Commit | Line | Data |
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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
6a4d98d7 JO |
2 | #include <linux/compiler.h> |
3 | #include <linux/kernel.h> | |
8520a98d | 4 | #include <linux/string.h> |
7f7c536f | 5 | #include <linux/zalloc.h> |
6a4d98d7 JO |
6 | #include <sys/types.h> |
7 | #include <sys/stat.h> | |
a43783ae | 8 | #include <errno.h> |
c23c2a0f | 9 | #include <fcntl.h> |
6a4d98d7 JO |
10 | #include <unistd.h> |
11 | #include <string.h> | |
14552063 | 12 | #include <asm/bug.h> |
eb617670 | 13 | #include <dirent.h> |
6a4d98d7 JO |
14 | |
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; | |
38 | int i, ret = -1; | |
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 | ||
54 | if (asprintf(&file->path, "%s/data.%d", data->path, i) < 0) | |
55 | goto out_err; | |
56 | ||
57 | ret = open(file->path, O_RDWR|O_CREAT|O_TRUNC, S_IRUSR|S_IWUSR); | |
58 | if (ret < 0) | |
59 | goto out_err; | |
60 | ||
61 | file->fd = ret; | |
62 | } | |
63 | ||
64 | return 0; | |
65 | ||
66 | out_err: | |
67 | close_dir(files, i); | |
68 | return ret; | |
69 | } | |
70 | ||
eb617670 JO |
71 | int perf_data__open_dir(struct perf_data *data) |
72 | { | |
73 | struct perf_data_file *files = NULL; | |
74 | struct dirent *dent; | |
75 | int ret = -1; | |
76 | DIR *dir; | |
77 | int nr = 0; | |
78 | ||
ec65def1 JO |
79 | if (WARN_ON(!data->is_dir)) |
80 | return -EINVAL; | |
81 | ||
258031c0 JO |
82 | /* The version is provided by DIR_FORMAT feature. */ |
83 | if (WARN_ON(data->dir.version != PERF_DIR_VERSION)) | |
84 | return -1; | |
85 | ||
eb617670 JO |
86 | dir = opendir(data->path); |
87 | if (!dir) | |
88 | return -EINVAL; | |
89 | ||
90 | while ((dent = readdir(dir)) != NULL) { | |
91 | struct perf_data_file *file; | |
92 | char path[PATH_MAX]; | |
93 | struct stat st; | |
94 | ||
95 | snprintf(path, sizeof(path), "%s/%s", data->path, dent->d_name); | |
96 | if (stat(path, &st)) | |
97 | continue; | |
98 | ||
490e6db0 | 99 | if (!S_ISREG(st.st_mode) || strncmp(dent->d_name, "data.", 5)) |
eb617670 JO |
100 | continue; |
101 | ||
102 | ret = -ENOMEM; | |
103 | ||
104 | file = realloc(files, (nr + 1) * sizeof(*files)); | |
105 | if (!file) | |
106 | goto out_err; | |
107 | ||
108 | files = file; | |
109 | file = &files[nr++]; | |
110 | ||
111 | file->path = strdup(path); | |
112 | if (!file->path) | |
113 | goto out_err; | |
114 | ||
115 | ret = open(file->path, O_RDONLY); | |
116 | if (ret < 0) | |
117 | goto out_err; | |
118 | ||
119 | file->fd = ret; | |
120 | file->size = st.st_size; | |
121 | } | |
122 | ||
123 | if (!files) | |
124 | return -EINVAL; | |
125 | ||
126 | data->dir.files = files; | |
127 | data->dir.nr = nr; | |
128 | return 0; | |
129 | ||
130 | out_err: | |
131 | close_dir(files, nr); | |
132 | return ret; | |
133 | } | |
134 | ||
e8be1357 JO |
135 | int perf_data__update_dir(struct perf_data *data) |
