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515 lines
9.4 KiB
515 lines
9.4 KiB
// SPDX-License-Identifier: GPL-2.0 |
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#include <linux/compiler.h> |
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#include <linux/kernel.h> |
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#include <linux/string.h> |
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#include <linux/zalloc.h> |
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#include <sys/types.h> |
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#include <sys/stat.h> |
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#include <errno.h> |
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#include <fcntl.h> |
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#include <unistd.h> |
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#include <string.h> |
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#include <asm/bug.h> |
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#include <dirent.h> |
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#include "data.h" |
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#include "util.h" // rm_rf_perf_data() |
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#include "debug.h" |
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#include "header.h" |
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#include <internal/lib.h> |
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static void close_dir(struct perf_data_file *files, int nr) |
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{ |
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while (--nr >= 0) { |
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close(files[nr].fd); |
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zfree(&files[nr].path); |
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} |
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free(files); |
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} |
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void perf_data__close_dir(struct perf_data *data) |
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{ |
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close_dir(data->dir.files, data->dir.nr); |
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} |
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int perf_data__create_dir(struct perf_data *data, int nr) |
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{ |
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struct perf_data_file *files = NULL; |
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int i, ret; |
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if (WARN_ON(!data->is_dir)) |
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return -EINVAL; |
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files = zalloc(nr * sizeof(*files)); |
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if (!files) |
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return -ENOMEM; |
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data->dir.version = PERF_DIR_VERSION; |
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data->dir.files = files; |
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data->dir.nr = nr; |
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for (i = 0; i < nr; i++) { |
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struct perf_data_file *file = &files[i]; |
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ret = asprintf(&file->path, "%s/data.%d", data->path, i); |
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if (ret < 0) |
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goto out_err; |
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ret = open(file->path, O_RDWR|O_CREAT|O_TRUNC, S_IRUSR|S_IWUSR); |
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if (ret < 0) |
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goto out_err; |
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file->fd = ret; |
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} |
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return 0; |
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out_err: |
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close_dir(files, i); |
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return ret; |
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} |
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int perf_data__open_dir(struct perf_data *data) |
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{ |
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struct perf_data_file *files = NULL; |
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struct dirent *dent; |
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int ret = -1; |
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DIR *dir; |
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int nr = 0; |
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/* |
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* Directory containing a single regular perf data file which is already |
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* open, means there is nothing more to do here. |
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*/ |
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if (perf_data__is_single_file(data)) |
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return 0; |
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if (WARN_ON(!data->is_dir)) |
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return -EINVAL; |
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/* The version is provided by DIR_FORMAT feature. */ |
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if (WARN_ON(data->dir.version != PERF_DIR_VERSION)) |
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return -1; |
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dir = opendir(data->path); |
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if (!dir) |
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return -EINVAL; |
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while ((dent = readdir(dir)) != NULL) { |
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struct perf_data_file *file; |
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char path[PATH_MAX]; |
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struct stat st; |
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snprintf(path, sizeof(path), "%s/%s", data->path, dent->d_name); |
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if (stat(path, &st)) |
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continue; |
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if (!S_ISREG(st.st_mode) || strncmp(dent->d_name, "data.", 5)) |
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continue; |
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ret = -ENOMEM; |
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file = realloc(files, (nr + 1) * sizeof(*files)); |
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if (!file) |
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goto out_err; |
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files = file; |
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file = &files[nr++]; |
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file->path = strdup(path); |
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if (!file->path) |
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goto out_err; |
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ret = open(file->path, O_RDONLY); |
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if (ret < 0) |
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goto out_err; |
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file->fd = ret; |
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file->size = st.st_size; |
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} |
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if (!files) |
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return -EINVAL; |
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data->dir.files = files; |
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data->dir.nr = nr; |
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return 0; |
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out_err: |
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close_dir(files, nr); |
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return ret; |
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} |
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int perf_data__update_dir(struct perf_data *data) |
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{ |
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int i; |
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if (WARN_ON(!data->is_dir)) |
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return -EINVAL; |
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for (i = 0; i < data->dir.nr; i++) { |
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struct perf_data_file *file = &data->dir.files[i]; |
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struct stat st; |
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if (fstat(file->fd, &st)) |
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return -1; |
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file->size = st.st_size; |
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} |
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return 0; |
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} |
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static bool check_pipe(struct perf_data *data) |
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{ |
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struct stat st; |
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bool is_pipe = false; |
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int fd = perf_data__is_read(data) ? |
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STDIN_FILENO : STDOUT_FILENO; |
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if (!data->path) { |
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if (!fstat(fd, &st) && S_ISFIFO(st.st_mode)) |
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is_pipe = true; |
