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SubjectRe: [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@jouet 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@jouet perf]$

Thanks,

- Arnaldo

> Reported-by: Michael Petlan <mpetlan@redhat.com>
> Link: http://lkml.kernel.org/n/tip-hgwpktyrx657m1i255da46p0@git.kernel.org
> Signed-off-by: Jiri Olsa <jolsa@kernel.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

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