linux-imx

// SPDX-License-Identifier: GPL-2.0

/*

 *  linux/fs/fcntl.c

 *

 *  Copyright (C) 1991, 1992  Linus Torvalds

 */

​

#include <linux/syscalls.h>

#include <linux/init.h>

#include <linux/mm.h>

#include <linux/sched/task.h>

#include <linux/fs.h>

#include <linux/file.h>

#include <linux/fdtable.h>

#include <linux/capability.h>

#include <linux/dnotify.h>

#include <linux/slab.h>

#include <linux/module.h>

#include <linux/pipe_fs_i.h>

#include <linux/security.h>

#include <linux/ptrace.h>

#include <linux/signal.h>

#include <linux/rcupdate.h>

#include <linux/pid_namespace.h>

#include <linux/user_namespace.h>

#include <linux/memfd.h>

#include <linux/compat.h>

​

#include <linux/poll.h>

#include <asm/siginfo.h>

#include <linux/uaccess.h>

​

#define SETFL_MASK (O_APPEND | O_NONBLOCK | O_NDELAY | O_DIRECT | O_NOATIME)

​

static int setfl(int fd, struct file * filp, unsigned long arg)

{

    struct inode * inode = file_inode(filp);

    int error = 0;

​

    /*

     * O_APPEND cannot be cleared if the file is marked as append-only

     * and the file is open for write.

     */

    if (((arg ^ filp->f_flags) & O_APPEND) && IS_APPEND(inode))

        return -EPERM;

​

    /* O_NOATIME can only be set by the owner or superuser */

    if ((arg & O_NOATIME) && !(filp->f_flags & O_NOATIME))

        if (!inode_owner_or_capable(inode))

            return -EPERM;

​

    /* required for strict SunOS emulation */

    if (O_NONBLOCK != O_NDELAY)

           if (arg & O_NDELAY)

           arg |= O_NONBLOCK;

​

    /* Pipe packetized mode is controlled by O_DIRECT flag */

    if (!S_ISFIFO(inode->i_mode) && (arg & O_DIRECT)) {

        if (!filp->f_mapping || !filp->f_mapping->a_ops ||

            !filp->f_mapping->a_ops->direct_IO)

                return -EINVAL;

    }

​