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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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#include "data.h"#include "util.h" // rm_rf_perf_data()#include "debug.h"#include "header.h"#include "rlimit.h"#include <internal/lib.h>
static void perf_data_file__close(struct perf_data_file *file){ if (file->use_stdio) { if (file->fptr) { fclose(file->fptr); file->fptr = NULL; } } else { close(file->fd); file->fd = -1; } zfree(&file->path);}
static void close_dir(struct perf_data_file *files, int nr){ while (--nr >= 0) perf_data_file__close(&files[nr]);
free(files);}
void perf_data__close_dir(struct perf_data *data){ close_dir(data->dir.files, data->dir.nr); data->dir.files = NULL; data->dir.nr = 0;}
int perf_data__create_dir(struct perf_data *data, int nr){ enum rlimit_action set_rlimit = NO_CHANGE; struct perf_data_file *files = NULL; int i, ret;
if (WARN_ON(!data->is_dir)) return -EINVAL;
files = calloc(nr, sizeof(*files)); if (!files) return -ENOMEM;
for (i = 0; i < nr; i++) { struct perf_data_file *file = &files[i];
ret = asprintf(&file->path, "%s/data.%d", data->path, i); if (ret < 0) { ret = -ENOMEM; goto out_err; }
retry_open: ret = open(file->path, O_RDWR|O_CREAT|O_TRUNC, S_IRUSR|S_IWUSR); if (ret < 0) { /* * If using parallel threads to collect data, * perf record needs at least 6 fds per CPU. * When we run out of them try to increase the limits. */ if (errno == EMFILE && rlimit__increase_nofile(&set_rlimit)) goto retry_open;
ret = -errno; goto out_err; } set_rlimit = NO_CHANGE;
file->fd = ret; }
data->dir.version = PERF_DIR_VERSION; data->dir.files = files; data->dir.nr = nr; return 0;
out_err: close_dir(files, i); return ret;}
int perf_data__open_dir(struct perf_data *data){ struct perf_data_file *files = NULL; struct dirent *dent; int ret = -1; DIR *dir; int nr = 0;
/* * Directory containing a single regular perf data file which is already * open, means there is nothing more to do here. */ if (perf_data__is_single_file(data)) return 0;
if (WARN_ON(!data->is_dir)) return -EINVAL;
/* The version is provided by DIR_FORMAT feature. */ if (WARN_ON(data->dir.version != PERF_DIR_VERSION)) return -1;
dir = opendir(data->path); if (!dir) return -EINVAL;
while ((dent = readdir(dir)) != NULL) { struct perf_data_file *file; char path[PATH_MAX]; struct stat st;
snprintf(path, sizeof(path), "%s/%s", data->path, dent->d_name); if (stat(path, &st)) continue;
if (!S_ISREG(st.st_mode) || strncmp(dent->d_name, "data.", 5)) continue;
ret = -ENOMEM;
file = realloc(files, (nr + 1) * sizeof(*files)); if (!file) goto out_err;
files = file; file = &files[nr++];
*file = (struct perf_data_file){ .path = strdup(path), .fd = -1, .size = st.st_size, .use_stdio = false, }; if (!file->path) goto out_err;
ret = open(file->path, O_RDONLY); if (ret < 0) { ret = -errno; goto out_err; } file->fd = ret; }
closedir(dir); if (!files) return -EINVAL;
data->dir.files = files; data->dir.nr = nr; return 0;
out_err: closedir(dir); close_dir(files, nr); return ret;}
static bool check_pipe(struct perf_data *data){ struct stat st; bool is_pipe = false; int fd = perf_data__is_read(data) ? STDIN_FILENO : STDOUT_FILENO;
if (!data->path) { if (!fstat(fd, &st) && S_ISFIFO(st.st_mode)) is_pipe = true; } else { if (!strcmp(data->path, "-")) is_pipe = true; }
if (is_pipe) { if (data->file.use_stdio) { const char *mode;
mode = perf_data__is_read(data) ? "r" : "w"; data->file.fptr = fdopen(fd, mode);
