[Qemu-devel] [PATCH V3 5/5] libqblock test example code

[Wenchao Xia <xiawenc@linux.vnet.ibm.com>]

  In this example, user first create two qcow2 images, and then get the
backing file relationship information of them. Then does write and read
sync IO on them.

Signed-off-by: Wenchao Xia <xiawenc@linux.vnet.ibm.com>
---
 tests/libqblock/libqblock-test.c |  233 ++++++++++++++++++++++++++++++++++++++
 1 files changed, 233 insertions(+), 0 deletions(-)

diff --git a/tests/libqblock/libqblock-test.c b/tests/libqblock/libqblock-test.c
index c05c0c4..c0b7963 100644
--- a/tests/libqblock/libqblock-test.c
+++ b/tests/libqblock/libqblock-test.c
@@ -1,4 +1,237 @@
+/*
+ * QEMU block layer library test
+ *
+ * Copyright IBM, Corp. 2012
+ *
+ * Authors:
+ *  Wenchao Xia   <xiawenc@linux.vnet.ibm.com>
+ *
+ * This work is licensed under the terms of the GNU LGPL, version 2 or later.
+ * See the COPYING.LIB file in the top-level directory.
+ *
+ */
+
+#include <stdarg.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <inttypes.h>
+#include <string.h>
+#include <stdlib.h>
+#include "libqblock.h"
+
+#define TEST_BUF_SIZE 1024
+static unsigned char buf_r[TEST_BUF_SIZE];
+static unsigned char buf_w[TEST_BUF_SIZE] = {0, 0, 0, 0};
+
+typedef struct VerifyData {
+    unsigned char *buf_r;
+    unsigned char *buf_w;
+    int len;
+} VerifyData;
+
+static void print_loc(QBlockProtInfo *loc)
+{
+    if (loc == NULL) {
+        printf("backing file is NULL.");
+        return;
+    }
+    switch (loc->prot_type) {
+    case QB_PROT_NONE:
+        printf("protocol type [none].");
+        break;
+    case QB_PROT_FILE:
+        printf("protocol type [file], filename [%s].",
+               loc->prot_op.o_file.filename);
+        break;
+    default:
+        printf("protocol type not supported.");
+        break;
+    }
+}
+
+static void print_info_image_static(QBlockStaticInfo *info)
+{
+    printf("=======image location:\n");
+    print_loc(&info->loc);
+    printf("\nvirtual_size %" PRId64 ", format type %d [%s]",
+           *(info->member_addr->virt_size),
+           info->fmt.fmt_type, qb_fmttype2str(info->fmt.fmt_type));
+    printf("\nbacking image location:\n");
+    print_loc(info->member_addr->backing_loc);
+    printf("\n");
+}
+
+static void test_check(VerifyData *vdata)
+{
+    int cmp;
+    cmp = memcmp(vdata->buf_r, vdata->buf_w, vdata->len);
+    if (cmp == 0) {
+        printf("compare succeed, %d.\n", vdata->buf_r[24]);
+    } else {
+        printf("!!! compare fail, %d.\n", vdata->buf_r[24]);
+        exit(1);
+    }
+}
+
 int main(int argc, char **argv)
 {
+    const char *filename1, *filename2;
+    QBroker *broker = NULL;
+    QBlockState *qbs = NULL;
+    QBlockProtInfo *ol = NULL;
+    QBlockFmtInfo *of = NULL;
+    QBlockStaticInfo *info_st = NULL;
+    int ret, flag;
+    int test_offset = 510;
+    int test_len = 520;
+    VerifyData vdata;
+    char err_str[1024];
+
+    vdata.buf_r = buf_r;
+    vdata.buf_w = buf_w;
+    vdata.len = test_len;
+
+    filename1 = "./qemu_image1";
+    filename2 = "./qemu_image2";
+    printf("qemu test, filename1 is %s, filename2 is %s.\n",
+                                       filename1, filename2);
+
+    ret = qb_broker_new(&broker);
+    if (ret < 0) {
+        goto free;
+    }
+
+    ret = qb_state_new(broker, &qbs);
+    if (ret < 0) {
+        goto free;
+    }
+
+    ret = qb_prot_info_new(broker, &ol);
+    if (ret < 0) {
+        goto free;
+    }
+
+    ret = qb_fmt_info_new(broker, &of);
+    if (ret < 0) {
+        goto free;
+    }
+
+    /* create a new image */
+
+    ol->prot_type = QB_PROT_FILE;
