file.h revision 219820 
1/*-
2 * Copyright (c) 2010 Isilon Systems, Inc.
3 * Copyright (c) 2010 iX Systems, Inc.
4 * Copyright (c) 2010 Panasas, Inc.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice unmodified, this list of conditions, and the following
12 *    disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 */
28#ifndef	_LINUX_FILE_H_
29#define	_LINUX_FILE_H_
30
31#include <sys/param.h>
32#include <sys/file.h>
33#include <sys/filedesc.h>
34#include <sys/refcount.h>
35#include <sys/proc.h>
36
37#include <linux/fs.h>
38
39struct linux_file;
40
41#undef file
42
43extern struct fileops linuxfileops;
44
45static inline struct linux_file *
46linux_fget(unsigned int fd)
47{
48	struct file *file;
49
50	file = fget_unlocked(curthread->td_proc->p_fd, fd);
51	return (struct linux_file *)file->f_data;
52}
53
54static inline void
55fput(struct linux_file *filp)
56{
57	if (filp->_file == NULL) {
58		kfree(filp);
59		return;
60	}
61	if (refcount_release(&filp->_file->f_count)) {
62		_fdrop(filp->_file, curthread);
63		kfree(filp);
64	}
65}
66
67static inline void
68put_unused_fd(unsigned int fd)
69{
70	struct file *file;
71
72	file = fget_unlocked(curthread->td_proc->p_fd, fd);
73	if (file == NULL)
74		return;
75	fdclose(curthread->td_proc->p_fd, file, fd, curthread);
76}
77
78static inline void
79fd_install(unsigned int fd, struct linux_file *filp)
80{
81	struct file *file;
82
83	file = fget_unlocked(curthread->td_proc->p_fd, fd);
84	filp->_file = file;
85        finit(file, filp->f_mode, DTYPE_DEV, filp, &linuxfileops);
86}
87
88static inline int
89get_unused_fd(void)
90{
91	struct file *file;
92	int error;
93	int fd;
94
95	error = falloc(curthread, &file, &fd);
96	if (error)
97		return -error;
98	return fd;
99}
100
101static inline struct linux_file *
102_alloc_file(int mode, const struct file_operations *fops)
103{
104	struct linux_file *filp;
105
106	filp = kzalloc(sizeof(*filp), GFP_KERNEL);
107	if (filp == NULL)
108		return (NULL);
109	filp->f_op = fops;
110	filp->f_mode = mode;
111
112	return filp;
113}
114
115#define	alloc_file(mnt, root, mode, fops)	_alloc_file((mode), (fops))
116
117#define	file	linux_file
118#define	fget	linux_fget
119
120#endif	/* _LINUX_FILE_H_ */
121