1 /*-
2 * Copyright (c) 2010 Isilon Systems, Inc.
3 * Copyright (c) 2010 iX Systems, Inc.
4 * Copyright (c) 2010 Panasas, Inc.
5 * Copyright (c) 2013-2015 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 * $FreeBSD$
30 */
31 #ifndef _LINUX_FILE_H_
32 #define _LINUX_FILE_H_
33
34 #include <sys/param.h>
35 #include <sys/file.h>
36 #include <sys/filedesc.h>
37 #include <sys/refcount.h>
38 #include <sys/capsicum.h>
39 #include <sys/proc.h>
40
41 #include <linux/fs.h>
42
43 struct linux_file;
44
45 #undef file
46
47 extern struct fileops linuxfileops;
48
49 static inline struct linux_file *
linux_fget(unsigned int fd)50 linux_fget(unsigned int fd)
51 {
52 cap_rights_t rights;
53 struct file *file;
54
55 if (fget_unlocked(curthread->td_proc->p_fd, fd,
56 cap_rights_init(&rights), &file, NULL) != 0) {
57 return (NULL);
58 }
59 return (struct linux_file *)file->f_data;
60 }
61
62 static inline void
fput(struct linux_file * filp)63 fput(struct linux_file *filp)
64 {
65 if (filp->_file == NULL) {
66 kfree(filp);
67 return;
68 }
69 if (refcount_release(&filp->_file->f_count)) {
70 _fdrop(filp->_file, curthread);
71 kfree(filp);
72 }
73 }
74
75 static inline void
put_unused_fd(unsigned int fd)76 put_unused_fd(unsigned int fd)
77 {
78 cap_rights_t rights;
79 struct file *file;
80
81 if (fget_unlocked(curthread->td_proc->p_fd, fd,
82 cap_rights_init(&rights), &file, NULL) != 0) {
83 return;
84 }
85 /*
86 * NOTE: We should only get here when the "fd" has not been
87 * installed, so no need to free the associated Linux file
88 * structure.
89 */
90 fdclose(curthread, file, fd);
91
92 /* drop extra reference */
93 fdrop(file, curthread);
94 }
95
96 static inline void
fd_install(unsigned int fd,struct linux_file * filp)97 fd_install(unsigned int fd, struct linux_file *filp)
98 {
99 cap_rights_t rights;
100 struct file *file;
101
102 if (fget_unlocked(curthread->td_proc->p_fd, fd,
103 cap_rights_init(&rights), &file, NULL) != 0) {
104 filp->_file = NULL;
105 } else {
106 filp->_file = file;
107 finit(file, filp->f_mode, DTYPE_DEV, filp, &linuxfileops);
108 }
109
110 /* drop the extra reference */
111 fput(filp);
112 }
113
114 static inline int
get_unused_fd(void)115 get_unused_fd(void)
116 {
117 struct file *file;
118 int error;
119 int fd;
120
121 error = falloc(curthread, &file, &fd, 0);
122 if (error)
123 return -error;
124 /* drop the extra reference */
125 fdrop(file, curthread);
126 return fd;
127 }
128
129 static inline int
get_unused_fd_flags(int flags)130 get_unused_fd_flags(int flags)
131 {
132 struct file *file;
133 int error;
134 int fd;
135
136 error = falloc(curthread, &file, &fd, flags);
137 if (error)
138 return -error;
139 /* drop the extra reference */
140 fdrop(file, curthread);
141 return fd;
142 }
143
144 static inline struct linux_file *
alloc_file(int mode,const struct file_operations * fops)145 alloc_file(int mode, const struct file_operations *fops)
146 {
147 struct linux_file *filp;
148
149 filp = kzalloc(sizeof(*filp), GFP_KERNEL);
150 if (filp == NULL)
151 return (NULL);
152 filp->f_op = fops;
153 filp->f_mode = mode;
154
155 return filp;
156 }
157
158 struct fd {
159 struct linux_file *linux_file;
160 };
161
fdput(struct fd fd)162 static inline void fdput(struct fd fd)
163 {
164 fput(fd.linux_file);
165 }
166
fdget(unsigned int fd)167 static inline struct fd fdget(unsigned int fd)
168 {
169 struct linux_file *f = linux_fget(fd);
170 return (struct fd){f};
171 }
172
173 #define file linux_file
174 #define fget linux_fget
175
176 #endif /* _LINUX_FILE_H_ */
177