// SPDX-License-Identifier: GPL-2.0#include <linux/compiler.h>#include <linux/kernel.h>#include <linux/string.h>#include <linux/zalloc.h>#include <linux/err.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 "rlimit.h"#include <internal/lib.h> static void perf_data_file__close(struct perf_data_file *file){	if (file->use_stdio) {		if (file->fptr) {			fclose(file->fptr);			file->fptr = NULL;		}	} else {		close(file->fd);		file->fd = -1;	}	zfree(&file->path);} static void close_dir(struct perf_data_file *files, int nr){	while (--nr >= 0)		perf_data_file__close(&files[nr]); 	free(files);} void perf_data__close_dir(struct perf_data *data){	close_dir(data->dir.files, data->dir.nr);	data->dir.files = NULL;	data->dir.nr = 0;} int perf_data__create_dir(struct perf_data *data, int nr){	enum rlimit_action set_rlimit = NO_CHANGE;	struct perf_data_file *files = NULL;	int i, ret; 	if (WARN_ON(!data->is_dir))		return -EINVAL; 	files = calloc(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) {			ret = -ENOMEM;			goto out_err;		} retry_open:		ret = open(file->path, O_RDWR|O_CREAT|O_TRUNC, S_IRUSR|S_IWUSR);		if (ret < 0) {			/*			 * If using parallel threads to collect data,			 * perf record needs at least 6 fds per CPU.			 * When we run out of them try to increase the limits.			 */			if (errno == EMFILE && rlimit__increase_nofile(&set_rlimit))				goto retry_open; 			ret = -errno;			goto out_err;		}		set_rlimit = NO_CHANGE; 		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 = (struct perf_data_file){			.path = strdup(path),			.fd = -1,			.size = st.st_size,			.use_stdio = false,		};		if (!file->path)			goto out_err; 		ret = open(file->path, O_RDONLY);		if (ret < 0) {			ret = -errno;			goto out_err;		}		file->fd = ret;	} 	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;} 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) {		if (data->file.use_stdio) {			const char *mode; 			mode = perf_data__is_read(data) ? "r" : "w";			data->file.fptr = fdopen(fd, mode); 			if (data->file.fptr == NULL) {				data->file.fd = fd;				data->file.use_stdio = false;			} 		/*		 * When is_pipe and data->file.fd is given, use given fd		 * instead of STDIN_FILENO or STDOUT_FILENO		 */		} else if (data->file.fd <= 0) {			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) {			if (ret == -2)				pr_err("Can't remove old data: Unknown file found (%s)\n", oldname);			else				pr_err("Can't remove old data: %m (%s)\n", oldname);			return -1;		} 		if (rename(data->path, oldname)) {			pr_err("Can't move data: %m (%s to %s)\n", 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){	int flags = data->in_place_update ? O_RDWR : O_RDONLY;	struct stat st;	int fd; 	fd = open(data->file.path, flags);	if (fd < 0) {		int err = errno; 		pr_err("failed to open %s: %m", data->file.path);		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 = 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 : %m\n", data->file.path); 	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; 	/* currently it allows stdio for pipe only */	data->file.use_stdio = false; 	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); 	perf_data_file__close(&data->file);} static ssize_t perf_data_file__read(struct perf_data_file *file, void *buf, size_t size){	if (file->use_stdio) {		if (fread(buf, size, 1, file->fptr) == 1)			return size;		return feof(file->fptr) ? 0 : -1;	}	return readn(file->fd, buf, size);} ssize_t perf_data__read(struct perf_data *data, void *buf, size_t size){	return perf_data_file__read(&data->file, buf, size);} ssize_t perf_data_file__write(struct perf_data_file *file,			      void *buf, size_t size){	if (file->use_stdio) {		if (fwrite(buf, size, /*nmemb=*/1, file->fptr) == 1)			return size;		return -1;	}	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);} off_t perf_data_file__seek(struct perf_data_file *file, off_t offset, int whence){	if (file->use_stdio) {		off_t res = fseeko(file->fptr, offset, whence); 		return res < 0 ? -1 : ftello(file->fptr);	}	return lseek(file->fd, offset, whence);} off_t perf_data__seek(struct perf_data *data, off_t offset, int whence){	/* Note, a pipe fd will fail with -1 with errno of ESPIPE. */	return perf_data_file__seek(&data->file, offset, whence);} int perf_data__switch(struct perf_data *data,		      const char *postfix,		      size_t pos, bool at_exit,		      char **new_filepath){	int ret; 	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) {		perf_data_file__close(&data->file);		ret = perf_data__open(data);		if (ret < 0)			goto out; 		if (perf_data__seek(data, pos, SEEK_SET) == (off_t)-1) {			ret = -errno;			pr_debug("Failed to seek to %zu: %m", pos);			goto out;		}	}	ret = perf_data__fd(data);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)

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