linux-kernel - Re: [PATCH] perf tests: Handle properly readdir DT

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Date:   Thu, 7 Dec 2017 12:19:05 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Jiri Olsa <jolsa@...nel.org>
Cc:     lkml <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        David Ahern <dsahern@...il.com>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Michael Petlan <mpetlan@...hat.com>
Subject: Re: [PATCH] perf tests: Handle properly readdir DT_UNKNOWN

Em Wed, Dec 06, 2017 at 06:45:35PM +0100, Jiri Olsa escreveu:
> Some system can return DT_UNKNOWN in readdir's struct dirent::d_type
> and we must handle it properly. In this case we can directly check
> if the entity we found is directory and skip it.
 
> Making is_directory function global.

Split this part into a prep patch and left with the previous paragraph
the 'perf test' bits.

[acme@...et perf]$ git log --oneline -2
de7cee586145 (HEAD -> perf/core, acme.korg/perf/core) perf test: Handle properly readdir DT_UNKNOWN
ef87e1133606 perf utils: Move is_directory() to path.h
[acme@...et perf]$

Thanks,

- Arnaldo
 
> Reported-by: Michael Petlan <mpetlan@...hat.com>
> Link: http://lkml.kernel.org/n/tip-hgwpktyrx657m1i255da46p0@git.kernel.org
> Signed-off-by: Jiri Olsa <jolsa@...nel.org>
> ---
>  tools/perf/builtin-script.c     | 14 +-------------
>  tools/perf/tests/builtin-test.c | 10 +++++-----
>  tools/perf/util/path.c          | 13 +++++++++++++
>  tools/perf/util/path.h          |  4 ++++
>  4 files changed, 23 insertions(+), 18 deletions(-)
> 
> diff --git a/tools/perf/builtin-script.c b/tools/perf/builtin-script.c
> index 39d8b55f0db3..a5c1361ccf26 100644
> --- a/tools/perf/builtin-script.c
> +++ b/tools/perf/builtin-script.c
> @@ -26,6 +26,7 @@
>  #include "util/string2.h"
>  #include "util/thread-stack.h"
>  #include "util/time-utils.h"
> +#include "util/path.h"
>  #include "print_binary.h"
>  #include <linux/bitmap.h>
>  #include <linux/kernel.h>
> @@ -2399,19 +2400,6 @@ static int parse_output_fields(const struct option *opt __maybe_unused,
>  	return rc;
>  }
>  
> -/* Helper function for filesystems that return a dent->d_type DT_UNKNOWN */
> -static int is_directory(const char *base_path, const struct dirent *dent)
> -{
> -	char path[PATH_MAX];
> -	struct stat st;
> -
> -	sprintf(path, "%s/%s", base_path, dent->d_name);
> -	if (stat(path, &st))
> -		return 0;
> -
> -	return S_ISDIR(st.st_mode);
> -}
> -
>  #define for_each_lang(scripts_path, scripts_dir, lang_dirent)		\
>  	while ((lang_dirent = readdir(scripts_dir)) != NULL)		\
>  		if ((lang_dirent->d_type == DT_DIR ||			\
> diff --git a/tools/perf/tests/builtin-test.c b/tools/perf/tests/builtin-test.c
> index 766573e236e4..fafa014240cd 100644
> --- a/tools/perf/tests/builtin-test.c
> +++ b/tools/perf/tests/builtin-test.c
> @@ -411,9 +411,9 @@ static const char *shell_test__description(char *description, size_t size,
>  	return description ? trim(description + 1) : NULL;
>  }
>  
> -#define for_each_shell_test(dir, ent)		\
> +#define for_each_shell_test(dir, base, ent)	\
>  	while ((ent = readdir(dir)) != NULL)	\
> -		if (ent->d_type == DT_REG && ent->d_name[0] != '.')
> +		if (!is_directory(base, ent))
>  
>  static const char *shell_tests__dir(char *path, size_t size)
>  {
> @@ -452,7 +452,7 @@ static int shell_tests__max_desc_width(void)
>  	if (!dir)
>  		return -1;
>  
> -	for_each_shell_test(dir, ent) {
> +	for_each_shell_test(dir, path, ent) {
>  		char bf[256];
>  		const char *desc = shell_test__description(bf, sizeof(bf), path, ent->d_name);
>  
> @@ -504,7 +504,7 @@ static int run_shell_tests(int argc, const char *argv[], int i, int width)
>  	if (!dir)
>  		return -1;
>  
> -	for_each_shell_test(dir, ent) {
> +	for_each_shell_test(dir, st.dir, ent) {
>  		int curr = i++;
>  		char desc[256];
>  		struct test test = {
> @@ -614,7 +614,7 @@ static int perf_test__list_shell(int argc, const char **argv, int i)
>  	if (!dir)
>  		return -1;
>  
> -	for_each_shell_test(dir, ent) {
> +	for_each_shell_test(dir, path, ent) {
>  		int curr = i++;
>  		char bf[256];
>  		struct test t = {
> diff --git a/tools/perf/util/path.c b/tools/perf/util/path.c
> index 933f5c6bffb4..ab1be320f3ef 100644
> --- a/tools/perf/util/path.c
> +++ b/tools/perf/util/path.c
> @@ -77,3 +77,16 @@ bool is_regular_file(const char *file)
>  
>  	return S_ISREG(st.st_mode);
>  }
> +
> +/* Helper function for filesystems that return a dent->d_type DT_UNKNOWN */
> +bool is_directory(const char *base_path, const struct dirent *dent)
> +{
> +	char path[PATH_MAX];
> +	struct stat st;
> +
> +	sprintf(path, "%s/%s", base_path, dent->d_name);
> +	if (stat(path, &st))
> +		return false;
> +
> +	return S_ISDIR(st.st_mode);
> +}
> diff --git a/tools/perf/util/path.h b/tools/perf/util/path.h
> index 14a254ada7eb..f0f3a6bedc57 100644
> --- a/tools/perf/util/path.h
> +++ b/tools/perf/util/path.h
> @@ -2,9 +2,13 @@
>  #ifndef _PERF_PATH_H
>  #define _PERF_PATH_H
>  
> +#include <sys/types.h>
> +#include <dirent.h>
> +
>  int path__join(char *bf, size_t size, const char *path1, const char *path2);
>  int path__join3(char *bf, size_t size, const char *path1, const char *path2, const char *path3);
>  
>  bool is_regular_file(const char *file);
> +bool is_directory(const char *base_path, const struct dirent *dent);
>  
>  #endif /* _PERF_PATH_H */
> -- 
> 2.13.6