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 * $FreeBSD$
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 struct nameidata;
56
57 #endif /* _KERNEL */
58
59 #define DTYPE_NONE 0 /* not yet initialized */
60 #define DTYPE_VNODE 1 /* file */
61 #define DTYPE_SOCKET 2 /* communications endpoint */
62 #define DTYPE_PIPE 3 /* pipe */
63 #define DTYPE_FIFO 4 /* fifo (named pipe) */
64 #define DTYPE_KQUEUE 5 /* event queue */
65 #define DTYPE_CRYPTO 6 /* crypto */
66 #define DTYPE_MQUEUE 7 /* posix message queue */
67 #define DTYPE_SHM 8 /* swap-backed shared memory */
68 #define DTYPE_SEM 9 /* posix semaphore */
69 #define DTYPE_PTS 10 /* pseudo teletype master device */
70 #define DTYPE_DEV 11 /* Device specific fd type */
71 #define DTYPE_PROCDESC 12 /* process descriptor */
72 #define DTYPE_EVENTFD 13 /* eventfd */
73 #define DTYPE_LINUXTFD 14 /* emulation timerfd type */
74
75 #ifdef _KERNEL
76
77 struct file;
78 struct filecaps;
79 struct kaiocb;
80 struct kinfo_file;
81 struct ucred;
82
83 #define FOF_OFFSET 0x01 /* Use the offset in uio argument */
84 #define FOF_NOLOCK 0x02 /* Do not take FOFFSET_LOCK */
85 #define FOF_NEXTOFF_R 0x04 /* Also update f_nextoff[UIO_READ] */
86 #define FOF_NEXTOFF_W 0x08 /* Also update f_nextoff[UIO_WRITE] */
87 #define FOF_NOUPDATE 0x10 /* Do not update f_offset */
88 off_t foffset_lock(struct file *fp, int flags);
89 void foffset_lock_uio(struct file *fp, struct uio *uio, int flags);
90 void foffset_unlock(struct file *fp, off_t val, int flags);
91 void foffset_unlock_uio(struct file *fp, struct uio *uio, int flags);
92
93 static inline off_t
94 foffset_get(struct file *fp)
95 {
96
97 return (foffset_lock(fp, FOF_NOLOCK));
98 }
99
100 typedef int fo_rdwr_t(struct file *fp, struct uio *uio,
101 struct ucred *active_cred, int flags,
102 struct thread *td);
103 typedef int fo_truncate_t(struct file *fp, off_t length,
104 struct ucred *active_cred, struct thread *td);
105 typedef int fo_ioctl_t(struct file *fp, u_long com, void *data,
106 struct ucred *active_cred, struct thread *td);
107 typedef int fo_poll_t(struct file *fp, int events,
108 struct ucred *active_cred, struct thread *td);
109 typedef int fo_kqfilter_t(struct file *fp, struct knote *kn);
110 typedef int fo_stat_t(struct file *fp, struct stat *sb,
111 struct ucred *active_cred);
112 typedef int fo_close_t(struct file *fp, struct thread *td);
113 typedef int fo_chmod_t(struct file *fp, mode_t mode,
114 struct ucred *active_cred, struct thread *td);
115 typedef int fo_chown_t(struct file *fp, uid_t uid, gid_t gid,
116 struct ucred *active_cred, struct thread *td);
117 typedef int fo_sendfile_t(struct file *fp, int sockfd, struct uio *hdr_uio,
118 struct uio *trl_uio, off_t offset, size_t nbytes,
119 off_t *sent, int flags, struct thread *td);
120 typedef int fo_seek_t(struct file *fp, off_t offset, int whence,
121 struct thread *td);
122 typedef int fo_fill_kinfo_t(struct file *fp, struct kinfo_file *kif,
123 struct filedesc *fdp);
124 typedef int fo_mmap_t(struct file *fp, vm_map_t map, vm_offset_t *addr,
125 vm_size_t size, vm_prot_t prot, vm_prot_t cap_maxprot,
126 int flags, vm_ooffset_t foff, struct thread *td);
127 typedef int fo_aio_queue_t(struct file *fp, struct kaiocb *job);
128 typedef int fo_add_seals_t(struct file *fp, int flags);
129 typedef int fo_get_seals_t(struct file *fp, int *flags);
130 typedef int fo_fallocate_t(struct file *fp, off_t offset, off_t len,
131 struct thread *td);
132 typedef int fo_fspacectl_t(struct file *fp, int cmd,
133 off_t *offset, off_t *length, int flags,
134 struct ucred *active_cred, struct thread *td);
