[linux-2.6-block.git] / tools / perf / util / data.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;

	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];

		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;
	}

	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;
	}

	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) {
		if (data->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->use_stdio = false;
			}
		} else {
			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;

	/* currently it allows stdio for pipe only */
	data->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);

	zfree(&data->file.path);

	if (data->use_stdio)
		fclose(data->file.fptr);
	else
		close(data->file.fd);
}

ssize_t perf_data__read(struct perf_data *data, void *buf, size_t size)
{
	if (data->use_stdio) {
		if (fread(buf, size, 1, data->file.fptr) == 1)
			return size;
		return feof(data->file.fptr) ? 0 : -1;
	}
	return readn(data->file.fd, buf, size);
}

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)
{
	if (data->use_stdio) {
		if (fwrite(buf, size, 1, data->file.fptr) == 1)
			return size;
		return -1;
	}
	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;
}

bool is_perf_data(const char *path)
{
	bool ret = false;
	FILE *file;
	u64 magic;

	file = fopen(path, "r");
	if (!file)
		return false;

	if (fread(&magic, 1, 8, file) < 8)
		goto out;

	ret = is_perf_magic(magic);
out:
	fclose(file);
	return ret;
}
Commit	Line	Data
b2441318	1	// SPDX-License-Identifier: GPL-2.0
6a4d98d7 JO	2	#include <linux/compiler.h>
6a4d98d7 JO	3	#include <linux/kernel.h>
8520a98d	4	#include <linux/string.h>
7f7c536f	5	#include <linux/zalloc.h>
6a4d98d7 JO	6	#include <sys/types.h>
6a4d98d7 JO	7	#include <sys/stat.h>
a43783ae	8	#include <errno.h>
c23c2a0f	9	#include <fcntl.h>
6a4d98d7 JO	10	#include <unistd.h>
6a4d98d7 JO	11	#include <string.h>
14552063	12	#include <asm/bug.h>
eb617670	13	#include <dirent.h>
6a4d98d7 JO	14
6a4d98d7 JO	15	#include "data.h"
fb71c86c	16	#include "util.h" // rm_rf_perf_data()
84f5d36f	17	#include "debug.h"
258031c0	18	#include "header.h"
fb71c86c	19	#include <internal/lib.h>
6a4d98d7	20
14552063 JO	21	static void close_dir(struct perf_data_file *files, int nr)
	22	{
	23	while (--nr >= 1) {
	24	close(files[nr].fd);
d8f9da24	25	zfree(&files[nr].path);
14552063 JO	26	}
	27	free(files);
	28	}
	29
	30	void perf_data__close_dir(struct perf_data *data)
	31	{
	32	close_dir(data->dir.files, data->dir.nr);
	33	}
	34
	35	int perf_data__create_dir(struct perf_data *data, int nr)
	36	{
	37	struct perf_data_file *files = NULL;
f2211881	38	int i, ret;
14552063	39
ec65def1 JO	40	if (WARN_ON(!data->is_dir))
	41	return -EINVAL;
	42
14552063 JO	43	files = zalloc(nr * sizeof(*files));
	44	if (!files)
	45	return -ENOMEM;
	46
258031c0 JO	47	data->dir.version = PERF_DIR_VERSION;
	48	data->dir.files = files;
	49	data->dir.nr = nr;
14552063 JO	50
