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perf build-id: Add check for existing link in buildid dir 

When adding new build id link we fail if the link is already there.
Adding check for existing link and output debug message that the build
id is already linked.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Alexey Budankov <alexey.budankov@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Michael Petlan <mpetlan@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Song Liu <songliubraving@fb.com>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lore.kernel.org/lkml/20201126170026.2619053-11-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Jiri Olsa 2020-11-26 18:00:11 +01:00 committed by Arnaldo Carvalho de Melo
parent 7ac22b088a
commit af21c579c8
1 changed files with 18 additions and 1 deletions
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19
tools/perf/util/build-id.c
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@ -755,8 +755,25 @@ int build_id_cache__add_s(const char *sbuild_id, const char *name,
tmp = dir_name + strlen(buildid_dir) - 5;
memcpy(tmp, "../..", 5);
if (symlink(tmp, linkname) == 0)
if (symlink(tmp, linkname) == 0) {
err = 0;
} else if (errno == EEXIST) {
char path[PATH_MAX];
ssize_t len;
len = readlink(linkname, path, sizeof(path) - 1);
if (len <= 0) {
pr_err("Cant read link: %s\n", linkname);
goto out_free;
}
path[len] = '\0';
if (strcmp(tmp, path)) {
pr_debug("build <%s> already linked to %s\n",
sbuild_id, linkname);
}
err = 0;
}
/* Update SDT cache : error is just warned */
if (realname &&