[virtio-9p] Add datasync to server side TFSYNC/RFSYNC for dotl

SYNOPSIS
    size[4] Tfsync tag[2] fid[4] datasync[4]

    size[4] Rfsync tag[2]

DESCRIPTION

    The Tfsync transaction transfers ("flushes") all modified in-core data of
    file identified by fid to the disk device (or other  permanent  storage
    device)  where that  file  resides.

    If datasync flag is specified data will be fleshed but does not flush
    modified metadata unless  that  metadata  is  needed  in order to allow a
    subsequent data retrieval to be correctly handled.

Signed-off-by: Venkateswararao Jujjuri <jvrao@linux.vnet.ibm.com>

1 files changed, 6 insertions, 2 deletions

diff --git a/hw/virtio-9p-local.c b/hw/virtio-9p-local.c
index 0d52020..656bfb3 100644
--- a/hw/virtio-9p-local.c
+++ b/hw/virtio-9p-local.c
@@ -490,9 +490,13 @@ static int local_remove(FsContext *ctx, const char *path)
     return remove(rpath(ctx, path));
 }
 
-static int local_fsync(FsContext *ctx, int fd)
+static int local_fsync(FsContext *ctx, int fd, int datasync)
 {
-    return fsync(fd);
+    if (datasync) {
+        return qemu_fdatasync(fd);
+    } else {
+        return fsync(fd);
+    }
 }
 
 static int local_statfs(FsContext *s, const char *path, struct statfs *stbuf)