FreeBSD/Linux Kernel Cross Reference
sys/sys/file.h
1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1982, 1986, 1989, 1993
5 * The Regents of the University of California. 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, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 *
31 * @(#)file.h 8.3 (Berkeley) 1/9/95
32 * $FreeBSD: releng/12.0/sys/sys/file.h 335979 2018-07-05 13:13:48Z brooks $
33 */
34
35 #ifndef _SYS_FILE_H_
36 #define _SYS_FILE_H_
37
38 #ifndef _KERNEL
39 #include <sys/types.h> /* XXX */
40 #include <sys/fcntl.h>
41 #include <sys/unistd.h>
42 #else
43 #include <sys/queue.h>
44 #include <sys/refcount.h>
45 #include <sys/_lock.h>
46 #include <sys/_mutex.h>
47 #include <vm/vm.h>
48
49 struct filedesc;
50 struct stat;
51 struct thread;
52 struct uio;
53 struct knote;
54 struct vnode;
55
56 #endif /* _KERNEL */
57
58 #define DTYPE_NONE 0 /* not yet initialized */
59 #define DTYPE_VNODE 1 /* file */
60 #define DTYPE_SOCKET 2 /* communications endpoint */
61 #define DTYPE_PIPE 3 /* pipe */
62 #define DTYPE_FIFO 4 /* fifo (named pipe) */
63 #define DTYPE_KQUEUE 5 /* event queue */
64 #define DTYPE_CRYPTO 6 /* crypto */
65 #define DTYPE_MQUEUE 7 /* posix message queue */
66 #define DTYPE_SHM 8 /* swap-backed shared memory */
67 #define DTYPE_SEM 9 /* posix semaphore */
68 #define DTYPE_PTS 10 /* pseudo teletype master device */
69 #define DTYPE_DEV 11 /* Device specific fd type */
70 #define DTYPE_PROCDESC 12 /* process descriptor */
71 #define DTYPE_LINUXEFD 13 /* emulation eventfd type */
72 #define DTYPE_LINUXTFD 14 /* emulation timerfd type */
73
74 #ifdef _KERNEL
75
76 struct file;
77 struct filecaps;
78 struct kaiocb;
79 struct kinfo_file;
80 struct ucred;
81
82 #define FOF_OFFSET 0x01 /* Use the offset in uio argument */
83 #define FOF_NOLOCK 0x02 /* Do not take FOFFSET_LOCK */
84 #define FOF_NEXTOFF 0x04 /* Also update f_nextoff */
85 #define FOF_NOUPDATE 0x10 /* Do not update f_offset */
86 off_t foffset_lock(struct file *fp, int flags);
87 void foffset_lock_uio(struct file *fp, struct uio *uio, int flags);
88 void foffset_unlock(struct file *fp, off_t val, int flags);
89 void foffset_unlock_uio(struct file *fp, struct uio *uio, int flags);
90
91 static inline off_t
92 foffset_get(struct file *fp)
93 {
94
95 return (foffset_lock(fp, FOF_NOLOCK));
96 }
97
98 typedef int fo_rdwr_t(struct file *fp, struct uio *uio,
99 struct ucred *active_cred, int flags,
100 struct thread *td);
101 typedef int fo_truncate_t(struct file *fp, off_t length,
102 struct ucred *active_cred, struct thread *td);
103 typedef int fo_ioctl_t(struct file *fp, u_long com, void *data,
104 struct ucred *active_cred, struct thread *td);
105 typedef int fo_poll_t(struct file *fp, int events,
106 struct ucred *active_cred, struct thread *td);
107 typedef int fo_kqfilter_t(struct file *fp, struct knote *kn);
108 typedef int fo_stat_t(struct file *fp, struct stat *sb,
109 struct ucred *active_cred, struct thread *td);
110 typedef int fo_close_t(struct file *fp, struct thread *td);