+    ol->prot_op.o_file.filename = filename2;
+    of->fmt_type = QB_FMT_QCOW2;
+    of->fmt_op.o_qcow2.virt_size = 100 * 1024;
+    flag = 0;
+
+    ret = qb_create(broker, qbs, ol, of, flag);
+    if (ret < 0) {
+        qb_error_get_human_str(broker, err_str, sizeof(err_str));
+        printf("create fail 1. %s.\n", err_str);
+        goto unlink;
+    }
+
+    ol->prot_type = QB_PROT_FILE;
+    ol->prot_op.o_file.filename = filename1;
+    of->fmt_type = QB_FMT_QCOW2;
+    of->fmt_op.o_qcow2.backing_loc.prot_type = QB_PROT_FILE;
+    of->fmt_op.o_qcow2.backing_loc.prot_op.o_file.filename = filename2;
+    flag = 0;
+    ret = qb_create(broker, qbs, ol, of, flag);
+    if (ret < 0) {
+        qb_error_get_human_str(broker, err_str, sizeof(err_str));
+        printf("create fail 2. %s.\n", err_str);
+        goto unlink;
+    }
+
+    /* get informations */
+    ol->prot_type = QB_PROT_FILE;
+    ol->prot_op.o_file.filename = filename1;
+    of->fmt_type = QB_FMT_NONE;
+    flag = LIBQBLOCK_O_NO_BACKING;
+    ret = qb_open(broker, qbs, ol, of, flag);
+    if (ret < 0) {
+        qb_error_get_human_str(broker, err_str, sizeof(err_str));
+        printf("info getting, open failed. %s.\n", err_str);
+        goto free;
+    }
+
+    while (1) {
+        ret = qb_info_image_static_get(broker, qbs, &info_st);
+        if (ret < 0) {
+            qb_error_get_human_str(broker, err_str, sizeof(err_str));
+            printf("info get error. %s.\n", err_str);
+            goto close;
+        }
+        print_info_image_static(info_st);
+        qb_close(broker, qbs);
+        if ((info_st->member_addr->backing_loc == NULL) ||
+            (info_st->member_addr->backing_loc->prot_type == QB_FMT_NONE)) {
+            break;
+        }
+        *ol = *(info_st->member_addr->backing_loc);
+        ret = qb_open(broker, qbs, ol, of, flag);
+        if (ret < 0) {
+            qb_error_get_human_str(broker, err_str, sizeof(err_str));
+            printf("info getting, open failed in backing file. %s.\n",
+                                                       err_str);
+            goto free;
+        }
+        qb_info_image_static_delete(broker, &info_st);
+    }
+    /* read and write the image */
+    ol->prot_type = QB_PROT_FILE;
+    ol->prot_op.o_file.filename = filename1;
+    of->fmt_type = QB_FMT_NONE;
+    flag = LIBQBLOCK_O_RDWR;
+    ret = qb_open(broker, qbs, ol, of, flag);
+    if (ret < 0) {
+        qb_error_get_human_str(broker, err_str, sizeof(err_str));
+        printf("open failed. %s.\n", err_str);
+        goto free;
+    }
+
+    buf_w[1] = 1;
+    buf_w[2] = 2;
+    buf_w[514] = 4;
+    memset(buf_r, 0, sizeof(buf_r));
+
+    ret = qb_write(broker, qbs, buf_w, test_len, test_offset);
+    if (ret < 0) {
+        qb_error_get_human_str(broker, err_str, sizeof(err_str));
+        printf("%s.\n", err_str);
+        goto close;
+    }
+
+    ret = qb_read(broker, qbs, buf_r, test_len, test_offset);
+    if (ret < 0) {
+        qb_error_get_human_str(broker, err_str, sizeof(err_str));
+        printf("%s.\n", err_str);
+        goto close;
+    }
+
+    test_check(&vdata);
+
+ close:
+    qb_close(broker, qbs);
+ unlink:
+    unlink(filename1);
+    unlink(filename2);
+ free:
+    if (info_st != NULL) {
+        qb_info_image_static_delete(broker, &info_st);
+    }
+    if (qbs != NULL) {
+        qb_state_delete(broker, &qbs);
+    }
+    if (ol != NULL) {
+        qb_prot_info_delete(broker, &ol);
+    }
+    if (of != NULL) {
+        qb_fmt_info_delete(broker, &of);
+    }
+    if (broker != NULL) {
+        qb_broker_delete(&broker);
+    }
     return 0;
 }
-- 
1.7.1