spdk_blob_set_xattr的代码案例以及参数说明-DPDK中文网

下面是一个示例代码，展示了如何使用SPDK库中的spdk_blob_set_xattr函数来设置blob对象的扩展属性：

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <spdk/blob.h>

void set_blob_xattr(struct spdk_blob *blob, const char *name, const void *value, size_t value_len)
{
    int rc;
    struct spdk_xattr_names *xattrs;

    // 获取blob对象的扩展属性列表
    xattrs = spdk_blob_get_xattr_names(blob);
    if (!xattrs) {
        fprintf(stderr, "Failed to get xattr names\n");
        return;
    }

    // 检查是否已存在同名扩展属性，若存在则删除
    if (spdk_xattr_names_find(xattrs, name) != NULL) {
        rc = spdk_blob_remove_xattr(blob, name);
        if (rc != 0) {
            fprintf(stderr, "Failed to remove existing xattr: %s\n", name);
            return;
        }
    }

    // 设置新的扩展属性
    rc = spdk_blob_set_xattr(blob, name, value, value_len);
    if (rc != 0) {
        fprintf(stderr, "Failed to set xattr: %s\n", name);
        return;
    }

    printf("Successfully set xattr: %s\n", name);
}

int main()
{
  	struct spdk_bs_opts opts = {};
	struct spdk_bs_dev *bs_dev;
	struct spdk_blob_store *bs;
	struct spdk_blob *blob;
	int rc;

	// 初始化SPDK库和块存储设备
	spdk_bs_opts_init(&opts);
	rc = spdk_bs_init(bs_dev, &opts);
	if (rc != 0) {
		fprintf(stderr, "Failed to initialize blobstore\n");
		return rc;
	}

	// 创建或打开一个blob存储
	rc = spdk_bs_create_blob(bs, NULL);
	if (rc < 0) {
		fprintf(stderr, "Failed to create/open blob\n");
		return rc;
	}
	blob = spdk_bs_open_blob(bs, rc);
	if (!blob) {
	    fprintf(stderr, "Failed to open blob\n");
	    return -1;
    }

    // 设置扩展属性
    const char *name = "user.custom_attr";
    const char *value = "example_value";
    size_t value_len = strlen(value);

    set_blob_xattr(blob, name, value, value_len);

    // 关闭和清理资源
	spdk_bs_unload(bs);
	spdk_bs_destroy(bs);
	spdk_bs_free_dev(bs_dev);

	return 0;
}

spdk_blob_set_xattr函数的参数说明如下：