[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, 5 deletions

diff --git a/hw/virtio-9p.c b/hw/virtio-9p.c
index daade77ed..7c59988a5 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;
     }