136 | { | |
137 | int i; | |
138 | ||
139 | if (WARN_ON(!data->is_dir)) | |
140 | return -EINVAL; | |
141 | ||
142 | for (i = 0; i < data->dir.nr; i++) { | |
143 | struct perf_data_file *file = &data->dir.files[i]; | |
144 | struct stat st; | |
145 | ||
146 | if (fstat(file->fd, &st)) | |
147 | return -1; | |
148 | ||
149 | file->size = st.st_size; | |
150 | } | |
151 | ||
152 | return 0; | |
153 | } | |
154 | ||
8ceb41d7 | 155 | static bool check_pipe(struct perf_data *data) |
6a4d98d7 JO |
156 | { |
157 | struct stat st; | |
158 | bool is_pipe = false; | |
8ceb41d7 | 159 | int fd = perf_data__is_read(data) ? |
6a4d98d7 JO |
160 | STDIN_FILENO : STDOUT_FILENO; |
161 | ||
2d4f2799 | 162 | if (!data->path) { |
6a4d98d7 JO |
163 | if (!fstat(fd, &st) && S_ISFIFO(st.st_mode)) |
164 | is_pipe = true; | |
165 | } else { | |
2d4f2799 | 166 | if (!strcmp(data->path, "-")) |
6a4d98d7 JO |
167 | is_pipe = true; |
168 | } | |
169 | ||
170 | if (is_pipe) | |
eae8ad80 | 171 | data->file.fd = fd; |
6a4d98d7 | 172 | |
8ceb41d7 | 173 | return data->is_pipe = is_pipe; |
6a4d98d7 JO |
174 | } |
175 | ||
8ceb41d7 | 176 | static int check_backup(struct perf_data *data) |
6a4d98d7 JO |
177 | { |
178 | struct stat st; | |
179 | ||
5021fc4e JO |
180 | if (perf_data__is_read(data)) |
181 | return 0; | |
182 | ||
2d4f2799 | 183 | if (!stat(data->path, &st) && st.st_size) { |
6a4d98d7 | 184 | char oldname[PATH_MAX]; |
ccb7a71d JO |
185 | int ret; |
186 | ||
6a4d98d7 | 187 | snprintf(oldname, sizeof(oldname), "%s.old", |
2d4f2799 | 188 | data->path); |
ccb7a71d JO |
189 | |
190 | ret = rm_rf_perf_data(oldname); | |
191 | if (ret) { | |
192 | pr_err("Can't remove old data: %s (%s)\n", | |
193 | ret == -2 ? | |
194 | "Unknown file found" : strerror(errno), | |
195 | oldname); | |
196 | return -1; | |
197 | } | |
198 | ||
199 | if (rename(data->path, oldname)) { | |
200 | pr_err("Can't move data: %s (%s to %s)\n", | |
201 | strerror(errno), | |
202 | data->path, oldname); | |
203 | return -1; | |
204 | } | |
6a4d98d7 JO |
205 | } |
206 | ||
207 | return 0; | |
208 | } | |
209 | ||
ec65def1 JO |
210 | static bool is_dir(struct perf_data *data) |
211 | { | |
212 | struct stat st; | |
213 | ||
214 | if (stat(data->path, &st)) | |
215 | return false; | |
216 | ||
217 | return (st.st_mode & S_IFMT) == S_IFDIR; | |
218 | } | |
219 | ||
8ceb41d7 | 220 | static int open_file_read(struct perf_data *data) |
6a4d98d7 JO |
221 | { |
222 | struct stat st; | |
223 | int fd; | |
6e81c74c | 224 | char sbuf[STRERR_BUFSIZE]; |
6a4d98d7 | 225 | |
eae8ad80 | 226 | fd = open(data->file.path, O_RDONLY); |
6a4d98d7 JO |
227 | if (fd < 0) { |
228 | int err = errno; | |
229 | ||
eae8ad80 | 230 | pr_err("failed to open %s: %s", data->file.path, |
c8b5f2c9 | 231 | str_error_r(err, sbuf, sizeof(sbuf))); |
eae8ad80 | 232 | if (err == ENOENT && !strcmp(data->file.path, "perf.data")) |
6a4d98d7 JO |
233 | pr_err(" (try 'perf record' first)"); |
