diff --git a/hw/file-op-9p.h b/hw/file-op-9p.h
index 21d60b5855..c7731c2993 100644
--- a/hw/file-op-9p.h
+++ b/hw/file-op-9p.h
@@ -86,7 +86,7 @@ typedef struct FileOperations
     int (*fstat)(FsContext *, int, struct stat *);
     int (*rename)(FsContext *, const char *, const char *);
     int (*truncate)(FsContext *, const char *, off_t);
-    int (*fsync)(FsContext *, int);
+    int (*fsync)(FsContext *, int, int);
     int (*statfs)(FsContext *s, const char *path, struct statfs *stbuf);
     ssize_t (*lgetxattr)(FsContext *, const char *,
                          const char *, void *, size_t);
diff --git a/hw/virtio-9p-local.c b/hw/virtio-9p-local.c
index 0d520201b4..656bfb375b 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)
diff --git a/hw/virtio-9p.c b/hw/virtio-9p.c
index daade77ed9..7c59988a51 100644
--- a/hw/virtio-9p.c
+++ b/hw/virtio-9p.c
@@ -248,9 +248,9 @@ static int v9fs_do_remove(V9fsState *s, V9fsString *path)
     return s->ops->remove(&s->ctx, path->data);
 }
 
-static int v9fs_do_fsync(V9fsState *s, int fd)
+static int v9fs_do_fsync(V9fsState *s, int fd, int datasync)
 {
-    return s->ops->fsync(&s->ctx, fd);
+    return s->ops->fsync(&s->ctx, fd, datasync);
 }
 
 static int v9fs_do_statfs(V9fsState *s, V9fsString *path, struct statfs *stbuf)
@@ -1868,16 +1868,17 @@ static void v9fs_fsync(V9fsState *s, V9fsPDU *pdu)
     int32_t fid;
     size_t offset = 7;
     V9fsFidState *fidp;
+    int datasync;
     int err;
 
-    pdu_unmarshal(pdu, offset, "d", &fid);
+    pdu_unmarshal(pdu, offset, "dd", &fid, &datasync);
     fidp = lookup_fid(s, fid);
     if (fidp == NULL) {
         err = -ENOENT;
         v9fs_post_do_fsync(s, pdu, err);
         return;
     }
-    err = v9fs_do_fsync(s, fidp->fs.fd);
+    err = v9fs_do_fsync(s, fidp->fs.fd, datasync);
     v9fs_post_do_fsync(s, pdu, err);
 }
 
@@ -3001,7 +3002,7 @@ static void v9fs_wstat(V9fsState *s, V9fsPDU *pdu)
 
     /* do we need to sync the file? */
     if (donttouch_stat(&vs->v9stat)) {
-        err = v9fs_do_fsync(s, vs->fidp->fs.fd);
+        err = v9fs_do_fsync(s, vs->fidp->fs.fd, 0);
         v9fs_wstat_post_fsync(s, vs, err);
         return;
     }