111 typedef int fo_chmod_t(struct file *fp, mode_t mode,
112 struct ucred *active_cred, struct thread *td);
113 typedef int fo_chown_t(struct file *fp, uid_t uid, gid_t gid,
114 struct ucred *active_cred, struct thread *td);
115 typedef int fo_sendfile_t(struct file *fp, int sockfd, struct uio *hdr_uio,
116 struct uio *trl_uio, off_t offset, size_t nbytes,
117 off_t *sent, int flags, struct thread *td);
118 typedef int fo_seek_t(struct file *fp, off_t offset, int whence,
119 struct thread *td);
120 typedef int fo_fill_kinfo_t(struct file *fp, struct kinfo_file *kif,
121 struct filedesc *fdp);
122 typedef int fo_mmap_t(struct file *fp, vm_map_t map, vm_offset_t *addr,
123 vm_size_t size, vm_prot_t prot, vm_prot_t cap_maxprot,
124 int flags, vm_ooffset_t foff, struct thread *td);
125 typedef int fo_aio_queue_t(struct file *fp, struct kaiocb *job);
126 typedef int fo_flags_t;
127
128 struct fileops {
129 fo_rdwr_t *fo_read;
130 fo_rdwr_t *fo_write;
131 fo_truncate_t *fo_truncate;
132 fo_ioctl_t *fo_ioctl;
133 fo_poll_t *fo_poll;
134 fo_kqfilter_t *fo_kqfilter;
135 fo_stat_t *fo_stat;
136 fo_close_t *fo_close;
137 fo_chmod_t *fo_chmod;
138 fo_chown_t *fo_chown;
139 fo_sendfile_t *fo_sendfile;
140 fo_seek_t *fo_seek;
141 fo_fill_kinfo_t *fo_fill_kinfo;
142 fo_mmap_t *fo_mmap;
143 fo_aio_queue_t *fo_aio_queue;
144 fo_flags_t fo_flags; /* DFLAG_* below */
145 };
146
147 #define DFLAG_PASSABLE 0x01 /* may be passed via unix sockets. */
148 #define DFLAG_SEEKABLE 0x02 /* seekable / nonsequential */
149 #endif /* _KERNEL */
150
151 #if defined(_KERNEL) || defined(_WANT_FILE)
152 /*
153 * Kernel descriptor table.
154 * One entry for each open kernel vnode and socket.
155 *
156 * Below is the list of locks that protects members in struct file.
157 *
158 * (a) f_vnode lock required (shared allows both reads and writes)
159 * (f) protected with mtx_lock(mtx_pool_find(fp))
160 * (d) cdevpriv_mtx
161 * none not locked
162 */
163
164 struct fadvise_info {
165 int fa_advice; /* (f) FADV_* type. */
166 off_t fa_start; /* (f) Region start. */
167 off_t fa_end; /* (f) Region end. */
168 };
169
170 struct file {
171 void *f_data; /* file descriptor specific data */
172 struct fileops *f_ops; /* File operations */
173 struct ucred *f_cred; /* associated credentials. */
174 struct vnode *f_vnode; /* NULL or applicable vnode */
175 short f_type; /* descriptor type */
176 short f_vnread_flags; /* (f) Sleep lock for f_offset */
177 volatile u_int f_flag; /* see fcntl.h */
178 volatile u_int f_count; /* reference count */
179 /*
180 * DTYPE_VNODE specific fields.
181 */
182 int f_seqcount; /* (a) Count of sequential accesses. */
183 off_t f_nextoff; /* next expected read/write offset. */
184 union {
185 struct cdev_privdata *fvn_cdevpriv;
186 /* (d) Private data for the cdev. */
187 struct fadvise_info *fvn_advice;
188 } f_vnun;
189 /*
190 * DFLAG_SEEKABLE specific fields
191 */
192 off_t f_offset;
193 /*
194 * Mandatory Access control information.