234 | pr_err("\n"); | |
235 | return -err; | |
236 | } | |
237 | ||
238 | if (fstat(fd, &st) < 0) | |
239 | goto out_close; | |
240 | ||
8ceb41d7 | 241 | if (!data->force && st.st_uid && (st.st_uid != geteuid())) { |
071266bf | 242 | pr_err("File %s not owned by current user or root (use -f to override)\n", |
eae8ad80 | 243 | data->file.path); |
6a4d98d7 JO |
244 | goto out_close; |
245 | } | |
246 | ||
247 | if (!st.st_size) { | |
8ceb41d7 | 248 | pr_info("zero-sized data (%s), nothing to do!\n", |
eae8ad80 | 249 | data->file.path); |
6a4d98d7 JO |
250 | goto out_close; |
251 | } | |
252 | ||
45112e89 | 253 | data->file.size = st.st_size; |
6a4d98d7 JO |
254 | return fd; |
255 | ||
256 | out_close: | |
257 | close(fd); | |
258 | return -1; | |
259 | } | |
260 | ||
8ceb41d7 | 261 | static int open_file_write(struct perf_data *data) |
6a4d98d7 | 262 | { |
ffa91880 | 263 | int fd; |
6e81c74c | 264 | char sbuf[STRERR_BUFSIZE]; |
ffa91880 | 265 | |
eae8ad80 | 266 | fd = open(data->file.path, O_CREAT|O_RDWR|O_TRUNC|O_CLOEXEC, |
cd6379eb | 267 | S_IRUSR|S_IWUSR); |
ffa91880 AB |
268 | |
269 | if (fd < 0) | |
eae8ad80 | 270 | pr_err("failed to open %s : %s\n", data->file.path, |
c8b5f2c9 | 271 | str_error_r(errno, sbuf, sizeof(sbuf))); |
ffa91880 AB |
272 | |
273 | return fd; | |
6a4d98d7 JO |
274 | } |
275 | ||
8ceb41d7 | 276 | static int open_file(struct perf_data *data) |
6a4d98d7 JO |
277 | { |
278 | int fd; | |
279 | ||
8ceb41d7 JO |
280 | fd = perf_data__is_read(data) ? |
281 | open_file_read(data) : open_file_write(data); | |
6a4d98d7 | 282 | |
2d4f2799 | 283 | if (fd < 0) { |
b8f7d86b | 284 | zfree(&data->file.path); |
2d4f2799 JO |
285 | return -1; |
286 | } | |
287 | ||
eae8ad80 | 288 | data->file.fd = fd; |
2d4f2799 JO |
289 | return 0; |
290 | } | |
291 | ||
292 | static int open_file_dup(struct perf_data *data) | |
293 | { | |
294 | data->file.path = strdup(data->path); | |
295 | if (!data->file.path) | |
296 | return -ENOMEM; | |
297 | ||
298 | return open_file(data); | |
6a4d98d7 JO |
299 | } |
300 | ||
ec65def1 JO |
301 | static int open_dir(struct perf_data *data) |
302 | { | |
303 | int ret; | |
304 | ||
305 | /* | |
306 | * So far we open only the header, so we can read the data version and | |
307 | * layout. | |
308 | */ | |
9b70b9db | 309 | if (asprintf(&data->file.path, "%s/data", data->path) < 0) |
ec65def1 JO |
310 | return -1; |
311 | ||
312 | if (perf_data__is_write(data) && | |
313 | mkdir(data->path, S_IRWXU) < 0) | |
314 | return -1; | |
315 | ||
316 | ret = open_file(data); | |
317 | ||
318 | /* Cleanup whatever we managed to create so far. */ | |
319 | if (ret && perf_data__is_write(data)) | |
320 | rm_rf_perf_data(data->path); | |
321 | ||
322 | return ret; | |
323 | } | |
324 | ||
8ceb41d7 | 325 | int perf_data__open(struct perf_data *data) |
6a4d98d7 | 326 | { |
8ceb41d7 | 327 | if (check_pipe(data)) |
6a4d98d7 JO |
328 | return 0; |
