FreeBSD/Linux Kernel Cross Reference
sys/sys/file.h
1 /*-
2 * Copyright (c) 1982, 1986, 1989, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 4. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * @(#)file.h 8.3 (Berkeley) 1/9/95
30 * $FreeBSD: releng/9.1/sys/sys/file.h 238560 2012-07-18 04:52:37Z mjg $
31 */
32
33 #ifndef _SYS_FILE_H_
34 #define _SYS_FILE_H_
35
36 #ifndef _KERNEL
37 #include <sys/types.h> /* XXX */
38 #include <sys/fcntl.h>
39 #include <sys/unistd.h>
40 #else
41 #include <sys/queue.h>
42 #include <sys/refcount.h>
43 #include <sys/_lock.h>
44 #include <sys/_mutex.h>
45
46 struct stat;
47 struct thread;
48 struct uio;
49 struct knote;
50 struct vnode;
51 struct socket;
52
53
54 #endif /* _KERNEL */
55
56 #define DTYPE_VNODE 1 /* file */
57 #define DTYPE_SOCKET 2 /* communications endpoint */
58 #define DTYPE_PIPE 3 /* pipe */
59 #define DTYPE_FIFO 4 /* fifo (named pipe) */
60 #define DTYPE_KQUEUE 5 /* event queue */
61 #define DTYPE_CRYPTO 6 /* crypto */
62 #define DTYPE_MQUEUE 7 /* posix message queue */
63 #define DTYPE_SHM 8 /* swap-backed shared memory */
64 #define DTYPE_SEM 9 /* posix semaphore */
65 #define DTYPE_PTS 10 /* pseudo teletype master device */
66 #define DTYPE_DEV 11 /* Device specific fd type */
67 #define DTYPE_CAPABILITY 12 /* capability */
68 #define DTYPE_PROCDESC 13 /* process descriptor */
69
70 #ifdef _KERNEL
71
72 struct file;
73 struct ucred;
74
75 typedef int fo_rdwr_t(struct file *fp, struct uio *uio,
76 struct ucred *active_cred, int flags,
77 struct thread *td);
78 #define FOF_OFFSET 1 /* Use the offset in uio argument */
79 typedef int fo_truncate_t(struct file *fp, off_t length,
80 struct ucred *active_cred, struct thread *td);
81 typedef int fo_ioctl_t(struct file *fp, u_long com, void *data,
82 struct ucred *active_cred, struct thread *td);
83 typedef int fo_poll_t(struct file *fp, int events,
84 struct ucred *active_cred, struct thread *td);
85 typedef int fo_kqfilter_t(struct file *fp, struct knote *kn);
86 typedef int fo_stat_t(struct file *fp, struct stat *sb,
87 struct ucred *active_cred, struct thread *td);
88 typedef int fo_close_t(struct file *fp, struct thread *td);
89 typedef int fo_chmod_t(struct file *fp, mode_t mode,
90 struct ucred *active_cred, struct thread *td);
91 typedef int fo_chown_t(struct file *fp, uid_t uid, gid_t gid,
92 struct ucred *active_cred, struct thread *td);
93 typedef int fo_flags_t;
94
95 struct fileops {
96 fo_rdwr_t *fo_read;
97 fo_rdwr_t *fo_write;
98 fo_truncate_t *fo_truncate;
99 fo_ioctl_t *fo_ioctl;
100 fo_poll_t *fo_poll;
101 fo_kqfilter_t *fo_kqfilter;
102 fo_stat_t *fo_stat;
103 fo_close_t *fo_close;
104 fo_chmod_t *fo_chmod;
105 fo_chown_t *fo_chown;
106 fo_flags_t fo_flags; /* DFLAG_* below */
107 };
108
109 #define DFLAG_PASSABLE 0x01 /* may be passed via unix sockets. */
110 #define DFLAG_SEEKABLE 0x02 /* seekable / nonsequential */
111 #endif /* _KERNEL */
112
113 #if defined(_KERNEL) || defined(_WANT_FILE)
114 /*
115 * Kernel descriptor table.
116 * One entry for each open kernel vnode and socket.
117 *
118 * Below is the list of locks that protects members in struct file.