	51	for (i = 0; i < nr; i++) {
	52	struct perf_data_file *file = &files[i];
	53
f2211881 ZL	54	ret = asprintf(&file->path, "%s/data.%d", data->path, i);
f2211881 ZL	55	if (ret < 0)
14552063 JO	56	goto out_err;
	57
	58	ret = open(file->path, O_RDWR\|O_CREAT\|O_TRUNC, S_IRUSR\|S_IWUSR);
	59	if (ret < 0)
	60	goto out_err;
	61
	62	file->fd = ret;
	63	}
	64
	65	return 0;
	66
	67	out_err:
	68	close_dir(files, i);
	69	return ret;
	70	}
	71
eb617670 JO	72	int perf_data__open_dir(struct perf_data *data)
	73	{
	74	struct perf_data_file *files = NULL;
	75	struct dirent *dent;
	76	int ret = -1;
	77	DIR *dir;
	78	int nr = 0;
	79
46e201ef AH	80	/*
	81	* Directory containing a single regular perf data file which is already
	82	* open, means there is nothing more to do here.
	83	*/
	84	if (perf_data__is_single_file(data))
	85	return 0;
	86
ec65def1 JO	87	if (WARN_ON(!data->is_dir))
	88	return -EINVAL;
	89
258031c0 JO	90	/* The version is provided by DIR_FORMAT feature. */
	91	if (WARN_ON(data->dir.version != PERF_DIR_VERSION))
	92	return -1;
	93
eb617670 JO	94	dir = opendir(data->path);
	95	if (!dir)
	96	return -EINVAL;
	97
	98	while ((dent = readdir(dir)) != NULL) {
	99	struct perf_data_file *file;
	100	char path[PATH_MAX];
	101	struct stat st;
	102
	103	snprintf(path, sizeof(path), "%s/%s", data->path, dent->d_name);
	104	if (stat(path, &st))
	105	continue;
	106
490e6db0	107	if (!S_ISREG(st.st_mode) \|\| strncmp(dent->d_name, "data.", 5))
eb617670 JO	108	continue;
	109
	110	ret = -ENOMEM;
	111
	112	file = realloc(files, (nr + 1) * sizeof(*files));
	113	if (!file)
	114	goto out_err;
	115
	116	files = file;
	117	file = &files[nr++];
	118
	119	file->path = strdup(path);
	120	if (!file->path)
	121	goto out_err;
	122
	123	ret = open(file->path, O_RDONLY);
	124	if (ret < 0)
	125	goto out_err;
	126
	127	file->fd = ret;
	128	file->size = st.st_size;
	129	}
	130
	131	if (!files)
	132	return -EINVAL;
	133
	134	data->dir.files = files;
	135	data->dir.nr = nr;
	136	return 0;
	137
	138	out_err:
	139	close_dir(files, nr);
	140	return ret;
	141	}
	142
e8be1357 JO	143	int perf_data__update_dir(struct perf_data *data)
	144	{
	145	int i;
	146
	147	if (WARN_ON(!data->is_dir))
	148	return -EINVAL;
	149
	150	for (i = 0; i < data->dir.nr; i++) {
	151	struct perf_data_file *file = &data->dir.files[i];
	152	struct stat st;
	153
	154	if (fstat(file->fd, &st))
	155	return -1;
	156
	157	file->size = st.st_size;
	158	}
	159
	160	return 0;
	161	}
	162
8ceb41d7	163	static bool check_pipe(struct perf_data *data)
6a4d98d7 JO	164	{
	165	struct stat st;
	166	bool is_pipe = false;
8ceb41d7	167	int fd = perf_data__is_read(data) ?
6a4d98d7 JO	168	STDIN_FILENO : STDOUT_FILENO;
6a4d98d7 JO	169
2d4f2799	170	if (!data->path) {
6a4d98d7 JO	171	if (!fstat(fd, &st) && S_ISFIFO(st.st_mode))
	172	is_pipe = true;
	173	} else {
2d4f2799	174	if (!strcmp(data->path, "-"))
6a4d98d7 JO	175	is_pipe = true;
	176	}
	177
