summaryrefslogtreecommitdiffstats
path: root/tools/perf/util/data.c
diff options
context:
space:
mode:
Diffstat (limited to 'tools/perf/util/data.c')
-rw-r--r--tools/perf/util/data.c461
1 files changed, 461 insertions, 0 deletions
diff --git a/tools/perf/util/data.c b/tools/perf/util/data.c
new file mode 100644
index 000000000..29d32ba04
--- /dev/null
+++ b/tools/perf/util/data.c
@@ -0,0 +1,461 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <linux/compiler.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/zalloc.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <string.h>
+#include <asm/bug.h>
+#include <dirent.h>
+
+#include "data.h"
+#include "util.h" // rm_rf_perf_data()
+#include "debug.h"
+#include "header.h"
+#include <internal/lib.h>
+
+static void close_dir(struct perf_data_file *files, int nr)
+{
+ while (--nr >= 0) {
+ close(files[nr].fd);
+ zfree(&files[nr].path);
+ }
+ free(files);
+}
+
+void perf_data__close_dir(struct perf_data *data)
+{
+ close_dir(data->dir.files, data->dir.nr);
+}
+
+int perf_data__create_dir(struct perf_data *data, int nr)
+{
+ struct perf_data_file *files = NULL;
+ int i, ret;
+
+ if (WARN_ON(!data->is_dir))
+ return -EINVAL;
+
+ files = zalloc(nr * sizeof(*files));
+ if (!files)
+ return -ENOMEM;
+
+ for (i = 0; i < nr; i++) {
+ struct perf_data_file *file = &files[i];
+
+ ret = asprintf(&file->path, "%s/data.%d", data->path, i);
+ if (ret < 0)
+ goto out_err;
+
+ ret = open(file->path, O_RDWR|O_CREAT|O_TRUNC, S_IRUSR|S_IWUSR);
+ if (ret < 0)
+ goto out_err;
+
+ file->fd = ret;
+ }
+
+ data->dir.version = PERF_DIR_VERSION;
+ data->dir.files = files;
+ data->dir.nr = nr;
+ return 0;
+
+out_err:
+ close_dir(files, i);
+ return ret;
+}
+
+int perf_data__open_dir(struct perf_data *data)
+{
+ struct perf_data_file *files = NULL;
+ struct dirent *dent;
+ int ret = -1;
+ DIR *dir;
+ int nr = 0;
+
+ /*
+ * Directory containing a single regular perf data file which is already
+ * open, means there is nothing more to do here.
+ */
+ if (perf_data__is_single_file(data))
+ return 0;
+
+ if (WARN_ON(!data->is_dir))
+ return -EINVAL;
+
+ /* The version is provided by DIR_FORMAT feature. */
+ if (WARN_ON(data->dir.version != PERF_DIR_VERSION))
+ return -1;
+
+ dir = opendir(data->path);
+ if (!dir)
+ return -EINVAL;
+
+ while ((dent = readdir(dir)) != NULL) {
+ struct perf_data_file *file;
+ char path[PATH_MAX];
+ struct stat st;
+
+ snprintf(path, sizeof(path), "%s/%s", data->path, dent->d_name);
+ if (stat(path, &st))
+ continue;
+
+ if (!S_ISREG(st.st_mode) || strncmp(dent->d_name, "data.", 5))
+ continue;
+
+ ret = -ENOMEM;
+
+ file = realloc(files, (nr + 1) * sizeof(*files));
+ if (!file)
+ goto out_err;
+
+ files = file;
+ file = &files[nr++];
+
+ file->path = strdup(path);
+ if (!file->path)
+ goto out_err;
+
+ ret = open(file->path, O_RDONLY);
+ if (ret < 0)
+ goto out_err;
+
+ file->fd = ret;
+ file->size = st.st_size;
+ }
+
+ closedir(dir);
+ if (!files)
+ return -EINVAL;
+
+ data->dir.files = files;
+ data->dir.nr = nr;
+ return 0;
+
+out_err:
+ closedir(dir);
+ close_dir(files, nr);
+ return ret;
+}
+
+int perf_data__update_dir(struct perf_data *data)
+{
+ int i;
+
+ if (WARN_ON(!data->is_dir))
+ return -EINVAL;
+
+ for (i = 0; i < data->dir.nr; i++) {
+ struct perf_data_file *file = &data->dir.files[i];
+ struct stat st;
+
+ if (fstat(file->fd, &st))
