contrib/qemu: Import qemu block source code

This qemu block format source code and its minimal
dependency files will be used in the next patch to implement
a qemu-block format translator.

Change-Id: Ic87638972f7ea9b3df84d7a0539512a250c11c1c
BUG: 986775
Signed-off-by: Anand Avati <avati@redhat.com>
Reviewed-on: http://review.gluster.org/5366
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>

1 files changed, 170 insertions, 0 deletions

diff --git a/contrib/qemu/qobject/qlist.c b/contrib/qemu/qobject/qlist.c
new file mode 100644
index 000000000..1ced0de58
--- /dev/null
+++ b/contrib/qemu/qobject/qlist.c
@@ -0,0 +1,170 @@
+/*
+ * QList Module
+ *
+ * Copyright (C) 2009 Red Hat Inc.
+ *
+ * Authors:
+ *  Luiz Capitulino <lcapitulino@redhat.com>
+ *
+ * This work is licensed under the terms of the GNU LGPL, version 2.1 or later.
+ * See the COPYING.LIB file in the top-level directory.
+ */
+
+#include "qapi/qmp/qlist.h"
+#include "qapi/qmp/qobject.h"
+#include "qemu/queue.h"
+#include "qemu-common.h"
+
+static void qlist_destroy_obj(QObject *obj);
+
+static const QType qlist_type = {
+    .code = QTYPE_QLIST,
+    .destroy = qlist_destroy_obj,
+};
+ 
+/**
+ * qlist_new(): Create a new QList
+ *
+ * Return strong reference.
+ */
+QList *qlist_new(void)
+{
+    QList *qlist;
+
+    qlist = g_malloc(sizeof(*qlist));
+    QTAILQ_INIT(&qlist->head);
+    QOBJECT_INIT(qlist, &qlist_type);
+
+    return qlist;
+}
+
+static void qlist_copy_elem(QObject *obj, void *opaque)
+{
+    QList *dst = opaque;
+
+    qobject_incref(obj);
+    qlist_append_obj(dst, obj);
+}
+
+QList *qlist_copy(QList *src)
+{
+    QList *dst = qlist_new();
+
+    qlist_iter(src, qlist_copy_elem, dst);
+
+    return dst;
+}
+
+/**
+ * qlist_append_obj(): Append an QObject into QList
+ *
+ * NOTE: ownership of 'value' is transferred to the QList
+ */
+void qlist_append_obj(QList *qlist, QObject *value)
+{
+    QListEntry *entry;
+
+    entry = g_malloc(sizeof(*entry));
+    entry->value = value;
+
+    QTAILQ_INSERT_TAIL(&qlist->head, entry, next);
+}
+
+/**
+ * qlist_iter(): Iterate over all the list's stored values.
+ *
+ * This function allows the user to provide an iterator, which will be
+ * called for each stored value in the list.
+ */
+void qlist_iter(const QList *qlist,
+                void (*iter)(QObject *obj, void *opaque), void *opaque)
+{
+    QListEntry *entry;
+
+    QTAILQ_FOREACH(entry, &qlist->head, next)
+        iter(entry->value, opaque);
+}
+
+QObject *qlist_pop(QList *qlist)
+{
+    QListEntry *entry;
+    QObject *ret;
+
+    if (qlist == NULL || QTAILQ_EMPTY(&qlist->head)) {
+        return NULL;
+    }
+
+    entry = QTAILQ_FIRST(&qlist->head);
+    QTAILQ_REMOVE(&qlist->head, entry, next);
+
+    ret = entry->value;
+    g_free(entry);
+
+    return ret;
+}
+
+QObject *qlist_peek(QList *qlist)
+{
+    QListEntry *entry;
+    QObject *ret;
+
+    if (qlist == NULL || QTAILQ_EMPTY(&qlist->head)) {
+        return NULL;
+    }
+
+    entry = QTAILQ_FIRST(&qlist->head);
+
+    ret = entry->value;
+
+    return ret;
+}
+
+int qlist_empty(const QList *qlist)
+{
+    return QTAILQ_EMPTY(&qlist->head);
+}
+
+static void qlist_size_iter(QObject *obj, void *opaque)
+{
+    size_t *count = opaque;
+    (*count)++;
+}
+
+size_t qlist_size(const QList *qlist)
+{
+    size_t count = 0;
+    qlist_iter(qlist, qlist_size_iter, &count);
+    return count;
+}
+
+/**
+ * qobject_to_qlist(): Convert a QObject into a QList
+ */
+QList *qobject_to_qlist(const QObject *obj)
+{
+    if (qobject_type(obj) != QTYPE_QLIST) {
+        return NULL;
+    }
+
+    return container_of(obj, QList, base);
+}
+
+/**
+ * qlist_destroy_obj(): Free all the memory allocated by a QList
+ */
+static void qlist_destroy_obj(QObject *obj)
+{
+    QList *qlist;
+    QListEntry *entry, *next_entry;
+
+    assert(obj != NULL);
+    qlist = qobject_to_qlist(obj);
+
+    QTAILQ_FOREACH_SAFE(entry, &qlist->head, next, next_entry) {
+        QTAILQ_REMOVE(&qlist->head, entry, next);
+        qobject_decref(entry->value);
+        g_free(entry);
+    }
+
+    g_free(qlist);
+}