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

[Xen patchbot-unstable <patchbot-unstable@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User Keir Fraser <keir.fraser@xxxxxxxxxx>
# Date 1271053336 -3600
# Node ID b5f9c6274d917db5bbe6cb9cc0d59910cc07a8a6
# Parent  5bc70100b514d98bd3938cdeca1e182726c26df2
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>
---
 tools/libxc/xc_domain_save.c |    7 +++++++
 1 files changed, 7 insertions(+)

diff -r 5bc70100b514 -r b5f9c6274d91 tools/libxc/xc_domain_save.c
--- a/tools/libxc/xc_domain_save.c      Mon Apr 12 07:21:44 2010 +0100
+++ b/tools/libxc/xc_domain_save.c      Mon Apr 12 07:22:16 2010 +0100
@@ -1764,6 +1764,13 @@ 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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