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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 >= 0) {
 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         int flags = data->in_place_update ? O_RDWR : O_RDONLY;
244         struct stat st;
245         int fd;
246         char sbuf[STRERR_BUFSIZE];
247 
248         fd = open(data->file.path, flags);
249         if (fd < 0) {
250                 int err = errno;
251 
252                 pr_err("failed to open %s: %s", data->file.path,
253                         str_error_r(err, sbuf, sizeof(sbuf)));
254                 if (err == ENOENT && !strcmp(data->file.path, "perf.data"))
255                         pr_err("  (try 'perf record' first)");
256                 pr_err("\n");
257                 return -err;
258         }
259 
260         if (fstat(fd, &st) < 0)
261                 goto out_close;
262 
263         if (!data->force && st.st_uid && (st.st_uid != geteuid())) {
264                 pr_err("File %s not owned by current user or root (use -f to override)\n",
265                        data->file.path);
266                 goto out_close;
267         }
268 
269         if (!st.st_size) {
270                 pr_info("zero-sized data (%s), nothing to do!\n",
271                         data->file.path);
272                 goto out_close;
273         }
274 
275         data->file.size = st.st_size;
276         return fd;
277 
278  out_close:
279         close(fd);
280         return -1;
281 }
282 
283 static int open_file_write(struct perf_data *data)
284 {
285         int fd;
286         char sbuf[STRERR_BUFSIZE];
287 
288         fd = open(data->file.path, O_CREAT|O_RDWR|O_TRUNC|O_CLOEXEC,
289                   S_IRUSR|S_IWUSR);
290 
291         if (fd < 0)
292                 pr_err("failed to open %s : %s\n", data->file.path,
293                         str_error_r(errno, sbuf, sizeof(sbuf)));
294 
295         return fd;
296 }
297 
298 static int open_file(struct perf_data *data)
299 {
300         int fd;
301 
302         fd = perf_data__is_read(data) ?
303              open_file_read(data) : open_file_write(data);
304 
305         if (fd < 0) {
306                 zfree(&data->file.path);
307                 return -1;
308         }
309 
310         data->file.fd = fd;
311         return 0;
312 }
313 
314 static int open_file_dup(struct perf_data *data)
315 {
316         data->file.path = strdup(data->path);
317         if (!data->file.path)
318                 return -ENOMEM;
319 
320         return open_file(data);
321 }
322 
323 static int open_dir(struct perf_data *data)
324 {
325         int ret;
326 
327         /*
328          * So far we open only the header, so we can read the data version and
329          * layout.
330          */
331         if (asprintf(&data->file.path, "%s/data", data->path) < 0)
332                 return -1;
333 
334         if (perf_data__is_write(data) &&
335             mkdir(data->path, S_IRWXU) < 0)
336                 return -1;
337 
338         ret = open_file(data);
339 
340         /* Cleanup whatever we managed to create so far. */
341         if (ret && perf_data__is_write(data))
342                 rm_rf_perf_data(data->path);
343 
344         return ret;
345 }
346 
347 int perf_data__open(struct perf_data *data)
348 {
349         if (check_pipe(data))
350                 return 0;
351 
352         /* currently it allows stdio for pipe only */
353         data->use_stdio = false;
354 
355         if (!data->path)
356                 data->path = "perf.data";
357 
358         if (check_backup(data))
359                 return -1;
360 
361         if (perf_data__is_read(data))
362                 data->is_dir = is_dir(data);
363 
364         return perf_data__is_dir(data) ?
