// SPDX-License-Identifier: GPL-2.0
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/file.h>
#include <linux/io_uring.h>

#include <uapi/linux/io_uring.h>

#include "../fs/internal.h"

#include "io_uring.h"
#include "statx.h"

struct io_statx {
        struct file                     *file;
        int                             dfd;
        unsigned int                    mask;
        unsigned int                    flags;
        struct delayed_filename         filename;
        struct statx __user             *buffer;
};

int io_statx_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
{
        struct io_statx *sx = io_kiocb_to_cmd(req, struct io_statx);
        const char __user *path;
        int ret;

        if (sqe->buf_index || sqe->splice_fd_in)
                return -EINVAL;
        if (req->flags & REQ_F_FIXED_FILE)
                return -EBADF;

        sx->dfd = READ_ONCE(sqe->fd);
        sx->mask = READ_ONCE(sqe->len);
        path = u64_to_user_ptr(READ_ONCE(sqe->addr));
        sx->buffer = u64_to_user_ptr(READ_ONCE(sqe->addr2));
        sx->flags = READ_ONCE(sqe->statx_flags);

        ret = delayed_getname_uflags(&sx->filename, path, sx->flags);

        if (unlikely(ret))
                return ret;

        req->flags |= REQ_F_NEED_CLEANUP;
        req->flags |= REQ_F_FORCE_ASYNC;
        return 0;
}

int io_statx(struct io_kiocb *req, unsigned int issue_flags)
{
        struct io_statx *sx = io_kiocb_to_cmd(req, struct io_statx);
        CLASS(filename_complete_delayed, name)(&sx->filename);
        int ret;

        WARN_ON_ONCE(issue_flags & IO_URING_F_NONBLOCK);

        ret = do_statx(sx->dfd, name, sx->flags, sx->mask, sx->buffer);
        io_req_set_res(req, ret, 0);
        return IOU_COMPLETE;
}

void io_statx_cleanup(struct io_kiocb *req)
{
        struct io_statx *sx = io_kiocb_to_cmd(req, struct io_statx);

        dismiss_delayed_filename(&sx->filename);
}