if (data->file.fptr == NULL) { data->file.fd = fd; data->file.use_stdio = false; }
/* * When is_pipe and data->file.fd is given, use given fd * instead of STDIN_FILENO or STDOUT_FILENO */ } else if (data->file.fd <= 0) { data->file.fd = fd; } }
return data->is_pipe = is_pipe;}
static int check_backup(struct perf_data *data){ struct stat st;
if (perf_data__is_read(data)) return 0;
if (!stat(data->path, &st) && st.st_size) { char oldname[PATH_MAX]; int ret;
snprintf(oldname, sizeof(oldname), "%s.old", data->path);
ret = rm_rf_perf_data(oldname); if (ret) { if (ret == -2) pr_err("Can't remove old data: Unknown file found (%s)\n", oldname); else pr_err("Can't remove old data: %m (%s)\n", oldname); return -1; }
if (rename(data->path, oldname)) { pr_err("Can't move data: %m (%s to %s)\n", data->path, oldname); return -1; } }
return 0;}
static bool is_dir(struct perf_data *data){ struct stat st;
if (stat(data->path, &st)) return false;
return (st.st_mode & S_IFMT) == S_IFDIR;}
static int open_file_read(struct perf_data *data){ int flags = data->in_place_update ? O_RDWR : O_RDONLY; struct stat st; int fd;
fd = open(data->file.path, flags); if (fd < 0) { int err = errno;
pr_err("failed to open %s: %m", data->file.path); if (err == ENOENT && !strcmp(data->file.path, "perf.data")) pr_err(" (try 'perf record' first)"); pr_err("\n"); return -err; }
if (fstat(fd, &st) < 0) goto out_close;
if (!data->force && st.st_uid && (st.st_uid != geteuid())) { pr_err("File %s not owned by current user or root (use -f to override)\n", data->file.path); goto out_close; }
if (!st.st_size) { pr_info("zero-sized data (%s), nothing to do!\n", data->file.path); goto out_close; }
data->file.size = st.st_size; return fd;
out_close: close(fd); return -1;}
static int open_file_write(struct perf_data *data){ int fd = open(data->file.path, O_CREAT|O_RDWR|O_TRUNC|O_CLOEXEC, S_IRUSR|S_IWUSR);
if (fd < 0) pr_err("failed to open %s : %m\n", data->file.path);
return fd;}
static int open_file(struct perf_data *data){ int fd;
fd = perf_data__is_read(data) ? open_file_read(data) : open_file_write(data);
if (fd < 0) { zfree(&data->file.path); return -1; }
data->file.fd = fd; return 0;}
static int open_file_dup(struct perf_data *data){ data->file.path = strdup(data->path); if (!data->file.path) return -ENOMEM;
return open_file(data);}
static int open_dir(struct perf_data *data){ int ret;
/* * So far we open only the header, so we can read the data version and * layout. */ if (asprintf(&data->file.path, "%s/data", data->path) < 0) return -1;
if (perf_data__is_write(data) && mkdir(data->path, S_IRWXU) < 0) return -1;
ret = open_file(data);
/* Cleanup whatever we managed to create so far. */ if (ret && perf_data__is_write(data)) rm_rf_perf_data(data->path);
return ret;}
int perf_data__open(struct perf_data *data){ if (check_pipe(data)) return 0;
/* currently it allows stdio for pipe only */ data->file.use_stdio = false;
if (!data->path) data->path = "perf.data";
if (check_backup(data)) return -1;
if (perf_data__is_read(data)) data->is_dir = is_dir(data);
return perf_data__is_dir(data) ? open_dir(data) : open_file_dup(data);}
void perf_data__close(struct perf_data *data){ if (perf_data__is_dir(data)) perf_data__close_dir(data);
perf_data_file__close(&data->file);}
static ssize_t perf_data_file__read(struct perf_data_file *file, void *buf, size_t size){ if (file->use_stdio) { if (fread(buf, size, 1, file->fptr) == 1) return size; return feof(file->fptr) ? 0 : -1; } return readn(file->fd, buf, size);}
