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>
16 #include "util.h" // rm_rf_perf_data()
19 #include <internal/lib.h>
21 static void close_dir(struct perf_data_file *files, int nr)
25 zfree(&files[nr].path);
30 void perf_data__close_dir(struct perf_data *data)
32 close_dir(data->dir.files, data->dir.nr);
35 int perf_data__create_dir(struct perf_data *data, int nr)
37 struct perf_data_file *files = NULL;
40 if (WARN_ON(!data->is_dir))
43 files = zalloc(nr * sizeof(*files));
47 data->dir.version = PERF_DIR_VERSION;
48 data->dir.files = files;
51 for (i = 0; i < nr; i++) {
52 struct perf_data_file *file = &files[i];
54 if (asprintf(&file->path, "%s/data.%d", data->path, i) < 0)
57 ret = open(file->path, O_RDWR|O_CREAT|O_TRUNC, S_IRUSR|S_IWUSR);
71 int perf_data__open_dir(struct perf_data *data)
73 struct perf_data_file *files = NULL;
80 * Directory containing a single regular perf data file which is already
81 * open, means there is nothing more to do here.
83 if (perf_data__is_single_file(data))
86 if (WARN_ON(!data->is_dir))
89 /* The version is provided by DIR_FORMAT feature. */
90 if (WARN_ON(data->dir.version != PERF_DIR_VERSION))
93 dir = opendir(data->path);
97 while ((dent = readdir(dir)) != NULL) {
98 struct perf_data_file *file;
102 snprintf(path, sizeof(path), "%s/%s", data->path, dent->d_name);
106 if (!S_ISREG(st.st_mode) || strncmp(dent->d_name, "data.", 5))
111 file = realloc(files, (nr + 1) * sizeof(*files));
118 file->path = strdup(path);
122 ret = open(file->path, O_RDONLY);
127 file->size = st.st_size;
133 data->dir.files = files;
138 close_dir(files, nr);
142 int perf_data__update_dir(struct perf_data *data)
146 if (WARN_ON(!data->is_dir))
149 for (i = 0; i < data->dir.nr; i++) {
150 struct perf_data_file *file = &data->dir.files[i];
153 if (fstat(file->fd, &st))
156 file->size = st.st_size;
162 static bool check_pipe(struct perf_data *data)
165 bool is_pipe = false;
166 int fd = perf_data__is_read(data) ?
167 STDIN_FILENO : STDOUT_FILENO;
170 if (!fstat(fd, &st) && S_ISFIFO(st.st_mode))
173 if (!strcmp(data->path, "-"))
180 return data->is_pipe = is_pipe;
183 static int check_backup(struct perf_data *data)
187 if (perf_data__is_read(data))
190 if (!stat(data->path, &st) && st.st_size) {
191 char oldname[PATH_MAX];
194 snprintf(oldname, sizeof(oldname), "%s.old",
197 ret = rm_rf_perf_data(oldname);
199 pr_err("Can't remove old data: %s (%s)\n",
201 "Unknown file found" : strerror(errno),
206 if (rename(data->path, oldname)) {
207 pr_err("Can't move data: %s (%s to %s)\n",
209 data->path, oldname);
217 static bool is_dir(struct perf_data *data)
221 if (stat(data->path, &st))
224 return (st.st_mode & S_IFMT) == S_IFDIR;
227 static int open_file_read(struct perf_data *data)
231 char sbuf[STRERR_BUFSIZE];
233 fd = open(data->file.path, O_RDONLY);
237 pr_err("failed to open %s: %s", data->file.path,
238 str_error_r(err, sbuf, sizeof(sbuf)));
239 if (err == ENOENT && !strcmp(data->file.path, "perf.data"))
240 pr_err(" (try 'perf record' first)");
245 if (fstat(fd, &st) < 0)
248 if (!data->force && st.st_uid && (st.st_uid != geteuid())) {
249 pr_err("File %s not owned by current user or root (use -f to override)\n",
255 pr_info("zero-sized data (%s), nothing to do!\n",
260 data->file.size = st.st_size;
268 static int open_file_write(struct perf_data *data)
271 char sbuf[STRERR_BUFSIZE];
273 fd = open(data->file.path, O_CREAT|O_RDWR|O_TRUNC|O_CLOEXEC,
277 pr_err("failed to open %s : %s\n", data->file.path,
278 str_error_r(errno, sbuf, sizeof(sbuf)));
283 static int open_file(struct perf_data *data)
287 fd = perf_data__is_read(data) ?
288 open_file_read(data) : open_file_write(data);
291 zfree(&data->file.path);
299 static int open_file_dup(struct perf_data *data)
301 data->file.path = strdup(data->path);
302 if (!data->file.path)
305 return open_file(data);
308 static int open_dir(struct perf_data *data)
313 * So far we open only the header, so we can read the data version and
316 if (asprintf(&data->file.path, "%s/data", data->path) < 0)
319 if (perf_data__is_write(data) &&
320 mkdir(data->path, S_IRWXU) < 0)
323 ret = open_file(data);
325 /* Cleanup whatever we managed to create so far. */
326 if (ret && perf_data__is_write(data))
327 rm_rf_perf_data(data->path);
332 int perf_data__open(struct perf_data *data)
334 if (check_pipe(data))
338 data->path = "perf.data";
340 if (check_backup(data))
343 if (perf_data__is_read(data))
344 data->is_dir = is_dir(data);
346 return perf_data__is_dir(data) ?
347 open_dir(data) : open_file_dup(data);
350 void perf_data__close(struct perf_data *data)
352 if (perf_data__is_dir(data))
353 perf_data__close_dir(data);
355 zfree(&data->file.path);
356 close(data->file.fd);
359 ssize_t perf_data_file__write(struct perf_data_file *file,
360 void *buf, size_t size)
362 return writen(file->fd, buf, size);
365 ssize_t perf_data__write(struct perf_data *data,
366 void *buf, size_t size)
368 return perf_data_file__write(&data->file, buf, size);
371 int perf_data__switch(struct perf_data *data,
373 size_t pos, bool at_exit,
378 if (check_pipe(data))
380 if (perf_data__is_read(data))
383 if (asprintf(new_filepath, "%s.%s", data->path, postfix) < 0)
387 * Only fire a warning, don't return error, continue fill
390 if (rename(data->path, *new_filepath))
391 pr_warning("Failed to rename %s to %s\n", data->path, *new_filepath);
394 close(data->file.fd);
395 ret = perf_data__open(data);
399 if (lseek(data->file.fd, pos, SEEK_SET) == (off_t)-1) {
401 pr_debug("Failed to lseek to %zu: %s",
402 pos, strerror(errno));
411 unsigned long perf_data__size(struct perf_data *data)
413 u64 size = data->file.size;
416 if (perf_data__is_single_file(data))
419 for (i = 0; i < data->dir.nr; i++) {
420 struct perf_data_file *file = &data->dir.files[i];
428 int perf_data__make_kcore_dir(struct perf_data *data, char *buf, size_t buf_sz)
435 ret = snprintf(buf, buf_sz, "%s/kcore_dir", data->path);
436 if (ret < 0 || (size_t)ret >= buf_sz)
439 return mkdir(buf, S_IRWXU);
442 char *perf_data__kallsyms_name(struct perf_data *data)
450 if (asprintf(&kallsyms_name, "%s/kcore_dir/kallsyms", data->path) < 0)
453 if (stat(kallsyms_name, &st)) {
458 return kallsyms_name;