420 lines
7.6 KiB
C
420 lines
7.6 KiB
C
// 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 >= 1) {
|
|
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 = -1;
|
|
|
|
if (WARN_ON(!data->is_dir))
|
|
return -EINVAL;
|
|
|
|
files = zalloc(nr * sizeof(*files));
|
|
if (!files)
|
|
return -ENOMEM;
|
|
|
|
data->dir.version = PERF_DIR_VERSION;
|
|
data->dir.files = files;
|
|
data->dir.nr = nr;
|
|
|
|
for (i = 0; i < nr; i++) {
|
|
struct perf_data_file *file = &files[i];
|
|
|
|
if (asprintf(&file->path, "%s/data.%d", data->path, i) < 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;
|
|
}
|
|
|
|
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;
|
|
|
|
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", 4))
|
|
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;
|
|
}
|
|
|
|
if (!files)
|
|
return -EINVAL;
|
|
|
|
data->dir.files = files;
|
|
data->dir.nr = nr;
|
|
return 0;
|
|
|
|
out_err:
|
|
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/header", 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 (!data->is_dir)
|
|
return size;
|
|
|
|
for (i = 0; i < data->dir.nr; i++) {
|
|
struct perf_data_file *file = &data->dir.files[i];
|
|
|
|
size += file->size;
|
|
}
|
|
|
|
return size;
|
|
}
|