195 */
196 void *f_label; /* Place-holder for MAC label. */
197 };
198
199 #define f_cdevpriv f_vnun.fvn_cdevpriv
200 #define f_advice f_vnun.fvn_advice
201
202 #define FOFFSET_LOCKED 0x1
203 #define FOFFSET_LOCK_WAITING 0x2
204 #define FDEVFS_VNODE 0x4
205
206 #endif /* _KERNEL || _WANT_FILE */
207
208 /*
209 * Userland version of struct file, for sysctl
210 */
211 struct xfile {
212 ksize_t xf_size; /* size of struct xfile */
213 pid_t xf_pid; /* owning process */
214 uid_t xf_uid; /* effective uid of owning process */
215 int xf_fd; /* descriptor number */
216 int _xf_int_pad1;
217 kvaddr_t xf_file; /* address of struct file */
218 short xf_type; /* descriptor type */
219 short _xf_short_pad1;
220 int xf_count; /* reference count */
221 int xf_msgcount; /* references from message queue */
222 int _xf_int_pad2;
223 off_t xf_offset; /* file offset */
224 kvaddr_t xf_data; /* file descriptor specific data */
225 kvaddr_t xf_vnode; /* vnode pointer */
226 u_int xf_flag; /* flags (see fcntl.h) */
227 int _xf_int_pad3;
228 int64_t _xf_int64_pad[6];
229 };
230
231 #ifdef _KERNEL
232
233 extern struct fileops vnops;
234 extern struct fileops badfileops;
235 extern struct fileops socketops;
236 extern int maxfiles; /* kernel limit on number of open files */
237 extern int maxfilesperproc; /* per process limit on number of open files */
238 extern volatile int openfiles; /* actual number of open files */
239
240 int fget(struct thread *td, int fd, cap_rights_t *rightsp, struct file **fpp);
241 int fget_mmap(struct thread *td, int fd, cap_rights_t *rightsp,
242 u_char *maxprotp, struct file **fpp);
243 int fget_read(struct thread *td, int fd, cap_rights_t *rightsp,
244 struct file **fpp);
245 int fget_write(struct thread *td, int fd, cap_rights_t *rightsp,
246 struct file **fpp);
247 int fget_fcntl(struct thread *td, int fd, cap_rights_t *rightsp,
248 int needfcntl, struct file **fpp);
249 int _fdrop(struct file *fp, struct thread *td);
250
251 fo_rdwr_t invfo_rdwr;
252 fo_truncate_t invfo_truncate;
253 fo_ioctl_t invfo_ioctl;
254 fo_poll_t invfo_poll;
255 fo_kqfilter_t invfo_kqfilter;
256 fo_chmod_t invfo_chmod;
257 fo_chown_t invfo_chown;
258 fo_sendfile_t invfo_sendfile;
259
260 fo_sendfile_t vn_sendfile;
261 fo_seek_t vn_seek;
262 fo_fill_kinfo_t vn_fill_kinfo;
263 int vn_fill_kinfo_vnode(struct vnode *vp, struct kinfo_file *kif);
264
265 void finit(struct file *, u_int, short, void *, struct fileops *);
266 int fgetvp(struct thread *td, int fd, cap_rights_t *rightsp,
267 struct vnode **vpp);
268 int fgetvp_exec(struct thread *td, int fd, cap_rights_t *rightsp,
269 struct vnode **vpp);
270 int fgetvp_rights(struct thread *td, int fd, cap_rights_t *needrightsp,
271 struct filecaps *havecaps, struct vnode **vpp);
272 int fgetvp_read(struct thread *td, int fd, cap_rights_t *rightsp,
273 struct vnode **vpp);
274 int fgetvp_write(struct thread *td, int fd, cap_rights_t *rightsp,
275 struct vnode **vpp);
276
277 static __inline int
278 _fnoop(void)
279 {
280
281 return (0);
282 }
283
284 #define fhold(fp) \
285 (refcount_acquire(&(fp)->f_count))
286 #define fdrop(fp, td) \
287 (refcount_release(&(fp)->f_count) ? _fdrop((fp), (td)) : _fnoop())
288
289 static __inline fo_rdwr_t fo_read;
290 static __inline fo_rdwr_t fo_write;
291 static __inline fo_truncate_t fo_truncate;
292 static __inline fo_ioctl_t fo_ioctl;
293 static __inline fo_poll_t fo_poll;
294 static __inline fo_kqfilter_t fo_kqfilter;
