test/release_unlink_race.c

/*
  This program can be distributed under the terms of the GNU GPLv2.
  See the file GPL2.txt.
*/

#define FUSE_USE_VERSION 31

#define _GNU_SOURCE

#include <fuse.h>

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>

static void *xmp_init(struct fuse_conn_info *conn,
		      struct fuse_config *cfg)
{
	(void) conn;

	cfg->use_ino = 1;
	cfg->nullpath_ok = 1;
	cfg->entry_timeout = 0;
	cfg->attr_timeout = 0;
	cfg->negative_timeout = 0;

	return NULL;
}

static int xmp_getattr(const char *path, struct stat *stbuf,
			struct fuse_file_info *fi)
{
	int res;

	(void) path;

	if(fi)
		res = fstat(fi->fh, stbuf);
	else
		res = lstat(path, stbuf);
	if (res == -1)
		return -errno;

	return 0;
}

static int xmp_unlink(const char *path)
{
	int res;

	res = unlink(path);
	if (res == -1)
		return -errno;

	return 0;
}

static int xmp_rename(const char *from, const char *to, unsigned int flags)
{
	int res;

	if (flags)
		return -EINVAL;

        if(!getenv("RELEASEUNLINKRACE_DELAY_DISABLE")) usleep(100000);

	res = rename(from, to);
	if (res == -1)
		return -errno;

	return 0;
}

static int xmp_create(const char *path, mode_t mode, struct fuse_file_info *fi)
{
	int fd;

	fd = open(path, fi->flags, mode);
	if (fd == -1)
		return -errno;

	fi->fh = fd;
	return 0;
}

static int xmp_release(const char *path, struct fuse_file_info *fi)
{
	(void) path;

        if(!getenv("RELEASEUNLINKRACE_DELAY_DISABLE")) usleep(100000);

	close(fi->fh);

	return 0;
}

static const struct fuse_operations xmp_oper = {
	.init           = xmp_init,
	.getattr	= xmp_getattr,
	.unlink		= xmp_unlink,
	.rename		= xmp_rename,
	.create		= xmp_create,
	.release	= xmp_release,
};

int main(int argc, char *argv[])
{
	umask(0);
	return fuse_main(argc, argv, &xmp_oper, NULL);
}