329 | ||
2d4f2799 JO |
330 | if (!data->path) |
331 | data->path = "perf.data"; | |
6a4d98d7 | 332 | |
5021fc4e JO |
333 | if (check_backup(data)) |
334 | return -1; | |
335 | ||
ec65def1 JO |
336 | if (perf_data__is_read(data)) |
337 | data->is_dir = is_dir(data); | |
338 | ||
339 | return perf_data__is_dir(data) ? | |
340 | open_dir(data) : open_file_dup(data); | |
6a4d98d7 JO |
341 | } |
342 | ||
8ceb41d7 | 343 | void perf_data__close(struct perf_data *data) |
6a4d98d7 | 344 | { |
ec65def1 JO |
345 | if (perf_data__is_dir(data)) |
346 | perf_data__close_dir(data); | |
347 | ||
b8f7d86b | 348 | zfree(&data->file.path); |
eae8ad80 | 349 | close(data->file.fd); |
6a4d98d7 | 350 | } |
6f9a317f | 351 | |
e268687b JO |
352 | ssize_t perf_data_file__write(struct perf_data_file *file, |
353 | void *buf, size_t size) | |
354 | { | |
355 | return writen(file->fd, buf, size); | |
356 | } | |
357 | ||
8ceb41d7 | 358 | ssize_t perf_data__write(struct perf_data *data, |
6f9a317f JO |
359 | void *buf, size_t size) |
360 | { | |
e268687b | 361 | return perf_data_file__write(&data->file, buf, size); |
6f9a317f | 362 | } |
040f9915 | 363 | |
8ceb41d7 | 364 | int perf_data__switch(struct perf_data *data, |
040f9915 | 365 | const char *postfix, |
03724b2e AK |
366 | size_t pos, bool at_exit, |
367 | char **new_filepath) | |
040f9915 | 368 | { |
040f9915 WN |
369 | int ret; |
370 | ||
8ceb41d7 | 371 | if (check_pipe(data)) |
040f9915 | 372 | return -EINVAL; |
8ceb41d7 | 373 | if (perf_data__is_read(data)) |
040f9915 WN |
374 | return -EINVAL; |
375 | ||
03724b2e | 376 | if (asprintf(new_filepath, "%s.%s", data->path, postfix) < 0) |
040f9915 WN |
377 | return -ENOMEM; |
378 | ||
379 | /* | |
380 | * Only fire a warning, don't return error, continue fill | |
381 | * original file. | |
382 | */ | |
03724b2e AK |
383 | if (rename(data->path, *new_filepath)) |
384 | pr_warning("Failed to rename %s to %s\n", data->path, *new_filepath); | |
040f9915 WN |
385 | |
386 | if (!at_exit) { | |
eae8ad80 | 387 | close(data->file.fd); |
8ceb41d7 | 388 | ret = perf_data__open(data); |
040f9915 WN |
389 | if (ret < 0) |
390 | goto out; | |
391 | ||
eae8ad80 | 392 | if (lseek(data->file.fd, pos, SEEK_SET) == (off_t)-1) { |
040f9915 WN |
393 | ret = -errno; |
394 | pr_debug("Failed to lseek to %zu: %s", | |
395 | pos, strerror(errno)); | |
396 | goto out; | |
397 | } | |
398 | } | |
eae8ad80 | 399 | ret = data->file.fd; |
040f9915 | 400 | out: |
040f9915 WN |
401 | return ret; |
402 | } | |
29583c17 JO |
403 | |
404 | unsigned long perf_data__size(struct perf_data *data) | |
405 | { | |
406 | u64 size = data->file.size; | |
407 | int i; | |
408 | ||
409 | if (!data->is_dir) | |
410 | return size; | |
411 | ||
412 | for (i = 0; i < data->dir.nr; i++) { | |
413 | struct perf_data_file *file = &data->dir.files[i]; | |
414 | ||
415 | size += file->size; | |
416 | } | |
417 | ||
418 | return size; | |
419 | } |