Adding upstream version 4.19.249.upstream/4.19.249

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 189 insertions, 0 deletions

diff --git a/tools/perf/util/data.c b/tools/perf/util/data.c
new file mode 100644
index 000000000..d8cfc19dd
--- /dev/null
+++ b/tools/perf/util/data.c
@@ -0,0 +1,189 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/compiler.h>
+#include <linux/kernel.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <string.h>
+
+#include "data.h"
+#include "util.h"
+#include "debug.h"
+
+static bool check_pipe(struct perf_data *data)
+{
+	struct stat st;
+	bool is_pipe = false;
+	int fd = perf_data__is_read(data) ?
+		 STDIN_FILENO : STDOUT_FILENO;
+
+	if (!data->file.path) {
+		if (!fstat(fd, &st) && S_ISFIFO(st.st_mode))
+			is_pipe = true;
+	} else {
+		if (!strcmp(data->file.path, "-"))
+			is_pipe = true;
+	}
+
+	if (is_pipe)
+		data->file.fd = fd;
+
+	return data->is_pipe = is_pipe;
+}
+
+static int check_backup(struct perf_data *data)
+{
+	struct stat st;
+
+	if (!stat(data->file.path, &st) && st.st_size) {
+		/* TODO check errors properly */
+		char oldname[PATH_MAX];
+		snprintf(oldname, sizeof(oldname), "%s.old",
+			 data->file.path);
+		unlink(oldname);
+		rename(data->file.path, oldname);
+	}
+
+	return 0;
+}
+
+static int open_file_read(struct perf_data *data)
+{
+	struct stat st;
+	int fd;
+	char sbuf[STRERR_BUFSIZE];
+
+	fd = open(data->file.path, O_RDONLY);
+	if (fd < 0) {
+		int err = errno;
+
+		pr_err("failed to open %s: %s", data->file.path,
+			str_error_r(err, sbuf, sizeof(sbuf)));
+		if (err == ENOENT && !strcmp(data->file.path, "perf.data"))
+			pr_err("  (try 'perf record' first)");
+		pr_err("\n");
+		return -err;
+	}
+
+	if (fstat(fd, &st) < 0)
+		goto out_close;
+
+	if (!data->force && st.st_uid && (st.st_uid != geteuid())) {
+		pr_err("File %s not owned by current user or root (use -f to override)\n",
+		       data->file.path);
+		goto out_close;
+	}
+
+	if (!st.st_size) {
+		pr_info("zero-sized data (%s), nothing to do!\n",
+			data->file.path);
+		goto out_close;
+	}
+
+	data->size = st.st_size;
+	return fd;
+
+ out_close:
+	close(fd);
+	return -1;
+}
+
+static int open_file_write(struct perf_data *data)
+{
+	int fd;
+	char sbuf[STRERR_BUFSIZE];
+
+	if (check_backup(data))
+		return -1;
+
+	fd = open(data->file.path, O_CREAT|O_RDWR|O_TRUNC|O_CLOEXEC,
+		  S_IRUSR|S_IWUSR);
+
+	if (fd < 0)
+		pr_err("failed to open %s : %s\n", data->file.path,
+			str_error_r(errno, sbuf, sizeof(sbuf)));
+
+	return fd;
+}
+
+static int open_file(struct perf_data *data)
+{
+	int fd;
+
+	fd = perf_data__is_read(data) ?
+	     open_file_read(data) : open_file_write(data);
+
+	data->file.fd = fd;
+	return fd < 0 ? -1 : 0;
+}
+
+int perf_data__open(struct perf_data *data)
+{
+	if (check_pipe(data))
+		return 0;
+
+	if (!data->file.path)
+		data->file.path = "perf.data";
+
+	return open_file(data);
+}
+
+void perf_data__close(struct perf_data *data)
+{
+	close(data->file.fd);
+}
+
+ssize_t perf_data_file__write(struct perf_data_file *file,
+			      void *buf, size_t size)
+{
+	return writen(file->fd, buf, size);
+}
+
+ssize_t perf_data__write(struct perf_data *data,
+			      void *buf, size_t size)
+{
+	return perf_data_file__write(&data->file, buf, size);
+}
+
+int perf_data__switch(struct perf_data *data,
+			   const char *postfix,
+			   size_t pos, bool at_exit)
+{
+	char *new_filepath;
+	int ret;
+
+	if (check_pipe(data))
+		return -EINVAL;
+	if (perf_data__is_read(data))
+		return -EINVAL;
+
+	if (asprintf(&new_filepath, "%s.%s", data->file.path, postfix) < 0)
+		return -ENOMEM;
+
+	/*
+	 * Only fire a warning, don't return error, continue fill
+	 * original file.
+	 */
+	if (rename(data->file.path, new_filepath))
+		pr_warning("Failed to rename %s to %s\n", data->file.path, new_filepath);
+
+	if (!at_exit) {
+		close(data->file.fd);
+		ret = perf_data__open(data);
+		if (ret < 0)
+			goto out;
+
+		if (lseek(data->file.fd, pos, SEEK_SET) == (off_t)-1) {
+			ret = -errno;
+			pr_debug("Failed to lseek to %zu: %s",
+				 pos, strerror(errno));
+			goto out;
+		}
+	}
+	ret = data->file.fd;
+out:
+	free(new_filepath);
+	return ret;
+}