135 typedef int fo_spare_t(struct file *fp);
136 typedef int fo_flags_t;
137
138 struct fileops {
139 fo_rdwr_t *fo_read;
140 fo_rdwr_t *fo_write;
141 fo_truncate_t *fo_truncate;
142 fo_ioctl_t *fo_ioctl;
143 fo_poll_t *fo_poll;
144 fo_kqfilter_t *fo_kqfilter;
145 fo_stat_t *fo_stat;
146 fo_close_t *fo_close;
147 fo_chmod_t *fo_chmod;
148 fo_chown_t *fo_chown;
149 fo_sendfile_t *fo_sendfile;
150 fo_seek_t *fo_seek;
151 fo_fill_kinfo_t *fo_fill_kinfo;
152 fo_mmap_t *fo_mmap;
153 fo_aio_queue_t *fo_aio_queue;
154 fo_add_seals_t *fo_add_seals;
155 fo_get_seals_t *fo_get_seals;
156 fo_fallocate_t *fo_fallocate;
157 fo_fspacectl_t *fo_fspacectl;
158 fo_spare_t *fo_spares[8]; /* Spare slots */
159 fo_flags_t fo_flags; /* DFLAG_* below */
160 };
161
162 #define DFLAG_PASSABLE 0x01 /* may be passed via unix sockets. */
163 #define DFLAG_SEEKABLE 0x02 /* seekable / nonsequential */
164 #endif /* _KERNEL */
165
166 #if defined(_KERNEL) || defined(_WANT_FILE)
167 /*
168 * Kernel descriptor table.
169 * One entry for each open kernel vnode and socket.
170 *
171 * Below is the list of locks that protects members in struct file.
172 *
173 * (a) f_vnode lock required (shared allows both reads and writes)
174 * (f) updated with atomics and blocking on sleepq
175 * (d) cdevpriv_mtx
176 * none not locked
177 */
178
179 #if __BSD_VISIBLE
180 struct fadvise_info {
181 int fa_advice; /* (f) FADV_* type. */
182 off_t fa_start; /* (f) Region start. */
183 off_t fa_end; /* (f) Region end. */
184 };
185
186 struct file {
187 volatile u_int f_flag; /* see fcntl.h */
188 volatile u_int f_count; /* reference count */
189 void *f_data; /* file descriptor specific data */
190 struct fileops *f_ops; /* File operations */
191 struct vnode *f_vnode; /* NULL or applicable vnode */
192 struct ucred *f_cred; /* associated credentials. */
193 short f_type; /* descriptor type */
194 short f_vnread_flags; /* (f) Sleep lock for f_offset */
195 /*
196 * DTYPE_VNODE specific fields.
197 */
198 union {
199 int16_t f_seqcount[2]; /* (a) Count of seq. reads and writes. */
200 int f_pipegen;
201 };
202 off_t f_nextoff[2]; /* next expected read/write offset. */
203 union {
204 struct cdev_privdata *fvn_cdevpriv;
205 /* (d) Private data for the cdev. */
206 struct fadvise_info *fvn_advice;
207 } f_vnun;
208 /*
209 * DFLAG_SEEKABLE specific fields
210 */
211 off_t f_offset;
212 };
213
214 #define f_cdevpriv f_vnun.fvn_cdevpriv
215 #define f_advice f_vnun.fvn_advice
216
217 #define FOFFSET_LOCKED 0x1
218 #define FOFFSET_LOCK_WAITING 0x2
219 #endif /* __BSD_VISIBLE */
220
221 #endif /* _KERNEL || _WANT_FILE */
222
223 /*
224 * Userland version of struct file, for sysctl
225 */
226 #if __BSD_VISIBLE
227 struct xfile {
228 ksize_t xf_size; /* size of struct xfile */
229 pid_t xf_pid; /* owning process */
230 uid_t xf_uid; /* effective uid of owning process */
231 int xf_fd; /* descriptor number */
232 int _xf_int_pad1;
233 kvaddr_t xf_file; /* address of struct file */
234 short xf_type; /* descriptor type */
235 short _xf_short_pad1;
236 int xf_count; /* reference count */
237 int xf_msgcount; /* references from message queue */
238 int _xf_int_pad2;
239 off_t xf_offset; /* file offset */
240 kvaddr_t xf_data; /* file descriptor specific data */
241 kvaddr_t xf_vnode; /* vnode pointer */
242 u_int xf_flag; /* flags (see fcntl.h) */
243 int _xf_int_pad3;
244 int64_t _xf_int64_pad[6];
245 };
246 #endif /* __BSD_VISIBLE */
247
248 #ifdef _KERNEL
249
250 extern struct fileops vnops;
251 extern struct fileops badfileops;
252 extern struct fileops path_fileops;
253 extern struct fileops socketops;