+ return -1;
+
+ file->size = st.st_size;
+ }
+
+ return 0;
+}
+
+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->path) {
+ if (!fstat(fd, &st) && S_ISFIFO(st.st_mode))
+ is_pipe = true;
+ } else {
+ if (!strcmp(data->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 (perf_data__is_read(data))
+ return 0;
+
+ if (!stat(data->path, &st) && st.st_size) {
+ char oldname[PATH_MAX];
+ int ret;
+
+ snprintf(oldname, sizeof(oldname), "%s.old",
+ data->path);
+
+ 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;
+}
+
+static bool is_dir(struct perf_data *data)
+{
+ struct stat st;
+
+ if (stat(data->path, &st))
+ return false;
+
+ return (st.st_mode & S_IFMT) == S_IFDIR;
+}
+
+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->file.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];
+
+ 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);
+
+ if (fd < 0) {
+ zfree(&data->file.path);
+ return -1;
+ }
+
+ data->file.fd = fd;
+ return 0;
+}
+
+static int open_file_dup(struct perf_data *data)
+{
+ data->file.path = strdup(data->path);
+ if (!data->file.path)
+ return -ENOMEM;
+
+ return open_file(data);
+}
+
+static int open_dir(struct perf_data *data)
+{
+ int ret;
+
+ /*
+ * So far we open only the header, so we can read the data version and
+ * layout.
+ */
+ if (asprintf(&data->file.path, "%s/data", data->path) < 0)
+ return -1;
+
+ if (perf_data__is_write(data) &&
+ mkdir(data->path, S_IRWXU) < 0)
+ return -1;
+
+ ret = open_file(data);
+
+ /* Cleanup whatever we managed to create so far. */
+ if (ret && perf_data__is_write(data))
+ rm_rf_perf_data(data->path);
+
+ return ret;
+}
+
+int perf_data__open(struct perf_data *data)
+{
+ if (check_pipe(data))
+ return 0;
+
+ if (!data->path)
+ data->path = "perf.data";
+
+ if (check_backup(data))
+ return -1;
+
+ if (perf_data__is_read(data))
+ data->is_dir = is_dir(data);
+
+ return perf_data__is_dir(data) ?
+ open_dir(data) : open_file_dup(data);
+}
+
+void perf_data__close(struct perf_data *data)
+{
+ if (perf_data__is_dir(data))
+ perf_data__close_dir(data);
+
+ zfree(&data->file.path);
+ 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->path, postfix) < 0)
+ return -ENOMEM;
+
+ /*
+ * Only fire a warning, don't return error, continue fill
+ * original file.
+ */
+ if (rename(data->path, *new_filepath))
+ pr_warning("Failed to rename %s to %s\n", data->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:
+ return ret;
+}
+
+unsigned long perf_data__size(struct perf_data *data)
+{
+ u64 size = data->file.size;
+ int i;
+
+ if (perf_data__is_single_file(data))
+ return size;
+
+ for (i = 0; i < data->dir.nr; i++) {
+ struct perf_data_file *file = &data->dir.files[i];
+
+ size += file->size;
+ }
+
+ return size;
+}
+
+int perf_data__make_kcore_dir(struct perf_data *data, char *buf, size_t buf_sz)
+{
+ int ret;
+
+ if (!data->is_dir)
+ return -1;
+
+ ret = snprintf(buf, buf_sz, "%s/kcore_dir", data->path);
+ if (ret < 0 || (size_t)ret >= buf_sz)
+ return -1;
+
+ return mkdir(buf, S_IRWXU);
+}
+
+char *perf_data__kallsyms_name(struct perf_data *data)
+{
+ char *kallsyms_name;
+ struct stat st;
+
+ if (!data->is_dir)
+ return NULL;
+
+ if (asprintf(&kallsyms_name, "%s/kcore_dir/kallsyms", data->path) < 0)
+ return NULL;
+
+ if (stat(kallsyms_name, &st)) {
+ free(kallsyms_name);
+ return NULL;
+ }
+
+ return kallsyms_name;
+}