linux-kernel - [tip:perf/core] perf symbols: Use lsdir() for the search in kcore cache directory

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Date:	Thu, 12 May 2016 03:26:00 -0700
From:	tip-bot for Masami Hiramatsu <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hemant@...ux.vnet.ibm.com,
	ananth@...ux.vnet.ibm.com, peterz@...radead.org,
	mhiramat@...nel.org, acme@...hat.com, hpa@...or.com,
	mingo@...nel.org, brendan.d.gregg@...il.com, namhyung@...nel.org,
	tglx@...utronix.de
Subject: [tip:perf/core] perf symbols: Use lsdir() for the search in kcore
 cache directory

Commit-ID:  c48903b816e6cdffb09b473352851bf199d0c582
Gitweb:     http://git.kernel.org/tip/c48903b816e6cdffb09b473352851bf199d0c582
Author:     Masami Hiramatsu <mhiramat@...nel.org>
AuthorDate: Wed, 11 May 2016 22:52:08 +0900
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Wed, 11 May 2016 13:06:07 -0300

perf symbols: Use lsdir() for the search in kcore cache directory

Use lsdir() to search in kcore cache directory. This also avoids
checking hidden dot directory entries, because kcore cache directories
must always have the name from timestamps when taking the kcore
snapshots, and it never start with dot.

Signed-off-by: Masami Hiramatsu <mhiramat@...nel.org>
Cc: Ananth N Mavinakayanahalli <ananth@...ux.vnet.ibm.com>
Cc: Brendan Gregg <brendan.d.gregg@...il.com>
Cc: Hemant Kumar <hemant@...ux.vnet.ibm.com>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Link: http://lkml.kernel.org/r/20160511135208.23943.68071.stgit@devbox
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/util/symbol.c | 26 ++++++++++++++------------
 1 file changed, 14 insertions(+), 12 deletions(-)

diff --git a/tools/perf/util/symbol.c b/tools/perf/util/symbol.c
index 4ada5a4..7fb3330 100644
--- a/tools/perf/util/symbol.c
+++ b/tools/perf/util/symbol.c
@@ -1608,25 +1608,27 @@ out:
 	return err;
 }
 
+static bool visible_dir_filter(const char *name, struct dirent *d)
+{
+	if (d->d_type != DT_DIR)
+		return false;
+	return lsdir_no_dot_filter(name, d);
+}
+
 static int find_matching_kcore(struct map *map, char *dir, size_t dir_sz)
 {
 	char kallsyms_filename[PATH_MAX];
-	struct dirent *dent;
 	int ret = -1;
-	DIR *d;
+	struct strlist *dirs;
+	struct str_node *nd;
 
-	d = opendir(dir);
-	if (!d)
+	dirs = lsdir(dir, visible_dir_filter);
+	if (!dirs)
 		return -1;
 
-	while (1) {
-		dent = readdir(d);
-		if (!dent)
-			break;
-		if (dent->d_type != DT_DIR)
-			continue;
+	strlist__for_each(nd, dirs) {
 		scnprintf(kallsyms_filename, sizeof(kallsyms_filename),
-			  "%s/%s/kallsyms", dir, dent->d_name);
+			  "%s/%s/kallsyms", dir, nd->s);
 		if (!validate_kcore_addresses(kallsyms_filename, map)) {
 			strlcpy(dir, kallsyms_filename, dir_sz);
 			ret = 0;
@@ -1634,7 +1636,7 @@ static int find_matching_kcore(struct map *map, char *dir, size_t dir_sz)
 		}
 	}
 
-	closedir(d);
+	strlist__delete(dirs);
 
 	return ret;
 }