summaryrefslogtreecommitdiff
path: root/tools/perf/util/data.c
blob: 1d1b97a92c3f72a38bd98e405cb450a1f5dbb357 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
// SPDX-License-Identifier: GPL-2.0
#include <linux/compiler.h>
#include <linux/kernel.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 <sys/types.h>
#include <dirent.h>

#include "data.h"
#include "util.h"
#include "debug.h"
#include "header.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;
}