60136667 NK	178	if (is_pipe) {
	179	if (data->use_stdio) {
	180	const char *mode;
	181
	182	mode = perf_data__is_read(data) ? "r" : "w";
	183	data->file.fptr = fdopen(fd, mode);
	184
	185	if (data->file.fptr == NULL) {
	186	data->file.fd = fd;
	187	data->use_stdio = false;
	188	}
	189	} else {
	190	data->file.fd = fd;
	191	}
	192	}
6a4d98d7	193
8ceb41d7	194	return data->is_pipe = is_pipe;
6a4d98d7 JO	195	}
6a4d98d7 JO	196
8ceb41d7	197	static int check_backup(struct perf_data *data)
6a4d98d7 JO	198	{
	199	struct stat st;
	200
5021fc4e JO	201	if (perf_data__is_read(data))
	202	return 0;
	203
2d4f2799	204	if (!stat(data->path, &st) && st.st_size) {
6a4d98d7	205	char oldname[PATH_MAX];
ccb7a71d JO	206	int ret;
ccb7a71d JO	207
6a4d98d7	208	snprintf(oldname, sizeof(oldname), "%s.old",
2d4f2799	209	data->path);
ccb7a71d JO	210
	211	ret = rm_rf_perf_data(oldname);
	212	if (ret) {
	213	pr_err("Can't remove old data: %s (%s)\n",
	214	ret == -2 ?
	215	"Unknown file found" : strerror(errno),
	216	oldname);
	217	return -1;
	218	}
	219
	220	if (rename(data->path, oldname)) {
	221	pr_err("Can't move data: %s (%s to %s)\n",
	222	strerror(errno),
	223	data->path, oldname);
	224	return -1;
	225	}
6a4d98d7 JO	226	}
	227
	228	return 0;
	229	}
	230
ec65def1 JO	231	static bool is_dir(struct perf_data *data)
	232	{
	233	struct stat st;
	234
	235	if (stat(data->path, &st))
	236	return false;
	237
	238	return (st.st_mode & S_IFMT) == S_IFDIR;
	239	}
	240
8ceb41d7	241	static int open_file_read(struct perf_data *data)
6a4d98d7 JO	242	{
	243	struct stat st;
	244	int fd;
6e81c74c	245	char sbuf[STRERR_BUFSIZE];
6a4d98d7	246
eae8ad80	247	fd = open(data->file.path, O_RDONLY);
6a4d98d7 JO	248	if (fd < 0) {
	249	int err = errno;
	250
eae8ad80	251	pr_err("failed to open %s: %s", data->file.path,
c8b5f2c9	252	str_error_r(err, sbuf, sizeof(sbuf)));
eae8ad80	253	if (err == ENOENT && !strcmp(data->file.path, "perf.data"))
6a4d98d7 JO	254	pr_err(" (try 'perf record' first)");
	255	pr_err("\n");
	256	return -err;
	257	}
	258
	259	if (fstat(fd, &st) < 0)
	260	goto out_close;
	261
8ceb41d7	262	if (!data->force && st.st_uid && (st.st_uid != geteuid())) {
071266bf	263	pr_err("File %s not owned by current user or root (use -f to override)\n",
eae8ad80	264	data->file.path);
6a4d98d7 JO	265	goto out_close;
	266	}
	267
	268	if (!st.st_size) {
8ceb41d7	269	pr_info("zero-sized data (%s), nothing to do!\n",
eae8ad80	270	data->file.path);
6a4d98d7 JO	271	goto out_close;
	272	}
	273
45112e89	274	data->file.size = st.st_size;
6a4d98d7 JO	275	return fd;
	276
	277	out_close:
	278	close(fd);
	279	return -1;
	280	}
	281
8ceb41d7	282	static int open_file_write(struct perf_data *data)
6a4d98d7	283	{
ffa91880	284	int fd;
6e81c74c	285	char sbuf[STRERR_BUFSIZE];
ffa91880	286
eae8ad80	287	fd = open(data->file.path, O_CREAT\|O_RDWR\|O_TRUNC\|O_CLOEXEC,
cd6379eb	288	S_IRUSR\|S_IWUSR);
ffa91880 AB	289
ffa91880 AB	290	if (fd < 0)
