[Qemu-devel] [v1 PATCH 3/3]: Convert v9fs_stat to threaded model.

[Arun R Bharadwaj <arun@linux.vnet.ibm.com>]

* Arun R Bharadwaj <arun@linux.vnet.ibm.com> [2011-03-15 16:04:53]:

Author: Harsh Prateek Bora <harsh@linux.vnet.ibm.com>
Date:   Mon Mar 14 13:55:37 2011 +0530

    Convert v9fs_stat to threaded model.
    
    This patch converts v9fs_stat syscall of 9pfs to threaded
    model by making use of the helper routines provided
    created by the previous patch.
    
    Signed-off-by: Harsh Prateek Bora <harsh@linux.vnet.ibm.com>
    Signed-off-by: Arun R Bharadwaj <arun@linux.vnet.ibm.com>

diff --git a/hw/9pfs/virtio-9p.c b/hw/9pfs/virtio-9p.c
index cf61345..a328e97 100644
--- a/hw/9pfs/virtio-9p.c
+++ b/hw/9pfs/virtio-9p.c
@@ -1458,26 +1458,35 @@ out:
     v9fs_string_free(&aname);
 }
 
-static void v9fs_stat_post_lstat(V9fsState *s, V9fsStatState *vs, int err)
+static void v9fs_stat_post_lstat(void *opaque)
 {
-    if (err == -1) {
-        err = -errno;
+    V9fsStatState *vs = (V9fsStatState *)opaque;
+    if (vs->err == -1) {
+        vs->err = -(vs->v9fs_errno);
         goto out;
     }
 
-    err = stat_to_v9stat(s, &vs->fidp->fsmap.path, &vs->stbuf, &vs->v9stat);
-    if (err) {
+    vs->err = stat_to_v9stat(vs->s, &vs->fidp->fsmap.path, &vs->stbuf, &vs->v9stat);
+    if (vs->err) {
         goto out;
     }
     vs->offset += pdu_marshal(vs->pdu, vs->offset, "wS", 0, &vs->v9stat);
-    err = vs->offset;
+    vs->err = vs->offset;
 
 out:
-    complete_pdu(s, vs->pdu, err);
+    complete_pdu(vs->s, vs->pdu, vs->err);
     v9fs_stat_free(&vs->v9stat);
     qemu_free(vs);
 }
 
+static void v9fs_stat_do_lstat(V9fsRequest *request)
+{
+    V9fsStatState *vs = container_of(request, V9fsStatState, request);
+
+    vs->err = v9fs_do_lstat(vs->s, &vs->fidp->fsmap.path, &vs->stbuf);
+    vs->v9fs_errno = errno;
+}
+
 static void v9fs_stat(V9fsState *s, V9fsPDU *pdu)
 {
     int32_t fid;
@@ -1487,6 +1496,10 @@ static void v9fs_stat(V9fsState *s, V9fsPDU *pdu)
     vs = qemu_malloc(sizeof(*vs));
     vs->pdu = pdu;
     vs->offset = 7;
+    vs->s = s;
+    vs->request.func = v9fs_stat_do_lstat;
+    vs->request.post_op.func = v9fs_stat_post_lstat;
+    vs->request.post_op.arg = vs;
 
     memset(&vs->v9stat, 0, sizeof(vs->v9stat));
 
@@ -1498,8 +1511,11 @@ static void v9fs_stat(V9fsState *s, V9fsPDU *pdu)
         goto out;
     }
 
+    /*
     err = v9fs_do_lstat(s, &vs->fidp->fsmap.path, &vs->stbuf);
     v9fs_stat_post_lstat(s, vs, err);
+    */
+    v9fs_qemu_submit_request(&vs->request);
     return;
 
 out:
diff --git a/hw/9pfs/virtio-9p.h b/hw/9pfs/virtio-9p.h
index e7d2326..1d6c17c 100644
--- a/hw/9pfs/virtio-9p.h
+++ b/hw/9pfs/virtio-9p.h
@@ -271,6 +271,10 @@ typedef struct V9fsStatState {
     V9fsStat v9stat;
     V9fsFidState *fidp;
     struct stat stbuf;
+    V9fsState *s;
+    int err;
+    int v9fs_errno;
+    V9fsRequest request;
 } V9fsStatState;
 
 typedef struct V9fsStatDotl {