linux-kernel - Re: [PATCH core v2] perf data: Adding error message if perf_data__create

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Date:   Tue, 22 Feb 2022 23:06:02 +0100
From:   Jiri Olsa <olsajiri@...il.com>
To:     Alexey Bayduraev <alexey.v.bayduraev@...ux.intel.com>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Alexander Antonov <alexander.antonov@...ux.intel.com>,
        Alexei Budankov <abudankov@...wei.com>
Subject: Re: [PATCH core v2] perf data: Adding error message if
 perf_data__create_dir fails

On Tue, Feb 22, 2022 at 12:14:17PM +0300, Alexey Bayduraev wrote:
> Adding proper return codes for all cases of data directory creation
> failure and adding error message output based on these codes.
> 
> Signed-off-by: Alexey Bayduraev <alexey.v.bayduraev@...ux.intel.com>

Acked-by: Jiri Olsa <jolsa@...nel.org>

thanks,
jirka

> ---
>  tools/perf/builtin-record.c | 4 +++-
>  tools/perf/util/data.c      | 8 ++++++--
>  2 files changed, 9 insertions(+), 3 deletions(-)
> 
> diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
> index 0bc6529814b2..0b4abed555d8 100644
> --- a/tools/perf/builtin-record.c
> +++ b/tools/perf/builtin-record.c
> @@ -1186,8 +1186,10 @@ static int record__mmap_evlist(struct record *rec,
>  
>  	if (record__threads_enabled(rec)) {
>  		ret = perf_data__create_dir(&rec->data, evlist->core.nr_mmaps);
> -		if (ret)
> +		if (ret) {
> +			pr_err("Failed to create data directory: %s\n", strerror(-ret));
>  			return ret;
> +		}
>  		for (i = 0; i < evlist->core.nr_mmaps; i++) {
>  			if (evlist->mmap)
>  				evlist->mmap[i].file = &rec->data.dir.files[i];
> diff --git a/tools/perf/util/data.c b/tools/perf/util/data.c
> index f5d260b1df4d..dc5d82ea1c30 100644
> --- a/tools/perf/util/data.c
> +++ b/tools/perf/util/data.c
> @@ -52,12 +52,16 @@ int perf_data__create_dir(struct perf_data *data, int nr)
>  		struct perf_data_file *file = &files[i];
>  
>  		ret = asprintf(&file->path, "%s/data.%d", data->path, i);
> -		if (ret < 0)
> +		if (ret < 0) {
> +			ret = -ENOMEM;
>  			goto out_err;
> +		}
>  
>  		ret = open(file->path, O_RDWR|O_CREAT|O_TRUNC, S_IRUSR|S_IWUSR);
> -		if (ret < 0)
> +		if (ret < 0) {
> +			ret = -errno;
>  			goto out_err;
> +		}
>  
>  		file->fd = ret;
>  	}
> -- 
> 2.19.0
>