linux-kernel - Re: [PATCH bpf 1/4] selftests: bpf: use a temporary file in test

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Message-ID: <20200123183427.wsmwuheq3wcw3usm@kafai-mbp.dhcp.thefacebook.com>
Date:   Thu, 23 Jan 2020 18:34:31 +0000
From:   Martin Lau <kafai@...com>
To:     Lorenz Bauer <lmb@...udflare.com>,
        John Fastabend <john.fastabend@...il.com>
CC:     Shuah Khan <shuah@...nel.org>, Alexei Starovoitov <ast@...nel.org>,
        "Daniel Borkmann" <daniel@...earbox.net>,
        Song Liu <songliubraving@...com>, "Yonghong Song" <yhs@...com>,
        Andrii Nakryiko <andriin@...com>,
        "linux-kselftest@...r.kernel.org" <linux-kselftest@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "bpf@...r.kernel.org" <bpf@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH bpf 1/4] selftests: bpf: use a temporary file in
 test_sockmap

On Thu, Jan 23, 2020 at 04:59:30PM +0000, Lorenz Bauer wrote:
> Use a proper temporary file for sendpage tests. This means that running
> the tests doesn't clutter the working directory, and allows running the
> test on read-only filesystems.
> 
> Signed-off-by: Lorenz Bauer <lmb@...udflare.com>
> ---
>  tools/testing/selftests/bpf/test_sockmap.c | 15 +++++----------
>  1 file changed, 5 insertions(+), 10 deletions(-)
> 
> diff --git a/tools/testing/selftests/bpf/test_sockmap.c b/tools/testing/selftests/bpf/test_sockmap.c
> index 4a851513c842..779e11da979c 100644
> --- a/tools/testing/selftests/bpf/test_sockmap.c
> +++ b/tools/testing/selftests/bpf/test_sockmap.c
> @@ -331,7 +331,7 @@ static int msg_loop_sendpage(int fd, int iov_length, int cnt,
>  	FILE *file;
>  	int i, fp;
>  
> -	file = fopen(".sendpage_tst.tmp", "w+");
> +	file = tmpfile();
>  	if (!file) {
>  		perror("create file for sendpage");
>  		return 1;
> @@ -340,13 +340,8 @@ static int msg_loop_sendpage(int fd, int iov_length, int cnt,
>  		fwrite(&k, sizeof(char), 1, file);
>  	fflush(file);
>  	fseek(file, 0, SEEK_SET);
> -	fclose(file);
>  
> -	fp = open(".sendpage_tst.tmp", O_RDONLY);
> -	if (fp < 0) {
> -		perror("reopen file for sendpage");
> -		return 1;
> -	}
> +	fp = fileno(file);
It may be better to keep fp == -1 check here.
It is not clear to me the original intention of reopen.
I would defer to John for comment.

>  
>  	clock_gettime(CLOCK_MONOTONIC, &s->start);
>  	for (i = 0; i < cnt; i++) {