去年寫了個librbd的讀寫demo，今天找了好久才找到，寫到部落格裡記錄下
熟悉librbd的介面，從乙個demo 開始是個不錯的選擇
/* 注釋就不詳細寫了，**比較簡單 */
#include #include #include #include rados_t init_rados() else
return rados;
}rados_ioctx_t init_ioctx(rados_t rados)
// 3. connect to ceph cluster
ret = rados_connect(rados);
if (ret < 0) else
// 4. init io context for rbd pool
const char *pool_name = "rbd";
ret = rados_ioctx_create(rados, pool_name, &io_ctx);
if (ret < 0) else
return io_ctx;
}rbd_image_t init_image(rados_ioctx_t io_ctx) else
return image;
}int get_rbd_size(rbd_image_t image) else
return size;
}void rbd_finish_aiocb(rbd_completion_t c, void *arg)
int aio_write(rbd_image_t image, const char *buff)
int len = strlen(buff);
ret = rbd_aio_write(image, off, len, buff, c);
if (ret < 0)
printf("write %s to image end\n", buff);
return ret;
}int aio_read(rbd_image_t image, char *buff)
memset(buff, 0, 128);
ret = rbd_aio_read(image, off, len, buff, c);
if (ret < 0)
printf("read from image end\n");
return ret;
}int main() ;
int len;
rados_t rados = init_rados();
if (!rados)
rados_ioctx_t io_ctx = init_ioctx(rados);
if (!io_ctx)
rbd_image_t image = init_image(io_ctx);
if (!image)
int size = get_rbd_size(image);
printf("image size: %d\n", size);
sprintf(buff, "%s", "abcd123efg");
aio_write(image, buff);
aio_read(image, buff);
// 7. close image, io context and rados object
ret = rbd_close(image);
if (ret < 0) else
rados_ioctx_destroy(io_ctx);
rados_shutdown(rados);
return 0;
}
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