Re: [PATCH] ltp/fsstress: check mkdir(2) return value

[Eryu Guan <eguan@redhat.com>]

On Sat, Oct 14, 2017 at 03:07:17PM +0800, Xiong Zhou wrote:
> If mkdir(2) fails, the following chdir(2) would fail either.
> Although dirname and error message are printed, we don't know
> which operation has failed.
> 
> Like this:
> +/test2/fsstress.1582: No such file or directory
> 
> This trivial fix will check the return value and print detail
> error info if fail.
> 
> Signed-off-by: Xiong Zhou <xzhou@redhat.com>
> ---
>  ltp/fsstress.c | 15 ++++++++++++---
>  1 file changed, 12 insertions(+), 3 deletions(-)
> 
> diff --git a/ltp/fsstress.c b/ltp/fsstress.c
> index 96f48b1..1962d14 100644
> --- a/ltp/fsstress.c
> +++ b/ltp/fsstress.c
> @@ -493,7 +493,11 @@ int main(int argc, char **argv)
>              exit(1);
>          }
>  
> -	(void)mkdir(dirname, 0777);
> +	if (mkdir((const char *)dirname, 0777) < 0) {
> +		fprintf(stderr, "mkdir %s failed: %s\n", dirname,
> +			strerror(errno));
> +		exit(1);
> +	}

This changed current fsstress behavior and made some tests fail, e.g.
generic/013, because fsstress exited with EEXIST if there was a
pre-created test dir. e.g.

mkdir /mnt/test/fsstress
./ltp/fsstress -d /mnt/test/fsstress -n 10 -p 10 -v
mkdir /mnt/test/fsstress failed: File exists

>  	if (logname && logname[0] != '/') {
>  		if (getcwd(rpath, sizeof(rpath)) < 0){
>  			perror("getcwd failed");
> @@ -503,7 +507,8 @@ int main(int argc, char **argv)
>  		rpath[0] = '\0';
>  	}
>  	if (chdir(dirname) < 0) {
> -		perror(dirname);
> +		fprintf(stderr, "chdir %s failed: %s\n", dirname,
> +			strerror(errno));
>  		exit(1);
>  	}
>  	if (logname) {
> @@ -959,7 +964,11 @@ doproc(void)
>  
>  	dividend = (operations + execute_freq) / (execute_freq + 1);
>  	sprintf(buf, "p%x", procid);
> -	(void)mkdir(buf, 0777);
> +	if (mkdir((const char *)buf, 0777) < 0) {
> +		fprintf(stderr, "mkdir %s failed: %s\n", buf,
> +			strerror(errno));
> +		exit(1);
> +	}

Same here.

Thanks,
Eryu

>  	if (chdir(buf) < 0 || stat64(".", &statbuf) < 0) {
>  		perror(buf);
>  		_exit(1);
> -- 
> 1.8.3.1
> 
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