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TOMOYO Linux Cross Reference
Linux/tools/perf/util/data.c

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  1 // SPDX-License-Identifier: GPL-2.0
  2 #include <linux/compiler.h>
  3 #include <linux/kernel.h>
  4 #include <linux/string.h>
  5 #include <linux/zalloc.h>
  6 #include <sys/types.h>
  7 #include <sys/stat.h>
  8 #include <errno.h>
  9 #include <fcntl.h>
 10 #include <unistd.h>
 11 #include <string.h>
 12 #include <asm/bug.h>
 13 #include <dirent.h>
 14 
 15 #include "data.h"
 16 #include "util.h" // rm_rf_perf_data()
 17 #include "debug.h"
 18 #include "header.h"
 19 #include <internal/lib.h>
 20 
 21 static void close_dir(struct perf_data_file *files, int nr)
 22 {
 23         while (--nr >= 1) {
 24                 close(files[nr].fd);
 25                 zfree(&files[nr].path);
 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;
 38         int i, ret;
 39 
 40         if (WARN_ON(!data->is_dir))
 41                 return -EINVAL;
 42 
 43         files = zalloc(nr * sizeof(*files));
 44         if (!files)
 45                 return -ENOMEM;
 46 
 47         data->dir.version = PERF_DIR_VERSION;
 48         data->dir.files   = files;
 49         data->dir.nr      = nr;
 50 
 51         for (i = 0; i < nr; i++) {
 52                 struct perf_data_file *file = &files[i];
 53 
 54                 ret = asprintf(&file->path, "%s/data.%d", data->path, i);
 55                 if (ret < 0)
 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 
 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 
 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 
 87         if (WARN_ON(!data->is_dir))
 88                 return -EINVAL;
 89 
 90         /* The version is provided by DIR_FORMAT feature. */
 91         if (WARN_ON(data->dir.version != PERF_DIR_VERSION))
 92                 return -1;
 93 
 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 
107                 if (!S_ISREG(st.st_mode) || strncmp(dent->d_name, "data.", 5))
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 
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 
163 static bool check_pipe(struct perf_data *data)
164 {
165         struct stat st;
166         bool is_pipe = false;
167         int fd = perf_data__is_read(data) ?
168                  STDIN_FILENO : STDOUT_FILENO;
169 
170         if (!data->path) {
171                 if (!fstat(fd, &st) && S_ISFIFO(st.st_mode))
172                         is_pipe = true;
173         } else {
174                 if (!strcmp(data->path, "-"))
175                         is_pipe = true;
176         }
177 
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         }
193 
194         return data->is_pipe = is_pipe;
195 }
196 
197 static int check_backup(struct perf_data *data)
198 {
199         struct stat st;
200 
201         if (perf_data__is_read(data))
202                 return 0;
203 
204         if (!stat(data->path, &st) && st.st_size) {
205                 char oldname[PATH_MAX];
206                 int ret;
207 
208                 snprintf(oldname, sizeof(oldname), "%s.old",
209                          data->path);
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                 }
226         }
227 
228         return 0;
229 }
230 
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 
241 static int open_file_read(struct perf_data *data)
242 {
243         struct stat st;
244         int fd;
245         char sbuf[STRERR_BUFSIZE];
246 
247         fd = open(data->file.path, O_RDONLY);
248         if (fd < 0) {
249                 int err = errno;
250 
251                 pr_err("failed to open %s: %s", data->file.path,
252                         str_error_r(err, sbuf, sizeof(sbuf)));
253                 if (err == ENOENT && !strcmp(data->file.path, "perf.data"))
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 
262         if (!data->force && st.st_uid && (st.st_uid != geteuid())) {
263                 pr_err("File %s not owned by current user or root (use -f to override)\n",
264                        data->file.path);
265                 goto out_close;
266         }
267 
268         if (!st.st_size) {
269                 pr_info("zero-sized data (%s), nothing to do!\n",
270                         data->file.path);
271                 goto out_close;
272         }
273 
274         data->file.size = st.st_size;
275         return fd;
276 
277  out_close:
278         close(fd);
279         return -1;
280 }
281 
282 static int open_file_write(struct perf_data *data)
283 {
284         int fd;
285         char sbuf[STRERR_BUFSIZE];
286 
287         fd = open(data->file.path, O_CREAT|O_RDWR|O_TRUNC|O_CLOEXEC,
288                   S_IRUSR|S_IWUSR);
289 
290         if (fd < 0)
291                 pr_err("failed to open %s : %s\n", data->file.path,
292                         str_error_r(errno, sbuf, sizeof(sbuf)));
293 
294         return fd;
295 }
296 
297 static int open_file(struct perf_data *data)
298 {
299         int fd;
300 
301         fd = perf_data__is_read(data) ?
302              open_file_read(data) : open_file_write(data);
303 
304         if (fd < 0) {
305                 zfree(&data->file.path);
306                 return -1;
307         }
308 
309         data->file.fd = fd;
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);
320 }
321 
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          */
330         if (asprintf(&data->file.path, "%s/data", data->path) < 0)
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 
346 int perf_data__open(struct perf_data *data)
347 {
348         if (check_pipe(data))
349                 return 0;
350 
351         /* currently it allows stdio for pipe only */
352         data->use_stdio = false;
353 
354         if (!data->path)
355                 data->path = "perf.data";
356 
357         if (check_backup(data))
358                 return -1;
359 
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);
365 }
366 
367 void perf_data__close(struct perf_data *data)
368 {
369         if (perf_data__is_dir(data))
370                 perf_data__close_dir(data);
371 
372         zfree(&data->file.path);
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);
388 }
389 
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 
396 ssize_t perf_data__write(struct perf_data *data,
397                               void *buf, size_t size)
398 {
399         if (data->use_stdio) {
400                 if (fwrite(buf, size, 1, data->file.fptr) == 1)
401                         return size;
402                 return -1;
403         }
404         return perf_data_file__write(&data->file, buf, size);
405 }
406 
407 int perf_data__switch(struct perf_data *data,
408                            const char *postfix,
409                            size_t pos, bool at_exit,
410                            char **new_filepath)
411 {
412         int ret;
413 
414         if (check_pipe(data))
415                 return -EINVAL;
416         if (perf_data__is_read(data))
417                 return -EINVAL;
418 
419         if (asprintf(new_filepath, "%s.%s", data->path, postfix) < 0)
420                 return -ENOMEM;
421 
422         /*
423          * Only fire a warning, don't return error, continue fill
424          * original file.
425          */
426         if (rename(data->path, *new_filepath))
427                 pr_warning("Failed to rename %s to %s\n", data->path, *new_filepath);
428 
429         if (!at_exit) {
430                 close(data->file.fd);
431                 ret = perf_data__open(data);
432                 if (ret < 0)
433                         goto out;
434 
435                 if (lseek(data->file.fd, pos, SEEK_SET) == (off_t)-1) {
436                         ret = -errno;
437                         pr_debug("Failed to lseek to %zu: %s",
438                                  pos, strerror(errno));
439                         goto out;
440                 }
441         }
442         ret = data->file.fd;
443 out:
444         return ret;
445 }
446 
447 unsigned long perf_data__size(struct perf_data *data)
448 {
449         u64 size = data->file.size;
450         int i;
451 
452         if (perf_data__is_single_file(data))
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 }
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 }
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 }
515 

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