295 static __inline fo_stat_t fo_stat;
296 static __inline fo_close_t fo_close;
297 static __inline fo_chmod_t fo_chmod;
298 static __inline fo_chown_t fo_chown;
299 static __inline fo_sendfile_t fo_sendfile;
300
301 static __inline int
302 fo_read(struct file *fp, struct uio *uio, struct ucred *active_cred,
303 int flags, struct thread *td)
304 {
305
306 return ((*fp->f_ops->fo_read)(fp, uio, active_cred, flags, td));
307 }
308
309 static __inline int
310 fo_write(struct file *fp, struct uio *uio, struct ucred *active_cred,
311 int flags, struct thread *td)
312 {
313
314 return ((*fp->f_ops->fo_write)(fp, uio, active_cred, flags, td));
315 }
316
317 static __inline int
318 fo_truncate(struct file *fp, off_t length, struct ucred *active_cred,
319 struct thread *td)
320 {
321
322 return ((*fp->f_ops->fo_truncate)(fp, length, active_cred, td));
323 }
324
325 static __inline int
326 fo_ioctl(struct file *fp, u_long com, void *data, struct ucred *active_cred,
327 struct thread *td)
328 {
329
330 return ((*fp->f_ops->fo_ioctl)(fp, com, data, active_cred, td));
331 }
332
333 static __inline int
334 fo_poll(struct file *fp, int events, struct ucred *active_cred,
335 struct thread *td)
336 {
337
338 return ((*fp->f_ops->fo_poll)(fp, events, active_cred, td));
339 }
340
341 static __inline int
342 fo_stat(struct file *fp, struct stat *sb, struct ucred *active_cred,
343 struct thread *td)
344 {
345
346 return ((*fp->f_ops->fo_stat)(fp, sb, active_cred, td));
347 }
348
349 static __inline int
350 fo_close(struct file *fp, struct thread *td)
351 {
352
353 return ((*fp->f_ops->fo_close)(fp, td));
354 }
355
356 static __inline int
357 fo_kqfilter(struct file *fp, struct knote *kn)
358 {
359
360 return ((*fp->f_ops->fo_kqfilter)(fp, kn));
361 }
362
363 static __inline int
364 fo_chmod(struct file *fp, mode_t mode, struct ucred *active_cred,
365 struct thread *td)
366 {
367
368 return ((*fp->f_ops->fo_chmod)(fp, mode, active_cred, td));
369 }
370
371 static __inline int
372 fo_chown(struct file *fp, uid_t uid, gid_t gid, struct ucred *active_cred,
373 struct thread *td)
374 {
375
376 return ((*fp->f_ops->fo_chown)(fp, uid, gid, active_cred, td));
377 }
378
379 static __inline int
380 fo_sendfile(struct file *fp, int sockfd, struct uio *hdr_uio,
381 struct uio *trl_uio, off_t offset, size_t nbytes, off_t *sent, int flags,
382 struct thread *td)
383 {
384
385 return ((*fp->f_ops->fo_sendfile)(fp, sockfd, hdr_uio, trl_uio, offset,
386 nbytes, sent, flags, td));
387 }
388
389 static __inline int
390 fo_seek(struct file *fp, off_t offset, int whence, struct thread *td)
391 {
392
393 return ((*fp->f_ops->fo_seek)(fp, offset, whence, td));
394 }
395
396 static __inline int
397 fo_fill_kinfo(struct file *fp, struct kinfo_file *kif, struct filedesc *fdp)
398 {
399
400 return ((*fp->f_ops->fo_fill_kinfo)(fp, kif, fdp));
401 }
402
403 static __inline int
404 fo_mmap(struct file *fp, vm_map_t map, vm_offset_t *addr, vm_size_t size,
405 vm_prot_t prot, vm_prot_t cap_maxprot, int flags, vm_ooffset_t foff,
406 struct thread *td)
407 {
408
409 if (fp->f_ops->fo_mmap == NULL)
410 return (ENODEV);
411 return ((*fp->f_ops->fo_mmap)(fp, map, addr, size, prot, cap_maxprot,
412 flags, foff, td));
413 }
414
415 static __inline int
416 fo_aio_queue(struct file *fp, struct kaiocb *job)
417 {
418
419 return ((*fp->f_ops->fo_aio_queue)(fp, job));
420 }
421
422 #endif /* _KERNEL */
423
424 #endif /* !SYS_FILE_H */
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