254 extern int maxfiles; /* kernel limit on number of open files */
255 extern int maxfilesperproc; /* per process limit on number of open files */
256
257 int fget(struct thread *td, int fd, cap_rights_t *rightsp, struct file **fpp);
258 int fget_mmap(struct thread *td, int fd, cap_rights_t *rightsp,
259 vm_prot_t *maxprotp, struct file **fpp);
260 int fget_read(struct thread *td, int fd, cap_rights_t *rightsp,
261 struct file **fpp);
262 int fget_write(struct thread *td, int fd, cap_rights_t *rightsp,
263 struct file **fpp);
264 int fget_fcntl(struct thread *td, int fd, cap_rights_t *rightsp,
265 int needfcntl, struct file **fpp);
266 int _fdrop(struct file *fp, struct thread *td);
267
268 fo_rdwr_t invfo_rdwr;
269 fo_truncate_t invfo_truncate;
270 fo_ioctl_t invfo_ioctl;
271 fo_poll_t invfo_poll;
272 fo_kqfilter_t invfo_kqfilter;
273 fo_chmod_t invfo_chmod;
274 fo_chown_t invfo_chown;
275 fo_sendfile_t invfo_sendfile;
276 fo_stat_t vn_statfile;
277 fo_sendfile_t vn_sendfile;
278 fo_seek_t vn_seek;
279 fo_fill_kinfo_t vn_fill_kinfo;
280 fo_kqfilter_t vn_kqfilter_opath;
281 int vn_fill_kinfo_vnode(struct vnode *vp, struct kinfo_file *kif);
282
283 void finit(struct file *, u_int, short, void *, struct fileops *);
284 void finit_vnode(struct file *, u_int, void *, struct fileops *);
285 int fgetvp(struct thread *td, int fd, cap_rights_t *rightsp,
286 struct vnode **vpp);
287 int fgetvp_exec(struct thread *td, int fd, cap_rights_t *rightsp,
288 struct vnode **vpp);
289 int fgetvp_rights(struct thread *td, int fd, cap_rights_t *needrightsp,
290 struct filecaps *havecaps, struct vnode **vpp);
291 int fgetvp_read(struct thread *td, int fd, cap_rights_t *rightsp,
292 struct vnode **vpp);
293 int fgetvp_write(struct thread *td, int fd, cap_rights_t *rightsp,
294 struct vnode **vpp);
295 int fgetvp_lookup_smr(int fd, struct nameidata *ndp, struct vnode **vpp, bool *fsearch);
296 int fgetvp_lookup(int fd, struct nameidata *ndp, struct vnode **vpp);
297
298 static __inline __result_use_check bool
299 fhold(struct file *fp)
300 {
301 return (refcount_acquire_checked(&fp->f_count));
302 }
303
304 #define fdrop(fp, td) ({ \
305 struct file *_fp; \
306 int _error; \
307 \
308 _error = 0; \
309 _fp = (fp); \
310 if (__predict_false(refcount_release(&_fp->f_count))) \
311 _error = _fdrop(_fp, td); \
312 _error; \
313 })
314
315 #define fdrop_close(fp, td) ({ \
316 struct file *_fp; \
317 int _error; \
318 \
319 _error = 0; \
320 _fp = (fp); \
321 if (__predict_true(refcount_release(&_fp->f_count))) \
322 _error = _fdrop(_fp, td); \
323 _error; \
324 })
325
326 static __inline fo_rdwr_t fo_read;
327 static __inline fo_rdwr_t fo_write;
328 static __inline fo_truncate_t fo_truncate;
329 static __inline fo_ioctl_t fo_ioctl;
330 static __inline fo_poll_t fo_poll;
331 static __inline fo_kqfilter_t fo_kqfilter;
332 static __inline fo_stat_t fo_stat;
333 static __inline fo_close_t fo_close;
334 static __inline fo_chmod_t fo_chmod;
335 static __inline fo_chown_t fo_chown;
336 static __inline fo_sendfile_t fo_sendfile;
337
338 static __inline int
339 fo_read(struct file *fp, struct uio *uio, struct ucred *active_cred,
340 int flags, struct thread *td)
341 {
342
343 return ((*fp->f_ops->fo_read)(fp, uio, active_cred, flags, td));
344 }
345
346 static __inline int
347 fo_write(struct file *fp, struct uio *uio, struct ucred *active_cred,
348 int flags, struct thread *td)
349 {
350
351 return ((*fp->f_ops->fo_write)(fp, uio, active_cred, flags, td));
352 }
353
354 static __inline int
355 fo_truncate(struct file *fp, off_t length, struct ucred *active_cred,
356 struct thread *td)
357 {
358
