1
2#include <linux/compiler.h>
3#include <linux/kernel.h>
4#include <sys/types.h>
5#include <sys/stat.h>
6#include <errno.h>
7#include <fcntl.h>
8#include <unistd.h>
9#include <string.h>
10#include <asm/bug.h>
11#include <sys/types.h>
12#include <dirent.h>
13
14#include "data.h"
15#include "util.h"
16#include "debug.h"
17#include "header.h"
18
19static void close_dir(struct perf_data_file *files, int nr)
20{
21 while (--nr >= 1) {
22 close(files[nr].fd);
23 free(files[nr].path);
24 }
25 free(files);
26}
27
28void perf_data__close_dir(struct perf_data *data)
29{
30 close_dir(data->dir.files, data->dir.nr);
31}
32
33int perf_data__create_dir(struct perf_data *data, int nr)
34{
35 struct perf_data_file *files = NULL;
36 int i, ret = -1;
37
38 if (WARN_ON(!data->is_dir))
39 return -EINVAL;
40
41 files = zalloc(nr * sizeof(*files));
42 if (!files)
43 return -ENOMEM;
44
45 data->dir.version = PERF_DIR_VERSION;
46 data->dir.files = files;
47 data->dir.nr = nr;
48
49 for (i = 0; i < nr; i++) {
50 struct perf_data_file *file = &files[i];
51
52 if (asprintf(&file->path, "%s/data.%d", data->path, i) < 0)
53 goto out_err;
54
55 ret = open(file->path, O_RDWR|O_CREAT|O_TRUNC, S_IRUSR|S_IWUSR);
56 if (ret < 0)
57 goto out_err;
58
59 file->fd = ret;
60 }
61
62 return 0;
63
64out_err:
65 close_dir(files, i);
66 return ret;
67}
68
69int perf_data__open_dir(struct perf_data *data)
70{
71 struct perf_data_file *files = NULL;
72 struct dirent *dent;
73 int ret = -1;
74 DIR *dir;
75 int nr = 0;
76
77 if (WARN_ON(!data->is_dir))
78 return -EINVAL;
79
80
81 if (WARN_ON(data->dir.version != PERF_DIR_VERSION))
82 return -1;
83
84 dir = opendir(data->path);
85 if (!dir)
86 return -EINVAL;
87
88 while ((dent = readdir(dir)) != NULL) {
89 struct perf_data_file *file;
90 char path[PATH_MAX];
91 struct stat st;
92
93 snprintf(path, sizeof(path), "%s/%s", data->path, dent->d_name);
94 if (stat(path, &st))
95 continue;
96
97 if (!S_ISREG(st.st_mode) || strncmp(dent->d_name, "data", 4))
98 continue;
99
100 ret = -ENOMEM;
101
102 file = realloc(files, (nr + 1) * sizeof(*files));
103 if (!file)
104 goto out_err;
105
106 files = file;
107 file = &files[nr++];
108
109 file->path = strdup(path);
110 if (!file->path)
111 goto out_err;
112
113 ret = open(file->path, O_RDONLY);
114 if (ret < 0)
115 goto out_err;
116
117 file->fd = ret;
118 file->size = st.st_size;
119 }
120
121 if (!files)
122 return -EINVAL;
123
124 data->dir.files = files;
125 data->dir.nr = nr;
126 return 0;
127
128out_err:
129 close_dir(files, nr);
130 return ret;
131}
132
133int perf_data__update_dir(struct perf_data *data)
134{
135 int i;
136
137 if (WARN_ON(!data->is_dir))
138 return -EINVAL;
139
140 for (i = 0; i < data->dir.nr; i++) {
141 struct perf_data_file *file = &data->dir.files[i];
142 struct stat st;
143
144 if (fstat(file->fd, &st))
145 return -1;
146
147 file->size = st.st_size;
148 }
149
150 return 0;
151}
152
153static bool check_pipe(struct perf_data *data)
154{
155 struct stat st;
156 bool is_pipe = false;
157 int fd = perf_data__is_read(data) ?
158 STDIN_FILENO : STDOUT_FILENO;
159
160 if (!data->path) {
161 if (!fstat(fd, &st) && S_ISFIFO(st.st_mode))
162 is_pipe = true;
163 } else {
164 if (!strcmp(data->path, "-"))
165 is_pipe = true;
166 }
167
168 if (is_pipe)
169 data->file.fd = fd;
170
171 return data->is_pipe = is_pipe;
172}
173
174static int check_backup(struct perf_data *data)
175{
176 struct stat st;
177
178 if (perf_data__is_read(data))
179 return 0;
180
181 if (!stat(data->path, &st) && st.st_size) {
182 char oldname[PATH_MAX];
183 int ret;
184
185 snprintf(oldname, sizeof(oldname), "%s.old",
186 data->path);
187
188 ret = rm_rf_perf_data(oldname);
189 if (ret) {
190 pr_err("Can't remove old data: %s (%s)\n",
191 ret == -2 ?