119 *
120 * (f) protected with mtx_lock(mtx_pool_find(fp))
121 * (d) cdevpriv_mtx
122 * none not locked
123 */
124
125 struct fadvise_info {
126 int fa_advice; /* (f) FADV_* type. */
127 off_t fa_start; /* (f) Region start. */
128 off_t fa_end; /* (f) Region end. */
129 };
130
131 struct file {
132 void *f_data; /* file descriptor specific data */
133 struct fileops *f_ops; /* File operations */
134 struct ucred *f_cred; /* associated credentials. */
135 struct vnode *f_vnode; /* NULL or applicable vnode */
136 short f_type; /* descriptor type */
137 short f_vnread_flags; /* (f) Sleep lock for f_offset */
138 volatile u_int f_flag; /* see fcntl.h */
139 volatile u_int f_count; /* reference count */
140 /*
141 * DTYPE_VNODE specific fields.
142 */
143 int f_seqcount; /* Count of sequential accesses. */
144 off_t f_nextoff; /* next expected read/write offset. */
145 union {
146 struct cdev_privdata *fvn_cdevpriv;
147 /* (d) Private data for the cdev. */
148 struct fadvise_info *fvn_advice;
149 } f_vnun;
150 /*
151 * DFLAG_SEEKABLE specific fields
152 */
153 off_t f_offset;
154 /*
155 * Mandatory Access control information.
156 */
157 void *f_label; /* Place-holder for MAC label. */
158 };
159
160 #define f_cdevpriv f_vnun.fvn_cdevpriv
161 #define f_advice f_vnun.fvn_advice
162
163 #define FOFFSET_LOCKED 0x1
164 #define FOFFSET_LOCK_WAITING 0x2
165
166 #endif /* _KERNEL || _WANT_FILE */
167
168 /*
169 * Userland version of struct file, for sysctl
170 */
171 struct xfile {
172 size_t xf_size; /* size of struct xfile */
173 pid_t xf_pid; /* owning process */
174 uid_t xf_uid; /* effective uid of owning process */
175 int xf_fd; /* descriptor number */
176 void *xf_file; /* address of struct file */
177 short xf_type; /* descriptor type */
178 int xf_count; /* reference count */
179 int xf_msgcount; /* references from message queue */
180 off_t xf_offset; /* file offset */
181 void *xf_data; /* file descriptor specific data */
182 void *xf_vnode; /* vnode pointer */
183 u_int xf_flag; /* flags (see fcntl.h) */
184 };
185
186 #ifdef _KERNEL
187
188 #ifdef MALLOC_DECLARE
189 MALLOC_DECLARE(M_FILE);
190 #endif
191
192 extern struct fileops vnops;
193 extern struct fileops badfileops;
194 extern struct fileops socketops;
195 extern int maxfiles; /* kernel limit on number of open files */
196 extern int maxfilesperproc; /* per process limit on number of open files */
197 extern volatile int openfiles; /* actual number of open files */
198
199 int fget(struct thread *td, int fd, cap_rights_t rights, struct file **fpp);
200 int fget_mmap(struct thread *td, int fd, cap_rights_t rights,
201 u_char *maxprotp, struct file **fpp);
202 int fget_read(struct thread *td, int fd, cap_rights_t rights,
203 struct file **fpp);
204 int fget_write(struct thread *td, int fd, cap_rights_t rights,
205 struct file **fpp);
206 int fgetcap(struct thread *td, int fd, struct file **fpp);
207 int _fdrop(struct file *fp, struct thread *td);
208
209 /*
210 * The socket operations are used a couple of places.
