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| | #include "compat-util.h"
#include <dirent.h>
#include <libgen.h>
#include <dlfcn.h>
#if defined(_POSIX_SYNCHRONIZED_IO) && _POSIX_SYNCHRONIZED_IO > 0
static int have_fdatasync = 1;
#else
static int have_fdatasync;
#endif
/* TODO: sync_file_range() if on Linux */
static int usage(const char * argv0)
{
fprintf(stderr, "Usage: %s [-d] [-D] FILE...\n", argv0);
return 1;
}
#define FN_NOT_FOUND ((void *)(1))
static int fs_sync(const char *path)
{
int rc = 0;
#if defined(__linux__) && defined(RTLD_NEXT)
static int (*syncfs_fn)(int);
if (syncfs_fn == NULL) {
syncfs_fn = dlsym(RTLD_DEFAULT, "syncfs");
if (syncfs_fn == NULL || dlerror())
syncfs_fn = FN_NOT_FOUND;
}
if (syncfs_fn != NULL && syncfs_fn != FN_NOT_FOUND) {
int fd = open(path, O_RDONLY|O_NOATIME);
if (fd >= 0) {
int err;
rc = syncfs_fn(fd);
err = errno;
close(fd);
/*
* if glibc has syncfs(2) but we're running an
* old kernel, fall back to sync(2) below
*/
if (err != ENOSYS)
return rc;
rc = 0;
}
}
#endif /* ! __linux__ */
sync();
return rc;
}
static int do_sync(const char *path, int data_only, int directory)
{
int fd;
const char *errfunc = "";
if ((fd = open(path, O_RDWR|O_NOATIME)) < 0) {
if (errno == EISDIR) {
directory = 1;
goto sync_dir;
}
errfunc = "open";
goto err;
}
if (data_only && have_fdatasync) {
if (fdatasync(fd) < 0) {
errfunc = "fdatasync";
goto err;
}
} else {
if (fsync(fd) < 0) {
errfunc = "fsync";
goto err;
}
}
if (close(fd) < 0) {
errfunc = "close";
goto err;
}
sync_dir:
if (directory) {
char *dpath;
DIR *dir;
if (!(dpath = strdup(path))){
errfunc = "strdup";
goto err;
}
if (!(dir = opendir(dirname(dpath)))) {
errfunc = "opendir";
goto err;
}
if (fsync(dirfd(dir)) < 0) {
errfunc = "(directory) fsync";
goto err;
}
if (closedir(dir) < 0) {
errfunc = "closedir";
goto err;
}
free(dpath);
}
return 0;
err:
fprintf(stderr, "%s: %s(): %s\n", path, errfunc, strerror(errno));
return -1;
}
int main(int argc, char * const argv[])
{
int data_only = 0;
int fs = 0;
int directory = 0;
int opt;
int argi = 1;
while ((opt = getopt(argc, argv, "dDf")) != -1) {
++argi;
switch(opt) {
case 'd':
data_only = 1;
break;
case 'D':
directory = 1;
break;
case 'f':
fs = 1;
break;
default:
return usage(argv[0]);
}
}
if (argi >= argc)
return usage(argv[0]);
for (; argi < argc; ++argi) {
if (fs) {
if (fs_sync(argv[argi]) < 0)
return 1;
} else {
if (do_sync(argv[argi], data_only, directory) < 0)
return 1;
}
}
return 0;
}
|