359 return ((*fp->f_ops->fo_truncate)(fp, length, active_cred, td));
360 }
361
362 static __inline int
363 fo_ioctl(struct file *fp, u_long com, void *data, struct ucred *active_cred,
364 struct thread *td)
365 {
366
367 return ((*fp->f_ops->fo_ioctl)(fp, com, data, active_cred, td));
368 }
369
370 static __inline int
371 fo_poll(struct file *fp, int events, struct ucred *active_cred,
372 struct thread *td)
373 {
374
375 return ((*fp->f_ops->fo_poll)(fp, events, active_cred, td));
376 }
377
378 static __inline int
379 fo_stat(struct file *fp, struct stat *sb, struct ucred *active_cred)
380 {
381
382 return ((*fp->f_ops->fo_stat)(fp, sb, active_cred));
383 }
384
385 static __inline int
386 fo_close(struct file *fp, struct thread *td)
387 {
388
389 return ((*fp->f_ops->fo_close)(fp, td));
390 }
391
392 static __inline int
393 fo_kqfilter(struct file *fp, struct knote *kn)
394 {
395
396 return ((*fp->f_ops->fo_kqfilter)(fp, kn));
397 }
398
399 static __inline int
400 fo_chmod(struct file *fp, mode_t mode, struct ucred *active_cred,
401 struct thread *td)
402 {
403
404 return ((*fp->f_ops->fo_chmod)(fp, mode, active_cred, td));
405 }
406
407 static __inline int
408 fo_chown(struct file *fp, uid_t uid, gid_t gid, struct ucred *active_cred,
409 struct thread *td)
410 {
411
412 return ((*fp->f_ops->fo_chown)(fp, uid, gid, active_cred, td));
413 }
414
415 static __inline int
416 fo_sendfile(struct file *fp, int sockfd, struct uio *hdr_uio,
417 struct uio *trl_uio, off_t offset, size_t nbytes, off_t *sent, int flags,
418 struct thread *td)
419 {
420
421 return ((*fp->f_ops->fo_sendfile)(fp, sockfd, hdr_uio, trl_uio, offset,
422 nbytes, sent, flags, td));
423 }
424
425 static __inline int
426 fo_seek(struct file *fp, off_t offset, int whence, struct thread *td)
427 {
428
429 return ((*fp->f_ops->fo_seek)(fp, offset, whence, td));
430 }
431
432 static __inline int
433 fo_fill_kinfo(struct file *fp, struct kinfo_file *kif, struct filedesc *fdp)
434 {
435
436 return ((*fp->f_ops->fo_fill_kinfo)(fp, kif, fdp));
437 }
438
439 static __inline int
440 fo_mmap(struct file *fp, vm_map_t map, vm_offset_t *addr, vm_size_t size,
441 vm_prot_t prot, vm_prot_t cap_maxprot, int flags, vm_ooffset_t foff,
442 struct thread *td)
443 {
444
445 if (fp->f_ops->fo_mmap == NULL)
446 return (ENODEV);
447 return ((*fp->f_ops->fo_mmap)(fp, map, addr, size, prot, cap_maxprot,
448 flags, foff, td));
449 }
450
451 static __inline int
452 fo_aio_queue(struct file *fp, struct kaiocb *job)
453 {
454
455 return ((*fp->f_ops->fo_aio_queue)(fp, job));
456 }
457
458 static __inline int
459 fo_add_seals(struct file *fp, int seals)
460 {
461
462 if (fp->f_ops->fo_add_seals == NULL)
463 return (EINVAL);
464 return ((*fp->f_ops->fo_add_seals)(fp, seals));
465 }
466
467 static __inline int
468 fo_get_seals(struct file *fp, int *seals)
469 {
470
471 if (fp->f_ops->fo_get_seals == NULL)
472 return (EINVAL);
473 return ((*fp->f_ops->fo_get_seals)(fp, seals));
474 }
475
476 static __inline int
477 fo_fallocate(struct file *fp, off_t offset, off_t len, struct thread *td)
478 {
479
480 if (fp->f_ops->fo_fallocate == NULL)
481 return (ENODEV);
482 return ((*fp->f_ops->fo_fallocate)(fp, offset, len, td));
483 }
484
485 static __inline int fo_fspacectl(struct file *fp, int cmd, off_t *offset,
486 off_t *length, int flags, struct ucred *active_cred, struct thread *td)
487 {
488
489 if (fp->f_ops->fo_fspacectl == NULL)
490 return (ENODEV);
491 return ((*fp->f_ops->fo_fspacectl)(fp, cmd, offset, length, flags,
492 active_cred, td));
493 }
494
495
496 #endif /* _KERNEL */
497
498 #endif /* !SYS_FILE_H */
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