eae8ad80	291	pr_err("failed to open %s : %s\n", data->file.path,
c8b5f2c9	292	str_error_r(errno, sbuf, sizeof(sbuf)));
ffa91880 AB	293
ffa91880 AB	294	return fd;
6a4d98d7 JO	295	}
6a4d98d7 JO	296
8ceb41d7	297	static int open_file(struct perf_data *data)
6a4d98d7 JO	298	{
	299	int fd;
	300
8ceb41d7 JO	301	fd = perf_data__is_read(data) ?
8ceb41d7 JO	302	open_file_read(data) : open_file_write(data);
6a4d98d7	303
2d4f2799	304	if (fd < 0) {
b8f7d86b	305	zfree(&data->file.path);
2d4f2799 JO	306	return -1;
	307	}
	308
eae8ad80	309	data->file.fd = fd;
2d4f2799 JO	310	return 0;
	311	}
	312
	313	static int open_file_dup(struct perf_data *data)
	314	{
	315	data->file.path = strdup(data->path);
	316	if (!data->file.path)
	317	return -ENOMEM;
	318
	319	return open_file(data);
6a4d98d7 JO	320	}
6a4d98d7 JO	321
ec65def1 JO	322	static int open_dir(struct perf_data *data)
	323	{
	324	int ret;
	325
	326	/*
	327	* So far we open only the header, so we can read the data version and
	328	* layout.
	329	*/
9b70b9db	330	if (asprintf(&data->file.path, "%s/data", data->path) < 0)
ec65def1 JO	331	return -1;
	332
	333	if (perf_data__is_write(data) &&
	334	mkdir(data->path, S_IRWXU) < 0)
	335	return -1;
	336
	337	ret = open_file(data);
	338
	339	/* Cleanup whatever we managed to create so far. */
	340	if (ret && perf_data__is_write(data))
	341	rm_rf_perf_data(data->path);
	342
	343	return ret;
	344	}
	345
8ceb41d7	346	int perf_data__open(struct perf_data *data)
6a4d98d7	347	{
8ceb41d7	348	if (check_pipe(data))
6a4d98d7 JO	349	return 0;
6a4d98d7 JO	350
60136667 NK	351	/* currently it allows stdio for pipe only */
	352	data->use_stdio = false;
	353
2d4f2799 JO	354	if (!data->path)
2d4f2799 JO	355	data->path = "perf.data";
6a4d98d7	356
5021fc4e JO	357	if (check_backup(data))
	358	return -1;
	359
ec65def1 JO	360	if (perf_data__is_read(data))
	361	data->is_dir = is_dir(data);
	362
	363	return perf_data__is_dir(data) ?
	364	open_dir(data) : open_file_dup(data);
6a4d98d7 JO	365	}
6a4d98d7 JO	366
8ceb41d7	367	void perf_data__close(struct perf_data *data)
6a4d98d7	368	{
ec65def1 JO	369	if (perf_data__is_dir(data))
	370	perf_data__close_dir(data);
	371
b8f7d86b	372	zfree(&data->file.path);
60136667 NK	373
	374	if (data->use_stdio)
	375	fclose(data->file.fptr);
	376	else
	377	close(data->file.fd);
	378	}
	379
	380	ssize_t perf_data__read(struct perf_data data, void buf, size_t size)
	381	{
	382	if (data->use_stdio) {
	383	if (fread(buf, size, 1, data->file.fptr) == 1)
	384	return size;
	385	return feof(data->file.fptr) ? 0 : -1;
	386	}
	387	return readn(data->file.fd, buf, size);
6a4d98d7	388	}
6f9a317f	389
e268687b JO	390	ssize_t perf_data_file__write(struct perf_data_file *file,
	391	void *buf, size_t size)
	392	{
	393	return writen(file->fd, buf, size);
	394	}
	395
8ceb41d7	396	ssize_t perf_data__write(struct perf_data *data,
6f9a317f JO	397	void *buf, size_t size)
