[Qemu-devel] [PATCH 1/6] 9pfs-proxy: simplify v9fs_request() a bit

[Michael Tokarev]

This simplifies code in v9fs_request() a bit by replacing several
ifs with a common variable check and rearranging error/cleanup
code a bit.

Signet-off-by: Michael Tokarev <m...@tls.msk.ru>
---
 hw/9pfs/virtio-9p-proxy.c | 48 ++++++++++++++++++++---------------------------
 1 file changed, 20 insertions(+), 28 deletions(-)

diff --git a/hw/9pfs/virtio-9p-proxy.c b/hw/9pfs/virtio-9p-proxy.c
index 59c7445..f252fe4 100644
--- a/hw/9pfs/virtio-9p-proxy.c
+++ b/hw/9pfs/virtio-9p-proxy.c
@@ -299,7 +299,7 @@ static int v9fs_request(V9fsProxy *proxy, int type,
     dev_t rdev;
     va_list ap;
     int size = 0;
-    int retval = 0;
+    int retval = 0, err;
     uint64_t offset;
     ProxyHeader header = { 0, 0};
     struct timespec spec[2];
@@ -310,10 +310,11 @@ static int v9fs_request(V9fsProxy *proxy, int type,
 
     qemu_mutex_lock(&proxy->mutex);
 
-    if (proxy->sockfd == -1) {
+    if (proxy->sockfd < 0) {
         retval = -EIO;
-        goto err_out;
+        goto out;
     }
+
     iovec = &proxy->out_iovec;
     reply = &proxy->in_iovec;
     va_start(ap, fmt);
@@ -529,15 +530,15 @@ static int v9fs_request(V9fsProxy *proxy, int type,
     va_end(ap);
 
     if (retval < 0) {
-        goto err_out;
+        goto out;
     }
 
     /* marshal the header details */
     proxy_marshal(iovec, 0, "dd", header.type, header.size);
     header.size += PROXY_HDR_SZ;
 
-    retval = qemu_write_full(proxy->sockfd, iovec->iov_base, header.size);
-    if (retval != header.size) {
+    err = qemu_write_full(proxy->sockfd, iovec->iov_base, header.size);
+    if (err != header.size) {
         goto close_error;
     }
 
@@ -548,9 +549,7 @@ static int v9fs_request(V9fsProxy *proxy, int type,
          * A file descriptor is returned as response for
          * T_OPEN,T_CREATE on success
          */
-        if (v9fs_receivefd(proxy->sockfd, &retval) < 0) {
-            goto close_error;
-        }
+        err = v9fs_receivefd(proxy->sockfd, &retval);
         break;
     case T_MKNOD:
     case T_MKDIR:
@@ -564,41 +563,34 @@ static int v9fs_request(V9fsProxy *proxy, int type,
     case T_REMOVE:
     case T_LSETXATTR:
     case T_LREMOVEXATTR:
-        if (v9fs_receive_status(proxy, reply, &retval) < 0) {
-            goto close_error;
-        }
+        err = v9fs_receive_status(proxy, reply, &retval);
         break;
     case T_LSTAT:
     case T_READLINK:
     case T_STATFS:
     case T_GETVERSION:
-        if (v9fs_receive_response(proxy, type, &retval, response) < 0) {
-            goto close_error;
-        }
+        err = v9fs_receive_response(proxy, type, &retval, response);
         break;
     case T_LGETXATTR:
     case T_LLISTXATTR:
         if (!size) {
-            if (v9fs_receive_status(proxy, reply, &retval) < 0) {
-                goto close_error;
-            }
+            err = v9fs_receive_status(proxy, reply, &retval);
         } else {
-            if (v9fs_receive_response(proxy, type, &retval, response) < 0) {
-                goto close_error;
-            }
+            err = v9fs_receive_response(proxy, type, &retval, response);
         }
         break;
     }
 
-err_out:
-    qemu_mutex_unlock(&proxy->mutex);
-    return retval;
-
+    if (err < 0) {
 close_error:
-    close(proxy->sockfd);
-    proxy->sockfd = -1;
+        close(proxy->sockfd);
+        proxy->sockfd = -1;
+        retval = -EIO;
+    }
+
+out:
     qemu_mutex_unlock(&proxy->mutex);
-    return -EIO;
+    return retval;
 }
 
 static int proxy_lstat(FsContext *fs_ctx, V9fsPath *fs_path, struct stat 
*stbuf)
-- 
2.1.4