211 * XXX: This is wrong, they should go through the operations vector for
212 * XXX: sockets instead of going directly for the individual functions. /phk
213 */
214 fo_rdwr_t soo_read;
215 fo_rdwr_t soo_write;
216 fo_truncate_t soo_truncate;
217 fo_ioctl_t soo_ioctl;
218 fo_poll_t soo_poll;
219 fo_kqfilter_t soo_kqfilter;
220 fo_stat_t soo_stat;
221 fo_close_t soo_close;
222
223 fo_chmod_t invfo_chmod;
224 fo_chown_t invfo_chown;
225
226 void finit(struct file *, u_int, short, void *, struct fileops *);
227 int fgetvp(struct thread *td, int fd, cap_rights_t rights, struct vnode **vpp);
228 int fgetvp_exec(struct thread *td, int fd, cap_rights_t rights,
229 struct vnode **vpp);
230 int fgetvp_rights(struct thread *td, int fd, cap_rights_t need,
231 cap_rights_t *have, struct vnode **vpp);
232 int fgetvp_read(struct thread *td, int fd, cap_rights_t rights,
233 struct vnode **vpp);
234 int fgetvp_write(struct thread *td, int fd, cap_rights_t rights,
235 struct vnode **vpp);
236
237 int fgetsock(struct thread *td, int fd, cap_rights_t rights,
238 struct socket **spp, u_int *fflagp);
239 void fputsock(struct socket *sp);
240
241 static __inline int
242 _fnoop(void)
243 {
244
245 return (0);
246 }
247
248 #define fhold(fp) \
249 (refcount_acquire(&(fp)->f_count))
250 #define fdrop(fp, td) \
251 (refcount_release(&(fp)->f_count) ? _fdrop((fp), (td)) : _fnoop())
252
253 static __inline fo_rdwr_t fo_read;
254 static __inline fo_rdwr_t fo_write;
255 static __inline fo_truncate_t fo_truncate;
256 static __inline fo_ioctl_t fo_ioctl;
257 static __inline fo_poll_t fo_poll;
258 static __inline fo_kqfilter_t fo_kqfilter;
259 static __inline fo_stat_t fo_stat;
260 static __inline fo_close_t fo_close;
261 static __inline fo_chmod_t fo_chmod;
262 static __inline fo_chown_t fo_chown;
263
264 static __inline int
265 fo_read(struct file *fp, struct uio *uio, struct ucred *active_cred,
266 int flags, struct thread *td)
267 {
268
269 return ((*fp->f_ops->fo_read)(fp, uio, active_cred, flags, td));
270 }
271
272 static __inline int
273 fo_write(struct file *fp, struct uio *uio, struct ucred *active_cred,
274 int flags, struct thread *td)
275 {
276
277 return ((*fp->f_ops->fo_write)(fp, uio, active_cred, flags, td));
278 }
279
280 static __inline int
281 fo_truncate(struct file *fp, off_t length, struct ucred *active_cred,
282 struct thread *td)
283 {
284
285 return ((*fp->f_ops->fo_truncate)(fp, length, active_cred, td));
286 }
287
288 static __inline int
289 fo_ioctl(struct file *fp, u_long com, void *data, struct ucred *active_cred,
290 struct thread *td)
291 {
292
293 return ((*fp->f_ops->fo_ioctl)(fp, com, data, active_cred, td));
294 }
295
296 static __inline int
297 fo_poll(struct file *fp, int events, struct ucred *active_cred,
298 struct thread *td)
299 {
300
301 return ((*fp->f_ops->fo_poll)(fp, events, active_cred, td));
302 }
303
304 static __inline int
305 fo_stat(struct file *fp, struct stat *sb, struct ucred *active_cred,
306 struct thread *td)
307 {
308
309 return ((*fp->f_ops->fo_stat)(fp, sb, active_cred, td));
310 }
311
312 static __inline int
313 fo_close(struct file *fp, struct thread *td)
314 {
315
316 return ((*fp->f_ops->fo_close)(fp, td));
317 }
318
319 static __inline int
320 fo_kqfilter(struct file *fp, struct knote *kn)
321 {
322
323 return ((*fp->f_ops->fo_kqfilter)(fp, kn));
324 }
325
326 static __inline int
327 fo_chmod(struct file *fp, mode_t mode, struct ucred *active_cred,
328 struct thread *td)
329 {
330
331 return ((*fp->f_ops->fo_chmod)(fp, mode, active_cred, td));
332 }
333
334 static __inline int
335 fo_chown(struct file *fp, uid_t uid, gid_t gid, struct ucred *active_cred,
336 struct thread *td)
337 {
338
339 return ((*fp->f_ops->fo_chown)(fp, uid, gid, active_cred, td));
340 }
341
342 #endif /* _KERNEL */
343
344 #endif /* !SYS_FILE_H */
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