6f9a317f JO	398	{
60136667 NK	399	if (data->use_stdio) {
	400	if (fwrite(buf, size, 1, data->file.fptr) == 1)
	401	return size;
	402	return -1;
	403	}
e268687b	404	return perf_data_file__write(&data->file, buf, size);
6f9a317f	405	}
040f9915	406
8ceb41d7	407	int perf_data__switch(struct perf_data *data,
040f9915	408	const char *postfix,
03724b2e AK	409	size_t pos, bool at_exit,
03724b2e AK	410	char **new_filepath)
040f9915	411	{
040f9915 WN	412	int ret;
040f9915 WN	413
8ceb41d7	414	if (check_pipe(data))
040f9915	415	return -EINVAL;
8ceb41d7	416	if (perf_data__is_read(data))
040f9915 WN	417	return -EINVAL;
040f9915 WN	418
03724b2e	419	if (asprintf(new_filepath, "%s.%s", data->path, postfix) < 0)
040f9915 WN	420	return -ENOMEM;
	421
	422	/*
	423	* Only fire a warning, don't return error, continue fill
	424	* original file.
	425	*/
03724b2e AK	426	if (rename(data->path, *new_filepath))
03724b2e AK	427	pr_warning("Failed to rename %s to %s\n", data->path, *new_filepath);
040f9915 WN	428
040f9915 WN	429	if (!at_exit) {
eae8ad80	430	close(data->file.fd);
8ceb41d7	431	ret = perf_data__open(data);
040f9915 WN	432	if (ret < 0)
	433	goto out;
	434
eae8ad80	435	if (lseek(data->file.fd, pos, SEEK_SET) == (off_t)-1) {
040f9915 WN	436	ret = -errno;
	437	pr_debug("Failed to lseek to %zu: %s",
	438	pos, strerror(errno));
	439	goto out;
	440	}
	441	}
eae8ad80	442	ret = data->file.fd;
040f9915	443	out:
040f9915 WN	444	return ret;
040f9915 WN	445	}
29583c17 JO	446
	447	unsigned long perf_data__size(struct perf_data *data)
	448	{
	449	u64 size = data->file.size;
	450	int i;
	451
46e201ef	452	if (perf_data__is_single_file(data))
29583c17 JO	453	return size;
	454
	455	for (i = 0; i < data->dir.nr; i++) {
	456	struct perf_data_file *file = &data->dir.files[i];
	457
	458	size += file->size;
	459	}
	460
	461	return size;
	462	}
eeb399b5 AH	463
	464	int perf_data__make_kcore_dir(struct perf_data data, char buf, size_t buf_sz)
	465	{
	466	int ret;
	467
	468	if (!data->is_dir)
	469	return -1;
	470
	471	ret = snprintf(buf, buf_sz, "%s/kcore_dir", data->path);
	472	if (ret < 0 \|\| (size_t)ret >= buf_sz)
	473	return -1;
	474
	475	return mkdir(buf, S_IRWXU);
	476	}
	477
	478	char perf_data__kallsyms_name(struct perf_data data)
	479	{
	480	char *kallsyms_name;
	481	struct stat st;
	482
	483	if (!data->is_dir)
	484	return NULL;
	485
	486	if (asprintf(&kallsyms_name, "%s/kcore_dir/kallsyms", data->path) < 0)
	487	return NULL;
	488
	489	if (stat(kallsyms_name, &st)) {
	490	free(kallsyms_name);
	491	return NULL;
	492	}
	493
	494	return kallsyms_name;
	495	}
058f1511 JO	496
	497	bool is_perf_data(const char *path)
	498	{
	499	bool ret = false;
	500	FILE *file;
	501	u64 magic;
	502
	503	file = fopen(path, "r");
	504	if (!file)
	505	return false;
	506
	507	if (fread(&magic, 1, 8, file) < 8)
	508	goto out;
	509
	510	ret = is_perf_magic(magic);
	511	out:
	512	fclose(file);
	513	return ret;
	514	}