ceph之rbd读写API 测试

rados、rbd读写API测试：

//compile: 
//gcc ceph_test_v2.c  -lrbd -lrados  -g -Wall

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <rados/librados.h>
#include <rbd/librbd.h>

static int print_progress_percent(uint64_t offset, uint64_t src_size,void *data)
{
    float percent = ((float)offset*100)/src_size;
    printf("%3.2f%% done
", percent);
    return 0;
}

int main(int argc, char** argv)
{
    rados_t cluster;
    char cluster_name[] = "ceph";
    char user_name[] = "client.admin";
    uint64_t flags = 0;
    int i=0;

    rados_ioctx_t io; 
    char *poolname = "kvm";

    //Initialize the cluster handle with the "ceph" cluster name 
    //and the "client.admin" user name
    int rt_num;
    rt_num = rados_create2(&cluster, cluster_name, user_name, flags);
    if(rt_num<0){
        printf("%s: Couldn't create the cluster handle! %s
", argv[0], strerror(-rt_num));
        return -1; 
    }else{
        printf("
Created a cluster handle success. 
");
    }   
    
    //Read a ceph configuration file to configure the cluster handle
    rt_num = rados_conf_read_file(cluster, "/etc/ceph/ceph.conf");
    if(rt_num<0){
        printf("%s:can't read config file: %s
", argv[0], strerror(-rt_num));
        return -1;
    }else{
        printf("
Read the config file. 
");
    }

    //Read command line arguments
    /*
    rt_num = rados_conf_parse_argv(cluster, argc, argv);
    if(rt_num<0){
        printf("%s:cannot parse command line arguments:%s
", argv[0], strerror(-rt_num));
        return -1;
    }else{
        printf("
Read the command line arguments.
");
    }*/

    //Connect to the cluster
    rt_num = rados_connect(cluster);
    if(rt_num<0){
        printf("%s:cannot connect to cluster:%s
", argv[0], strerror(-rt_num));
        return -1;
    }else{
        printf("
Connected to the cluster.
");
    }

    //create io handle
    rt_num = rados_ioctx_create(cluster, poolname, &io);
    if(rt_num<0){
        printf("%s:cannot open rados pool %s:%s", argv[0], poolname, strerror(-rt_num));
        rados_shutdown(cluster);
        return -1;
    }else{
        printf("
Created I/O context. 
");
    }

    const char* name = "3400.img";
    const char* name_01 = "3000.img";
    /*const char* name_02 = "rbd_test_02.img";
    uint64_t size = 1073741824;
    uint64_t features = 1073741824;
    int order = 22;     //warning
    //int rbd_create2(rados_ioctx_t io, const char *name, uint64_t size, uint64_t features, int *order);
    rt_num = rbd_create( io, name, size, &order);
    if( rt_num ==0 ){
        printf("
rbd_create success !!
");
    }else{
        printf("
rbd_create failed !!%s
", strerror(-rt_num));
    }*/


    rbd_image_t image;
    //rbd_image_info_t info;
    //size_t  infosize;

    //rt_num = rbd_stat(image, &info, sizeof(info));
    //if(rt_num < 0){
    //  printf("rbd_stat error !!
");
    //}
    //printf("rbd_stat rt_num:%d, size:%d", rt_num, (int)info.size);

    //int rbd_remove_with_progress(rados_ioctx_t io, const char *name,librbd_progress_fn_t cb, void *cbdata);
    //librbd_progress_fn_t cb;
    //void* cbdata = NULL;
    printf("
remove img name:%s
", name_01);
    rt_num = rbd_remove_with_progress(io, name_01, print_progress_percent, NULL);
    if(rt_num ==0){
        printf("
rbd_remove success !!
");
    }

    //int rbd_open(rados_ioctx_t io, const char *name, rbd_image_t *image, const char *snap_name);
    rt_num = rbd_open( io, name, &image, NULL);
                                                     if( rt_num ==0 ){
        printf("
rbd_open success !!
");
    }else{
        printf("
rbd_open failed !!%s
", strerror(-rt_num));
    }

    size_t num = 156384;
    char* buf=(char*)malloc(num);
    char buf1[30]="";
    uint64_t ofs = 0;
    ssize_t  ok_size = 0;
    i = 10;
    //ssize_t rbd_write(rbd_image_t image, uint64_t ofs, size_t len, const char *buf);
    for(;i>0;i--){
        ok_size = rbd_write(image, ofs, num , buf);
        if(ok_size == num){
            ofs = ok_size + ofs;
            printf("rbd_write ok!! ofs: %lu
", ofs);
        }else{
            printf("rbd_write fail!!
");
        }
    }

    rbd_image_info_t info_tmp;
    rt_num = rbd_stat(image, &info_tmp, sizeof(info_tmp));
    if(rt_num < 0){
        printf("
rbd_stat failed %s
", name);
    }else{
        printf("
rbd_stat size :%d
", (int)info_tmp.size);
    }


    ofs = 0;
    rt_num = rbd_get_size(image, &ofs);
    if(rt_num >= 0){
        printf("
rbd_get_size %d
", (int)ofs);
    }
    printf("
rbd_get_size return_num: %d
", rt_num);
    ofs = 0;
    //ssize_t rbd_read(rbd_image_t image, uint64_t ofs, size_t len, char *buf);
    for(i=0;i<10;i++){
        ok_size = rbd_read(image, ofs, 10, buf1);
        if(ok_size >0){
            ofs = 10+ofs;
            printf("
the content is:%s", buf1);
        }else{
            printf("rbd_read fail!!
");
        }
    }

    //int rbd_aio_write(rbd_image_t image, uint64_t off, size_t len, const char *buf, rbd_completion_t c);
    //int rbd_aio_read(rbd_image_t image, uint64_t off, size_t len, char *buf, rbd_completion_t c);

    /*
     rt_num = rbd_open_read_only( io, name_01, image, NULL);
     if(rt_num == 0){
        printf("
rbd_open_read_only success !!
");
     }else{
        printf("
rbd_open_read_only fail !!
");
     }
    */



    rt_num = rbd_close(image);
    if(rt_num == 0){
        printf("
rbd_close success !!
");
    }else{
        printf("
rbd_close failed !!%s
", strerror(-rt_num));
    }

    printf("
Closing the connection
");
    rados_ioctx_destroy(io);
    printf("
Shut down the handle
");
    rados_shutdown(cluster);
    return 0;
}