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/*-
 * Copyright (c) 2010 Isilon Systems, Inc.
 * Copyright (c) 2010 iX Systems, Inc.
 * Copyright (c) 2010 Panasas, Inc.
 * Copyright (c) 2013 Mellanox Technologies, Ltd.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice unmodified, this list of conditions, and the following
 *    disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * $FreeBSD$
 */
#ifndef	_LINUX_FS_H_
#define	_LINUX_FS_H_

#include <sys/cdefs.h>
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/conf.h>
#include <sys/vnode.h>
#include <sys/file.h>
#include <sys/filedesc.h>
#include <linux/types.h>
#include <linux/wait.h>
#include <linux/semaphore.h>

struct module;
struct kiocb;
struct iovec;
struct dentry;
struct page;
struct file_lock;
struct pipe_inode_info;
struct vm_area_struct;
struct poll_table_struct;
struct files_struct;

#define	inode	vnode
#define	i_cdev	v_rdev

#define	S_IRUGO	(S_IRUSR | S_IRGRP | S_IROTH)
#define	S_IWUGO	(S_IWUSR | S_IWGRP | S_IWOTH)


typedef struct files_struct *fl_owner_t;

struct dentry {
	struct inode	*d_inode;
};

struct file_operations;

struct linux_file {
	struct file	*_file;
	const struct file_operations	*f_op;
	void 		*private_data;
	int		f_flags;
	int		f_mode;	/* Just starting mode. */
	struct dentry	*f_dentry;
	struct dentry	f_dentry_store;
	struct selinfo	f_selinfo;
	struct sigio	*f_sigio;
	struct vnode	*f_vnode;
};

#define	file		linux_file
#define	fasync_struct	sigio *

#define	fasync_helper(fd, filp, on, queue)				\
({									\
	if ((on))							\
		*(queue) = &(filp)->f_sigio;				\
	else								\
		*(queue) = NULL;					\
	0;								\
})

#define	kill_fasync(queue, sig, pollstat)				\
do {									\
	if (*(queue) != NULL)						\
		pgsigio(*(queue), (sig), 0);				\
} while (0)

typedef int (*filldir_t)(void *, const char *, int, loff_t, u64, unsigned);

struct file_operations {
	struct module *owner;
	ssize_t (*read)(struct file *, char __user *, size_t, loff_t *);
	ssize_t (*write)(struct file *, const char __user *, size_t, loff_t *);
	unsigned int (*poll) (struct file *, struct poll_table_struct *);
	long (*unlocked_ioctl)(struct file *, unsigned int, unsigned long);
	int (*mmap)(struct file *, struct vm_area_struct *);
	int (*open)(struct inode *, struct file *);
	int (*release)(struct inode *, struct file *);
	int (*fasync)(int, struct file *, int);

/* Although not supported in FreeBSD, to align with Linux code
 * we are adding llseek() only when it is mapped to no_llseek which returns 
 * an illegal seek error
 */
	loff_t (*llseek)(struct file *, loff_t, int);
#if 0
	/* We do not support these methods.  Don't permit them to compile. */
	loff_t (*llseek)(struct file *, loff_t, int);
	ssize_t (*aio_read)(struct kiocb *, const struct iovec *,
	    unsigned long, loff_t);
	ssize_t (*aio_write)(struct kiocb *, const struct iovec *,
	    unsigned long, loff_t);
	int (*readdir)(struct file *, void *, filldir_t);
	int (*ioctl)(struct inode *, struct file *, unsigned int,
	    unsigned long);
	long (*compat_ioctl)(struct file *, unsigned int, unsigned long);
	int (*flush)(struct file *, fl_owner_t id);
	int (*fsync)(struct file *, struct dentry *, int datasync);
	int (*aio_fsync)(struct kiocb *, int datasync);
	int (*lock)(struct file *, int, struct file_lock *);
	ssize_t (*sendpage)(struct file *, struct page *, int, size_t,
	    loff_t *, int);
	unsigned long (*get_unmapped_area)(struct file *, unsigned long,
	    unsigned long, unsigned long, unsigned long);
	int (*check_flags)(int);
	int (*flock)(struct file *, int, struct file_lock *);
	ssize_t (*splice_write)(struct pipe_inode_info *, struct file *,
	    loff_t *, size_t, unsigned int);
	ssize_t (*splice_read)(struct file *, loff_t *,
	    struct pipe_inode_info *, size_t, unsigned int);
	int (*setlease)(struct file *, long, struct file_lock **);
#endif
};
#define	fops_get(fops)	(fops)

#define	FMODE_READ	FREAD
#define	FMODE_WRITE	FWRITE
#define	FMODE_EXEC	FEXEC

static inline int
register_chrdev_region(dev_t dev, unsigned range, const char *name)
{

	return 0;
}

static inline void
unregister_chrdev_region(dev_t dev, unsigned range)
{

	return;
}

static inline int
alloc_chrdev_region(dev_t *dev, unsigned baseminor, unsigned count,
			const char *name)
{

	return 0;
}

/* No current support for seek op in FreeBSD */
static inline int
nonseekable_open(struct inode *inode, struct file *filp)
{
	return 0;
}

static inline dev_t
iminor(struct inode *inode)
{

	return dev2unit(inode->v_rdev);
}

static inline struct inode *
igrab(struct inode *inode)
{
	int error;

	error = vget(inode, 0, curthread);
	if (error)
		return (NULL);

	return (inode);
}

static inline void
iput(struct inode *inode)
{

	vrele(inode);
}

static inline loff_t 
no_llseek(struct file *file, loff_t offset, int whence)
{
        return -ESPIPE;
}

#endif /* _LINUX_FS_H_ */