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} else { |
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if (!strcmp(data->path, "-")) |
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is_pipe = true; |
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} |
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if (is_pipe) { |
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if (data->use_stdio) { |
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const char *mode; |
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mode = perf_data__is_read(data) ? "r" : "w"; |
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data->file.fptr = fdopen(fd, mode); |
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if (data->file.fptr == NULL) { |
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data->file.fd = fd; |
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data->use_stdio = false; |
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} |
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} else { |
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data->file.fd = fd; |
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} |
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} |
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return data->is_pipe = is_pipe; |
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} |
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static int check_backup(struct perf_data *data) |
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{ |
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struct stat st; |
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if (perf_data__is_read(data)) |
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return 0; |
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if (!stat(data->path, &st) && st.st_size) { |
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char oldname[PATH_MAX]; |
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int ret; |
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snprintf(oldname, sizeof(oldname), "%s.old", |
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data->path); |
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ret = rm_rf_perf_data(oldname); |
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if (ret) { |
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pr_err("Can't remove old data: %s (%s)\n", |
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ret == -2 ? |
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"Unknown file found" : strerror(errno), |
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oldname); |
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return -1; |
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} |
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if (rename(data->path, oldname)) { |
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pr_err("Can't move data: %s (%s to %s)\n", |
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strerror(errno), |
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data->path, oldname); |
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return -1; |
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} |
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} |
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return 0; |
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} |
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static bool is_dir(struct perf_data *data) |
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{ |
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struct stat st; |
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if (stat(data->path, &st)) |
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return false; |
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return (st.st_mode & S_IFMT) == S_IFDIR; |
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} |
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static int open_file_read(struct perf_data *data) |
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{ |
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int flags = data->in_place_update ? O_RDWR : O_RDONLY; |
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struct stat st; |
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int fd; |
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char sbuf[STRERR_BUFSIZE]; |
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fd = open(data->file.path, flags); |
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if (fd < 0) { |
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int err = errno; |
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pr_err("failed to open %s: %s", data->file.path, |
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str_error_r(err, sbuf, sizeof(sbuf))); |
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if (err == ENOENT && !strcmp(data->file.path, "perf.data")) |
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pr_err(" (try 'perf record' first)"); |
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pr_err("\n"); |
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return -err; |
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} |
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if (fstat(fd, &st) < 0) |
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goto out_close; |
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if (!data->force && st.st_uid && (st.st_uid != geteuid())) { |
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pr_err("File %s not owned by current user or root (use -f to override)\n", |
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data->file.path); |
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goto out_close; |
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} |
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if (!st.st_size) { |
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pr_info("zero-sized data (%s), nothing to do!\n", |
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data->file.path); |
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goto out_close; |
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} |
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data->file.size = st.st_size; |
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return fd; |
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out_close: |
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close(fd); |
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return -1; |
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} |
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static int open_file_write(struct perf_data *data) |
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{ |
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int fd; |
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char sbuf[STRERR_BUFSIZE]; |
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fd = open(data->file.path, O_CREAT|O_RDWR|O_TRUNC|O_CLOEXEC, |
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S_IRUSR|S_IWUSR); |
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if (fd < 0) |
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pr_err("failed to open %s : %s\n", data->file.path, |
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str_error_r(errno, sbuf, sizeof(sbuf))); |
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return fd; |
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} |
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static int open_file(struct perf_data *data) |
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{ |
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int fd; |
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fd = perf_data__is_read(data) ? |
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open_file_read(data) : open_file_write(data); |
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if (fd < 0) { |
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zfree(&data->file.path); |
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return -1; |
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} |
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data->file.fd = fd; |
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return 0; |
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} |
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static int open_file_dup(struct perf_data *data) |
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{ |
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data->file.path = strdup(data->path); |
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if (!data->file.path) |
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return -ENOMEM; |
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return open_file(data); |
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} |
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static int open_dir(struct perf_data *data) |
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{ |
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int ret; |
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/* |
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* So far we open only the header, so we can read the data version and |
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* layout. |
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*/ |
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if (asprintf(&data->file.path, "%s/data", data->path) < 0) |
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return -1; |
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if (perf_data__is_write(data) && |
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mkdir(data->path, S_IRWXU) < 0) |
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return -1; |
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ret = open_file(data); |
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/* Cleanup whatever we managed to create so far. */ |
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if (ret && perf_data__is_write(data)) |
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rm_rf_perf_data(data->path); |
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return ret; |
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} |