365                open_dir(data) : open_file_dup(data);
366 }
367 
368 void perf_data__close(struct perf_data *data)
369 {
370         if (perf_data__is_dir(data))
371                 perf_data__close_dir(data);
372 
373         zfree(&data->file.path);
374 
375         if (data->use_stdio)
376                 fclose(data->file.fptr);
377         else
378                 close(data->file.fd);
379 }
380 
381 ssize_t perf_data__read(struct perf_data *data, void *buf, size_t size)
382 {
383         if (data->use_stdio) {
384                 if (fread(buf, size, 1, data->file.fptr) == 1)
385                         return size;
386                 return feof(data->file.fptr) ? 0 : -1;
387         }
388         return readn(data->file.fd, buf, size);
389 }
390 
391 ssize_t perf_data_file__write(struct perf_data_file *file,
392                               void *buf, size_t size)
393 {
394         return writen(file->fd, buf, size);
395 }
396 
397 ssize_t perf_data__write(struct perf_data *data,
398                               void *buf, size_t size)
399 {
400         if (data->use_stdio) {
401                 if (fwrite(buf, size, 1, data->file.fptr) == 1)
402                         return size;
403                 return -1;
404         }
405         return perf_data_file__write(&data->file, buf, size);
406 }
407 
408 int perf_data__switch(struct perf_data *data,
409                            const char *postfix,
410                            size_t pos, bool at_exit,
411                            char **new_filepath)
412 {
413         int ret;
414 
415         if (check_pipe(data))
416                 return -EINVAL;
417         if (perf_data__is_read(data))
418                 return -EINVAL;
419 
420         if (asprintf(new_filepath, "%s.%s", data->path, postfix) < 0)
421                 return -ENOMEM;
422 
423         /*
424          * Only fire a warning, don't return error, continue fill
425          * original file.
426          */
427         if (rename(data->path, *new_filepath))
428                 pr_warning("Failed to rename %s to %s\n", data->path, *new_filepath);
429 
430         if (!at_exit) {
431                 close(data->file.fd);
432                 ret = perf_data__open(data);
433                 if (ret < 0)
434                         goto out;
435 
436                 if (lseek(data->file.fd, pos, SEEK_SET) == (off_t)-1) {
437                         ret = -errno;
438                         pr_debug("Failed to lseek to %zu: %s",
439                                  pos, strerror(errno));
440                         goto out;
441                 }
442         }
443         ret = data->file.fd;
444 out:
445         return ret;
446 }
447 
448 unsigned long perf_data__size(struct perf_data *data)
449 {
450         u64 size = data->file.size;
451         int i;
452 
453         if (perf_data__is_single_file(data))
454                 return size;
455 
456         for (i = 0; i < data->dir.nr; i++) {
457                 struct perf_data_file *file = &data->dir.files[i];
458 
459                 size += file->size;
460         }
461 
462         return size;
463 }
464 
465 int perf_data__make_kcore_dir(struct perf_data *data, char *buf, size_t buf_sz)
466 {
467         int ret;
468 
469         if (!data->is_dir)
470                 return -1;
471 
472         ret = snprintf(buf, buf_sz, "%s/kcore_dir", data->path);
473         if (ret < 0 || (size_t)ret >= buf_sz)
474                 return -1;
475 
476         return mkdir(buf, S_IRWXU);
477 }
478 
479 char *perf_data__kallsyms_name(struct perf_data *data)
480 {
481         char *kallsyms_name;
482         struct stat st;
483 
484         if (!data->is_dir)
485                 return NULL;
486 
487         if (asprintf(&kallsyms_name, "%s/kcore_dir/kallsyms", data->path) < 0)
488                 return NULL;
489 
490         if (stat(kallsyms_name, &st)) {
491                 free(kallsyms_name);
492                 return NULL;
493         }
494 
495         return kallsyms_name;
496 }
497 
498 bool is_perf_data(const char *path)
499 {
500         bool ret = false;
501         FILE *file;
502         u64 magic;
503 
504         file = fopen(path, "r");
505         if (!file)
506                 return false;
507 
508         if (fread(&magic, 1, 8, file) < 8)
509                 goto out;
510 
511         ret = is_perf_magic(magic);
512 out:
513         fclose(file);
514         return ret;
515 }
516 

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