);
-        goto cleanup;
+        if (errno != EINVAL && errno != EROFS) {
+            /* fdatasync() may fail on some special FDs, e.g. pipes */
+            virReportSystemError(errno, _("unable to fsync %s"), fdoutname);
+            goto cleanup;
+        }
     }
 
     ret = 0;
-- 
1.8.0