Re: [Qemu-devel] [PATCH 5/6] libqblock test example

[Blue Swirl <blauwirbel@gmail.com>]

On Mon, Sep 3, 2012 at 9:18 AM, Wenchao Xia <xiawenc@linux.vnet.ibm.com> wrote:
>   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 |  219 ++++++++++++++++++++++++++++++++++++++
>  1 files changed, 219 insertions(+), 0 deletions(-)
>  create mode 100644 tests/libqblock/libqblock-test.c
>
> diff --git a/tests/libqblock/libqblock-test.c b/tests/libqblock/libqblock-test.c
> new file mode 100644
> index 0000000..9a1eac5
> --- /dev/null
> +++ b/tests/libqblock/libqblock-test.c
> @@ -0,0 +1,219 @@
> +#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 {

VerifyData

> +    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 test_check(struct verify_data *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)
> +{
> +    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 = (char *)"./qemu_image1";
> +    filename2 = (char *)"./qemu_image2";

The casts remove 'const' qualifier, how can that be safe?

> +    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_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_ol_delete(broker, &ol);
> +    }
> +    if (of != NULL) {
> +        qb_of_delete(broker, &of);
> +    }
> +    if (broker != NULL) {
> +        qb_broker_delete(&broker);
> +    }
> +    return 0;
> +}
> --
> 1.7.1
>
>
>