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Blame SOURCES/kvm-nbd-Always-call-close_fn-in-nbd_client_new.patch

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From 2efca7904a7a71d44bdf715208899e3bb29711df Mon Sep 17 00:00:00 2001
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From: Fam Zheng <famz@redhat.com>
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Date: Thu, 10 Mar 2016 04:00:51 +0100
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Subject: [PATCH 2/5] nbd: Always call "close_fn" in nbd_client_new
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RH-Author: Fam Zheng <famz@redhat.com>
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Message-id: <1457582453-13835-2-git-send-email-famz@redhat.com>
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Patchwork-id: 69757
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O-Subject: [RHEL-7.3 qemu-kvm PATCH v2 1/3] nbd: Always call "close_fn" in nbd_client_new
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Bugzilla: 1285453
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RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
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RH-Acked-by: Paolo Bonzini <pbonzini@redhat.com>
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RH-Acked-by: Laurent Vivier <lvivier@redhat.com>
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Rename the parameter "close" to "close_fn" to disambiguous with
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close(2).
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This unifies error handling paths of NBDClient allocation:
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nbd_client_new will shutdown the socket and call the "close_fn" callback
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if negotiation failed, so the caller don't need a different path than
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the normal close.
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The returned pointer is never used, make it void in preparation for the
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next patch.
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Signed-off-by: Fam Zheng <famz@redhat.com>
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Message-Id: <1452760863-25350-2-git-send-email-famz@redhat.com>
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Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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(cherry picked from commit ee7d7aabdaea4484e069cb99c9fc54e8cb24b56f)
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Signed-off-by: Fam Zheng <famz@redhat.com>
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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Conflicts:
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    include/block/nbd.h
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    nbd.c
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    qemu-nbd.c
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* nbd_update_server_fd_handler not in downstream;
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* Context around the changed line is different.
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---
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 include/block/nbd.h |  3 +--
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 nbd.c               | 11 +++++------
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 qemu-nbd.c          |  4 ++--
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 3 files changed, 8 insertions(+), 10 deletions(-)
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diff --git a/include/block/nbd.h b/include/block/nbd.h
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index c90f5e4..92e360e 100644
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--- a/include/block/nbd.h
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+++ b/include/block/nbd.h
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@@ -92,8 +92,7 @@ NBDExport *nbd_export_find(const char *name);
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 void nbd_export_set_name(NBDExport *exp, const char *name);
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 void nbd_export_close_all(void);
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-NBDClient *nbd_client_new(NBDExport *exp, int csock,
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-                          void (*close)(NBDClient *));
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+void nbd_client_new(NBDExport *exp, int csock, void (*close_fn)(NBDClient *));
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 void nbd_client_close(NBDClient *client);
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 void nbd_client_get(NBDClient *client);
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 void nbd_client_put(NBDClient *client);
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diff --git a/nbd.c b/nbd.c
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index f258cdd..ba97270 100644
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--- a/nbd.c
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+++ b/nbd.c
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@@ -1232,8 +1232,7 @@ static void nbd_restart_write(void *opaque)
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     qemu_coroutine_enter(client->send_coroutine, NULL);
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 }
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-NBDClient *nbd_client_new(NBDExport *exp, int csock,
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-                          void (*close)(NBDClient *))
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+void nbd_client_new(NBDExport *exp, int csock, void (*close_fn)(NBDClient *))
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 {
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     NBDClient *client;
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     client = g_malloc0(sizeof(NBDClient));
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@@ -1241,10 +1240,11 @@ NBDClient *nbd_client_new(NBDExport *exp, int csock,
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     client->exp = exp;
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     client->sock = csock;
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     if (nbd_send_negotiate(client) < 0) {
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-        g_free(client);
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-        return NULL;
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+        shutdown(client->sock, 2);
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+        close_fn(client);
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+        return;
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     }
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-    client->close = close;
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+    client->close = close_fn;
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     qemu_co_mutex_init(&client->send_lock);
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     qemu_set_fd_handler2(csock, nbd_can_read, nbd_read, NULL, client);
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@@ -1252,5 +1252,4 @@ NBDClient *nbd_client_new(NBDExport *exp, int csock,
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         QTAILQ_INSERT_TAIL(&exp->clients, client, next);
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         nbd_export_get(exp);
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     }
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-    return client;
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 }
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diff --git a/qemu-nbd.c b/qemu-nbd.c
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index ff792ef..047dd49 100644
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--- a/qemu-nbd.c
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+++ b/qemu-nbd.c
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@@ -297,9 +297,9 @@ static void nbd_accept(void *opaque)
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         close(fd);
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         return;
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     }
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-
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-    if (fd >= 0 && nbd_client_new(exp, fd, nbd_client_closed)) {
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+    if (fd >= 0) {
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         nb_fds++;
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+        nbd_client_new(exp, fd, nbd_client_closed);
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     }
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 }
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-- 
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1.8.3.1
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