fs.h revision 271127 
1/*-
2 * Copyright (c) 2010 Isilon Systems, Inc.
3 * Copyright (c) 2010 iX Systems, Inc.
4 * Copyright (c) 2010 Panasas, Inc.
5 * Copyright (c) 2013 Mellanox Technologies, Ltd.
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice unmodified, this list of conditions, and the following
13 *    disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 *    notice, this list of conditions and the following disclaimer in the
16 *    documentation and/or other materials provided with the distribution.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 */
29#ifndef	_LINUX_FS_H_
30#define	_LINUX_FS_H_
31
32#include <sys/systm.h>
33#include <sys/conf.h>
34#include <sys/vnode.h>
35#include <sys/file.h>
36#include <sys/filedesc.h>
37#include <linux/types.h>
38#include <linux/wait.h>
39#include <linux/semaphore.h>
40
41struct module;
42struct kiocb;
43struct iovec;
44struct dentry;
45struct page;
46struct file_lock;
47struct pipe_inode_info;
48struct vm_area_struct;
49struct poll_table_struct;
50struct files_struct;
51
52#define	inode	vnode
53#define	i_cdev	v_rdev
54
55#define	S_IRUGO	(S_IRUSR | S_IRGRP | S_IROTH)
56#define	S_IWUGO	(S_IWUSR | S_IWGRP | S_IWOTH)
57
58
59typedef struct files_struct *fl_owner_t;
60
61struct dentry {
62	struct inode	*d_inode;
63};
64
65struct file_operations;
66
67struct linux_file {
68	struct file	*_file;
69	const struct file_operations	*f_op;
70	void 		*private_data;
71	int		f_flags;
72	int		f_mode;	/* Just starting mode. */
73	struct dentry	*f_dentry;
74	struct dentry	f_dentry_store;
75	struct selinfo	f_selinfo;
76	struct sigio	*f_sigio;
77	struct vnode	*f_vnode;
78};
79
80#define	file		linux_file
81#define	fasync_struct	sigio *
82
83#define	fasync_helper(fd, filp, on, queue)				\
84({									\
85	if ((on))							\
86		*(queue) = &(filp)->f_sigio;				\
87	else								\
88		*(queue) = NULL;					\
89	0;								\
90})
91
92#define	kill_fasync(queue, sig, pollstat)				\
93do {									\
94	if (*(queue) != NULL)						\
95		pgsigio(*(queue), (sig), 0);				\
96} while (0)
97
98typedef int (*filldir_t)(void *, const char *, int, loff_t, u64, unsigned);
99
100struct file_operations {
101	struct module *owner;
102	ssize_t (*read)(struct file *, char __user *, size_t, loff_t *);
103	ssize_t (*write)(struct file *, const char __user *, size_t, loff_t *);
104	unsigned int (*poll) (struct file *, struct poll_table_struct *);
105	long (*unlocked_ioctl)(struct file *, unsigned int, unsigned long);
106	int (*mmap)(struct file *, struct vm_area_struct *);
107	int (*open)(struct inode *, struct file *);
108	int (*release)(struct inode *, struct file *);
109	int (*fasync)(int, struct file *, int);
110
111/* Although not supported in FreeBSD, to align with Linux code
112 * we are adding llseek() only when it is mapped to no_llseek which returns
113 * an illegal seek error
114 */
115	loff_t (*llseek)(struct file *, loff_t, int);
116#if 0
117	/* We do not support these methods.  Don't permit them to compile. */
118	loff_t (*llseek)(struct file *, loff_t, int);
119	ssize_t (*aio_read)(struct kiocb *, const struct iovec *,
120	    unsigned long, loff_t);
121	ssize_t (*aio_write)(struct kiocb *, const struct iovec *,
122	    unsigned long, loff_t);
123	int (*readdir)(struct file *, void *, filldir_t);
124	int (*ioctl)(struct inode *, struct file *, unsigned int,
125	    unsigned long);
126	long (*compat_ioctl)(struct file *, unsigned int, unsigned long);
127	int (*flush)(struct file *, fl_owner_t id);
128	int (*fsync)(struct file *, struct dentry *, int datasync);
129	int (*aio_fsync)(struct kiocb *, int datasync);
130	int (*lock)(struct file *, int, struct file_lock *);
131	ssize_t (*sendpage)(struct file *, struct page *, int, size_t,
132	    loff_t *, int);
133	unsigned long (*get_unmapped_area)(struct file *, unsigned long,
134	    unsigned long, unsigned long, unsigned long);
135	int (*check_flags)(int);
136	int (*flock)(struct file *, int, struct file_lock *);
137	ssize_t (*splice_write)(struct pipe_inode_info *, struct file *,
138	    loff_t *, size_t, unsigned int);
139	ssize_t (*splice_read)(struct file *, loff_t *,
140	    struct pipe_inode_info *, size_t, unsigned int);
141	int (*setlease)(struct file *, long, struct file_lock **);
142#endif
143};
144#define	fops_get(fops)	(fops)
145
146#define	FMODE_READ	FREAD
147#define	FMODE_WRITE	FWRITE
148#define	FMODE_EXEC	FEXEC
149
150static inline int
151register_chrdev_region(dev_t dev, unsigned range, const char *name)
152{
153
154	return 0;
155}
156
157static inline void
158unregister_chrdev_region(dev_t dev, unsigned range)
159{
160
161	return;
162}
163
164static inline int
165alloc_chrdev_region(dev_t *dev, unsigned baseminor, unsigned count,
166			const char *name)
167{
168
169	return 0;
170}
171
172/* No current support for seek op in FreeBSD */
173static inline int
174nonseekable_open(struct inode *inode, struct file *filp)
175{
176	return 0;
177}
178
179static inline dev_t
180iminor(struct inode *inode)
181{
182
183	return dev2unit(inode->v_rdev);
184}
185
186static inline struct inode *
187igrab(struct inode *inode)
188{
189	int error;
190
191	error = vget(inode, 0, curthread);
192	if (error)
193		return (NULL);
194
195	return (inode);
196}
197
198static inline void
199iput(struct inode *inode)
200{
201
202	vrele(inode);
203}
204
205static inline loff_t
206no_llseek(struct file *file, loff_t offset, int whence)
207{
208        return -ESPIPE;
209}
210
211#endif /* _LINUX_FS_H_ */
212