192 "Unknown file found" : strerror(errno),
193 oldname);
194 return -1;
195 }
196
197 if (rename(data->path, oldname)) {
198 pr_err("Can't move data: %s (%s to %s)\n",
199 strerror(errno),
200 data->path, oldname);
201 return -1;
202 }
203 }
204
205 return 0;
206}
207
208static bool is_dir(struct perf_data *data)
209{
210 struct stat st;
211
212 if (stat(data->path, &st))
213 return false;
214
215 return (st.st_mode & S_IFMT) == S_IFDIR;
216}
217
218static int open_file_read(struct perf_data *data)
219{
220 struct stat st;
221 int fd;
222 char sbuf[STRERR_BUFSIZE];
223
224 fd = open(data->file.path, O_RDONLY);
225 if (fd < 0) {
226 int err = errno;
227
228 pr_err("failed to open %s: %s", data->file.path,
229 str_error_r(err, sbuf, sizeof(sbuf)));
230 if (err == ENOENT && !strcmp(data->file.path, "perf.data"))
231 pr_err(" (try 'perf record' first)");
232 pr_err("\n");
233 return -err;
234 }
235
236 if (fstat(fd, &st) < 0)
237 goto out_close;
238
239 if (!data->force && st.st_uid && (st.st_uid != geteuid())) {
240 pr_err("File %s not owned by current user or root (use -f to override)\n",
241 data->file.path);
242 goto out_close;
243 }
244
245 if (!st.st_size) {
246 pr_info("zero-sized data (%s), nothing to do!\n",
247 data->file.path);
248 goto out_close;
249 }
250
251 data->file.size = st.st_size;
252 return fd;
253
254 out_close:
255 close(fd);
256 return -1;
257}
258
259static int open_file_write(struct perf_data *data)
260{
261 int fd;
262 char sbuf[STRERR_BUFSIZE];
263
264 fd = open(data->file.path, O_CREAT|O_RDWR|O_TRUNC|O_CLOEXEC,
265 S_IRUSR|S_IWUSR);
266
267 if (fd < 0)
268 pr_err("failed to open %s : %s\n", data->file.path,
269 str_error_r(errno, sbuf, sizeof(sbuf)));
270
271 return fd;
272}
273
274static int open_file(struct perf_data *data)
275{
276 int fd;
277
278 fd = perf_data__is_read(data) ?
279 open_file_read(data) : open_file_write(data);
280
281 if (fd < 0) {
282 zfree(&data->file.path);
283 return -1;
284 }
285
286 data->file.fd = fd;
287 return 0;
288}
289
290static int open_file_dup(struct perf_data *data)
291{
292 data->file.path = strdup(data->path);
293 if (!data->file.path)
294 return -ENOMEM;
295
296 return open_file(data);
297}
298
299static int open_dir(struct perf_data *data)
300{
301 int ret;
302
303
304
305
306
307 if (asprintf(&data->file.path, "%s/header", data->path) < 0)
308 return -1;
309
310 if (perf_data__is_write(data) &&
311 mkdir(data->path, S_IRWXU) < 0)
312 return -1;
313
314 ret = open_file(data);
315
316
317 if (ret && perf_data__is_write(data))
318 rm_rf_perf_data(data->path);
319
320 return ret;
321}
322
323int perf_data__open(struct perf_data *data)
324{
325 if (check_pipe(data))
326 return 0;
327
328 if (!data->path)
329 data->path = "perf.data";
330
331 if (check_backup(data))
332 return -1;
333
334 if (perf_data__is_read(data))
335 data->is_dir = is_dir(data);
336
337 return perf_data__is_dir(data) ?
338 open_dir(data) : open_file_dup(data);
339}
340
341void perf_data__close(struct perf_data *data)
342{
343 if (perf_data__is_dir(data))
344 perf_data__close_dir(data);
345
346 zfree(&data->file.path);
347 close(data->file.fd);
348}
349
350ssize_t perf_data_file__write(struct perf_data_file *file,
351 void *buf, size_t size)
352{
353 return writen(file->fd, buf, size);
354}
355
356ssize_t perf_data__write(struct perf_data *data,
357 void *buf, size_t size)
358{
359 return perf_data_file__write(&data->file, buf, size);
360}
361
362int perf_data__switch(struct perf_data *data,
363 const char *postfix,
364 size_t pos, bool at_exit,
365 char **new_filepath)
366{
367 int ret;
368
369 if (check_pipe(data))
370 return -EINVAL;
371 if (perf_data__is_read(data))
372 return -EINVAL;
373
374 if (asprintf(new_filepath, "%s.%s", data->path, postfix) < 0)
375 return -ENOMEM;
376
377
378
379
380
381 if (rename(data->path, *new_filepath))
382 pr_warning("Failed to rename %s to %s\n", data->path, *new_filepath);
383
384 if (!at_exit) {
385 close(data->file.fd);
386 ret = perf_data__open(data);
387 if (ret < 0)
388 goto out;
389
390 if (lseek(data->file.fd, pos, SEEK_SET) == (off_t)-1) {
391 ret = -errno;
392 pr_debug("Failed to lseek to %zu: %s",
393 pos, strerror(errno));
394 goto out;
395 }
396 }
397 ret = data->file.fd;
398out:
399 return ret;
400}
401
402unsigned long perf_data__size(struct perf_data *data)
403{
404 u64 size = data->file.size;
405 int i;
406
407 if (!data->is_dir)
408 return size;
409
410 for (i = 0; i < data->dir.nr; i++) {
411 struct perf_data_file *file = &data->dir.files[i];
412
413 size += file->size;
414 }
415
416 return size;
417}
418