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int perf_data__open(struct perf_data *data) |
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{ |
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if (check_pipe(data)) |
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return 0; |
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/* currently it allows stdio for pipe only */ |
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data->use_stdio = false; |
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if (!data->path) |
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data->path = "perf.data"; |
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if (check_backup(data)) |
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return -1; |
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if (perf_data__is_read(data)) |
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data->is_dir = is_dir(data); |
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return perf_data__is_dir(data) ? |
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open_dir(data) : open_file_dup(data); |
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} |
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void perf_data__close(struct perf_data *data) |
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{ |
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if (perf_data__is_dir(data)) |
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perf_data__close_dir(data); |
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zfree(&data->file.path); |
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if (data->use_stdio) |
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fclose(data->file.fptr); |
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else |
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close(data->file.fd); |
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} |
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ssize_t perf_data__read(struct perf_data *data, void *buf, size_t size) |
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{ |
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if (data->use_stdio) { |
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if (fread(buf, size, 1, data->file.fptr) == 1) |
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return size; |
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return feof(data->file.fptr) ? 0 : -1; |
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} |
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return readn(data->file.fd, buf, size); |
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} |
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ssize_t perf_data_file__write(struct perf_data_file *file, |
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void *buf, size_t size) |
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{ |
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return writen(file->fd, buf, size); |
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} |
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ssize_t perf_data__write(struct perf_data *data, |
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void *buf, size_t size) |
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{ |
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if (data->use_stdio) { |
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if (fwrite(buf, size, 1, data->file.fptr) == 1) |
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return size; |
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return -1; |
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} |
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return perf_data_file__write(&data->file, buf, size); |
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} |
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int perf_data__switch(struct perf_data *data, |
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const char *postfix, |
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size_t pos, bool at_exit, |
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char **new_filepath) |
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{ |
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int ret; |
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if (check_pipe(data)) |
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return -EINVAL; |
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if (perf_data__is_read(data)) |
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return -EINVAL; |
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if (asprintf(new_filepath, "%s.%s", data->path, postfix) < 0) |
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return -ENOMEM; |
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/* |
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* Only fire a warning, don't return error, continue fill |
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* original file. |
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*/ |
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if (rename(data->path, *new_filepath)) |
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pr_warning("Failed to rename %s to %s\n", data->path, *new_filepath); |
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if (!at_exit) { |
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close(data->file.fd); |
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ret = perf_data__open(data); |
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if (ret < 0) |
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goto out; |
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if (lseek(data->file.fd, pos, SEEK_SET) == (off_t)-1) { |
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ret = -errno; |
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pr_debug("Failed to lseek to %zu: %s", |
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pos, strerror(errno)); |
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goto out; |
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} |
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} |
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ret = data->file.fd; |
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out: |
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return ret; |
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} |
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unsigned long perf_data__size(struct perf_data *data) |
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{ |
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u64 size = data->file.size; |
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int i; |
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if (perf_data__is_single_file(data)) |
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return size; |
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for (i = 0; i < data->dir.nr; i++) { |
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struct perf_data_file *file = &data->dir.files[i]; |
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size += file->size; |
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} |
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return size; |
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} |
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int perf_data__make_kcore_dir(struct perf_data *data, char *buf, size_t buf_sz) |
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{ |
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int ret; |
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if (!data->is_dir) |
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return -1; |
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ret = snprintf(buf, buf_sz, "%s/kcore_dir", data->path); |
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if (ret < 0 || (size_t)ret >= buf_sz) |
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return -1; |
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return mkdir(buf, S_IRWXU); |
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} |
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char *perf_data__kallsyms_name(struct perf_data *data) |
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{ |
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char *kallsyms_name; |
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struct stat st; |
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if (!data->is_dir) |
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return NULL; |
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if (asprintf(&kallsyms_name, "%s/kcore_dir/kallsyms", data->path) < 0) |
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return NULL; |
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if (stat(kallsyms_name, &st)) { |
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free(kallsyms_name); |
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return NULL; |
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} |
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return kallsyms_name; |
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} |
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bool is_perf_data(const char *path) |
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{ |
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bool ret = false; |
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FILE *file; |
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u64 magic; |
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file = fopen(path, "r"); |
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if (!file) |
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return false; |
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if (fread(&magic, 1, 8, file) < 8) |
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goto out; |
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ret = is_perf_magic(magic); |
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out: |
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fclose(file); |
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return ret; |
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}
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