[Xen-changelog] [xen-3.4-testing] libxc: Flush I/O before xc_domain_save completion

["Xen patchbot-3.4-testing" <patchbot-3.4-testing@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User Keir Fraser <keir.fraser@xxxxxxxxxx>
# Date 1271092383 -3600
# Node ID a42e9575a59c75184b5f22c3c661f098d67c2861
# Parent  2b26f975c971d8c46878bd9bc169e42cc3d34cc0
libxc: Flush I/O before xc_domain_save completion

The final, flushing call to discard_file_cache also discards any
errors from fsync. Call fsync explicitly before leaving, to check if
all VM memory actually made it to the disk.

Signed-off-by: Daniel Stodden <daniel.stodden@xxxxxxxxxx>
xen-unstable changeset:   21128:b5f9c6274d91
xen-unstable date:        Mon Apr 12 07:22:16 2010 +0100
---
 tools/libxc/xc_domain_save.c |    7 +++++++
 1 files changed, 7 insertions(+)

diff -r 2b26f975c971 -r a42e9575a59c tools/libxc/xc_domain_save.c
--- a/tools/libxc/xc_domain_save.c      Mon Apr 12 18:11:39 2010 +0100
+++ b/tools/libxc/xc_domain_save.c      Mon Apr 12 18:13:03 2010 +0100
@@ -1598,6 +1598,13 @@ int xc_domain_save(int xc_handle, int io
         goto out;
     }
 
+    /* Flush last write and check for errors. */
+    if ( fsync(io_fd) && errno != EINVAL )
+    {
+        PERROR("Error when flushing state file");
+        goto out;
+    }
+
     /* Success! */
     rc = 0;
 

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