[Qemu-devel] [PATCH v3 2/5] [RFC] libqblock, user example

[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
AIO on them.

Signed-off-by: Wenchao Xia <xiawenc@linux.vnet.ibm.com>
---
 libqblock/libqblock-test.c |  242 ++++++++++++++++++++++++++++++++++++++++++++
 1 files changed, 242 insertions(+), 0 deletions(-)
 create mode 100644 libqblock/libqblock-test.c

diff --git a/libqblock/libqblock-test.c b/libqblock/libqblock-test.c
new file mode 100644
index 0000000..b293185
--- /dev/null
+++ b/libqblock/libqblock-test.c
@@ -0,0 +1,242 @@
+#include <stdarg.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <inttypes.h>
+#include <string.h>
+
+#include "libqblock.h"
+
+static unsigned char buf_r[1024];
+static unsigned char buf_w[1024] = {4, 0, 0, 2};
+
+struct verify_data {
+    unsigned char *buf_r;
+    unsigned char *buf_w;
+    int len;
+};
+
+static void print_loc(struct QBlockOptionLoc *loc)
+{
+    switch (loc->prot_type) {
+    case QB_PROTO_NONE:
+        printf("protocol type [none].");
+        break;
+    case QB_PROTO_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(struct QBlockInfoImageStatic *info)
+{
+    printf("=======image location:\n");
+    print_loc(&info->loc);
+    printf("\nvirtual_size %" PRId64 ", format type %d,",
+           info->virt_size, info->fmt_type);
+    printf("allocated size %" PRId64 ", encrypt %d,",
+           info->allocated_size, info->encrypt);
+    printf("\nbacking image location:\n");
+    print_loc(&info->backing_loc);
+    printf("\n");
+}
+
+static void aio_test_w_cb(void *opaque, int ret)
+{
+    printf("aio write complete.\n");
+}
+
+static void aio_test_r_cb(void *opaque, int ret)
+{
+    struct verify_data *vdata;
+    int cmp;
+    printf("aio read complete.\n");
+    if (opaque != NULL) {
+        vdata = opaque;
+        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)
+{
+    char *filename1, *filename2;
+    struct QBroker *broker = NULL;
+    struct QBlockState *qbs = NULL;
+    struct QBlockOptionLoc *ol = NULL;
+    struct QBlockOptionFormat *of = NULL;
+    struct QBlockInfoImageStatic *info_st = NULL;
+    int ret, flag;
+    int test_offset = 0;
+    int test_len = 512;
+    struct verify_data vdata;
+    char err_str[1024];
+
+    vdata.buf_r = buf_r;
+    vdata.buf_w = buf_w;
+    vdata.len = test_len;
+
+    filename1 = argv[1];
+    filename2 = argv[2];
+    printf("qemu test, filename1 is %s, filename2 is %s.\n",
+                                       filename1, filename2);
+
+    libqblock_init();
+
+    ret = qb_broker_new(&broker);
+    if (ret < 0) {
+        goto free;
+    }
+
+    ret = qb_state_new(broker, &qbs);
+    if (ret < 0) {
+        goto free;
+    }
+
+    ret = qb_ol_new(broker, &ol);
+    if (ret < 0) {
+        goto free;
+    }
+
+    ret = qb_of_new(broker, &of);
+    if (ret < 0) {
+        goto free;
+    }
+
+    /* create a new image */
+
+    ol->prot_type = QB_PROTO_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_PROTO_FILE;
+    ol->prot_op.o_file.filename = filename1;
+    of->fmt_type = QB_FMT_QCOW2;
+    of->fmt_op.o_qcow2.backing_loc.prot_type = QB_PROTO_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_PROTO_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->backing_loc.prot_type == QB_FMT_NONE) {
+            break;
+        }
+        *ol = info_st->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_PROTO_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[24] = 3;
+    memset(buf_r, 0, sizeof(buf_r));
+
+    ret = qb_aio_write(broker, qbs, buf_w, test_len, test_offset,
+                       aio_test_w_cb, NULL, NULL);
+    if (ret < 0) {
+        qb_error_get_human_str(broker, err_str, sizeof(err_str));
+        printf("%s.\n", err_str);
+        goto close;
+    }
+
+    static int check_times = 1;
+    printf("checking aio status for %d times.\n", check_times);
+    while (true == qb_aio_check(broker)) {
+        check_times++;
+        usleep(1);
+    }
+
+    ret = qb_aio_read(broker, qbs, buf_r, test_len, test_offset,
+                      aio_test_r_cb, &vdata, NULL);
+    if (ret < 0) {
+        qb_error_get_human_str(broker, err_str, sizeof(err_str));
+        printf("%s.\n", err_str);
+        goto close;
+    }
+
+    printf("checking aio status for %d times.\n", check_times);
+    while (true == qb_aio_check(broker)) {
+        check_times++;
+        usleep(1);
+    }
+
+ 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_ol_delete(broker, &ol);
+    }
+    if (of != NULL) {
+        qb_of_delete(broker, &of);
+    }
+    if (broker != NULL) {
+        qb_broker_delete(&broker);
+    }
+    return 0;
+}
-- 
1.7.1