ssize_t perf_data__read(struct perf_data *data, void *buf, size_t size){ return perf_data_file__read(&data->file, buf, size);}
ssize_t perf_data_file__write(struct perf_data_file *file, void *buf, size_t size){ if (file->use_stdio) { if (fwrite(buf, size, /*nmemb=*/1, file->fptr) == 1) return size; return -1; } return writen(file->fd, buf, size);}
ssize_t perf_data__write(struct perf_data *data, void *buf, size_t size){ return perf_data_file__write(&data->file, buf, size);}
off_t perf_data_file__seek(struct perf_data_file *file, off_t offset, int whence){ if (file->use_stdio) { off_t res = fseeko(file->fptr, offset, whence);
return res < 0 ? -1 : ftello(file->fptr); } return lseek(file->fd, offset, whence);}
off_t perf_data__seek(struct perf_data *data, off_t offset, int whence){ /* Note, a pipe fd will fail with -1 with errno of ESPIPE. */ return perf_data_file__seek(&data->file, offset, whence);}
int perf_data__switch(struct perf_data *data, const char *postfix, size_t pos, bool at_exit, char **new_filepath){ int ret;
if (perf_data__is_read(data)) return -EINVAL;
if (asprintf(new_filepath, "%s.%s", data->path, postfix) < 0) return -ENOMEM;
/* * Only fire a warning, don't return error, continue fill * original file. */ if (rename(data->path, *new_filepath)) pr_warning("Failed to rename %s to %s\n", data->path, *new_filepath);
if (!at_exit) { perf_data_file__close(&data->file); ret = perf_data__open(data); if (ret < 0) goto out;
if (perf_data__seek(data, pos, SEEK_SET) == (off_t)-1) { ret = -errno; pr_debug("Failed to seek to %zu: %m", pos); goto out; } } ret = perf_data__fd(data);out: return ret;}
unsigned long perf_data__size(struct perf_data *data){ u64 size = data->file.size; int i;
if (perf_data__is_single_file(data)) return size;
for (i = 0; i < data->dir.nr; i++) { struct perf_data_file *file = &data->dir.files[i];
size += file->size; }
return size;}
int perf_data__make_kcore_dir(struct perf_data *data, char *buf, size_t buf_sz){ int ret;
if (!data->is_dir) return -1;
ret = snprintf(buf, buf_sz, "%s/kcore_dir", data->path); if (ret < 0 || (size_t)ret >= buf_sz) return -1;
return mkdir(buf, S_IRWXU);}
bool has_kcore_dir(const char *path){ struct dirent *d = ERR_PTR(-EINVAL); const char *name = "kcore_dir"; DIR *dir = opendir(path); size_t n = strlen(name); bool result = false;
if (dir) { while (d && !result) { d = readdir(dir); result = d ? strncmp(d->d_name, name, n) : false; } closedir(dir); }
return result;}
char *perf_data__kallsyms_name(struct perf_data *data){ char *kallsyms_name; struct stat st;
if (!data->is_dir) return NULL;
if (asprintf(&kallsyms_name, "%s/kcore_dir/kallsyms", data->path) < 0) return NULL;
if (stat(kallsyms_name, &st)) { free(kallsyms_name); return NULL; }
return kallsyms_name;}
char *perf_data__guest_kallsyms_name(struct perf_data *data, pid_t machine_pid){ char *kallsyms_name; struct stat st;
if (!data->is_dir) return NULL;
if (asprintf(&kallsyms_name, "%s/kcore_dir__%d/kallsyms", data->path, machine_pid) < 0) return NULL;
if (stat(kallsyms_name, &st)) { free(kallsyms_name); return NULL; }
return kallsyms_name;}
bool is_perf_data(const char *path){ bool ret = false; FILE *file; u64 magic;
file = fopen(path, "r"); if (!file) return false;
if (fread(&magic, 1, 8, file) < 8) goto out;
ret = is_perf_magic(magic);out: fclose(file); return ret;}