From: Jiri Olsa <[email protected]> And display the error message from removing the old data file:
$ perf record ls Can't remove old data: Permission denied (perf.data.old) Perf session creation failed. $ perf record ls Can't remove old data: Unknown file found (perf.data.old) Perf session creation failed. Not sure how to make fail the rename (after we successfully remove the destination file/dir) to show the message, anyway let's have it there. Signed-off-by: Jiri Olsa <[email protected]> Tested-by: Arnaldo Carvalho de Melo <[email protected]> Cc: Adrian Hunter <[email protected]> Cc: Alexander Shishkin <[email protected]> Cc: Alexey Budankov <[email protected]> Cc: Andi Kleen <[email protected]> Cc: Namhyung Kim <[email protected]> Cc: Peter Zijlstra <[email protected]> Cc: Stephane Eranian <[email protected]> Link: http://lkml.kernel.org/r/[email protected] Signed-off-by: Arnaldo Carvalho de Melo <[email protected]> --- tools/perf/util/data.c | 21 ++++++++++++++++++--- 1 file changed, 18 insertions(+), 3 deletions(-) diff --git a/tools/perf/util/data.c b/tools/perf/util/data.c index bbf9a299615e..d008c3973012 100644 --- a/tools/perf/util/data.c +++ b/tools/perf/util/data.c @@ -41,12 +41,27 @@ static int check_backup(struct perf_data *data) return 0; if (!stat(data->path, &st) && st.st_size) { - /* TODO check errors properly */ char oldname[PATH_MAX]; + int ret; + snprintf(oldname, sizeof(oldname), "%s.old", data->path); - rm_rf_perf_data(oldname); - rename(data->path, oldname); + + ret = rm_rf_perf_data(oldname); + if (ret) { + pr_err("Can't remove old data: %s (%s)\n", + ret == -2 ? + "Unknown file found" : strerror(errno), + oldname); + return -1; + } + + if (rename(data->path, oldname)) { + pr_err("Can't move data: %s (%s to %s)\n", + strerror(errno), + data->path, oldname); + return -1; + } } return 0; -- 2.20.1
