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
32 #ifndef _SYS_FILE_H_
33 #define _SYS_FILE_H_
34
35 #ifndef _KERNEL
36 #include <sys/types.h> /* XXX */
37 #include <sys/fcntl.h>
38 #include <sys/unistd.h>
39 #else
40 #include <sys/errno.h>
41 #include <sys/_lock.h>
42 #include <sys/_mutex.h>
43 #include <sys/_null.h>
44 #include <sys/queue.h>
45 #include <sys/refcount.h>
46 #include <vm/vm.h>
47
48 struct filedesc;
49 struct proc;
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_TIMERFD 14 /* timerfd */
74 #define DTYPE_INOTIFY 15 /* inotify descriptor */
75 #define DTYPE_JAILDESC 16 /* jail descriptor */
76
77 #ifdef _KERNEL
78
79 struct file;
80 struct filecaps;
81 struct kaiocb;
82 struct kinfo_file;
83 struct ucred;
84
85 #define FOF_OFFSET 0x01 /* Use the offset in uio argument */
86 #define FOF_NOLOCK 0x02 /* Do not take FOFFSET_LOCK */
87 #define FOF_NEXTOFF_R 0x04 /* Also update f_nextoff[UIO_READ] */
88 #define FOF_NEXTOFF_W 0x08 /* Also update f_nextoff[UIO_WRITE] */
89 #define FOF_NOUPDATE 0x10 /* Do not update f_offset */
90 off_t foffset_lock(struct file *fp, int flags);
91 void foffset_lock_pair(struct file *fp1, off_t *off1p, struct file *fp2,
92 off_t *off2p, int flags);
93 void foffset_lock_uio(struct file *fp, struct uio *uio, int flags);
94 void foffset_unlock(struct file *fp, off_t val, int flags);
95 void foffset_unlock_uio(struct file *fp, struct uio *uio, int flags);
96 void fsetfl_lock(struct file *fp);
97 void fsetfl_unlock(struct file *fp);
98
99 static inline off_t
foffset_get(struct file * fp)100 foffset_get(struct file *fp)
101 {
102
103 return (foffset_lock(fp, FOF_NOLOCK));
104 }
105
106 typedef int fo_rdwr_t(struct file *fp, struct uio *uio,
107 struct ucred *active_cred, int flags,
108 struct thread *td);
109 typedef int fo_truncate_t(struct file *fp, off_t length,
110 struct ucred *active_cred, struct thread *td);
111 typedef int fo_ioctl_t(struct file *fp, u_long com, void *data,
112 struct ucred *active_cred, struct thread *td);
113 typedef int fo_poll_t(struct file *fp, int events,
114 struct ucred *active_cred, struct thread *td);
115 typedef int fo_kqfilter_t(struct file *fp, struct knote *kn);
116 typedef int fo_stat_t(struct file *fp, struct stat *sb,
117 struct ucred *active_cred);
118 typedef int fo_close_t(struct file *fp, struct thread *td);
119 typedef int fo_chmod_t(struct file *fp, mode_t mode,
120 struct ucred *active_cred, struct thread *td);
121 typedef int fo_chown_t(struct file *fp, uid_t uid, gid_t gid,
122 struct ucred *active_cred, struct thread *td);
123 typedef int fo_sendfile_t(struct file *fp, int sockfd, struct uio *hdr_uio,
124 struct uio *trl_uio, off_t offset, size_t nbytes,
125 off_t *sent, int flags, struct thread *td);
126 typedef int fo_seek_t(struct file *fp, off_t offset, int whence,
127 struct thread *td);
128 typedef int fo_fill_kinfo_t(struct file *fp, struct kinfo_file *kif,
129 struct filedesc *fdp);
130 typedef int fo_mmap_t(struct file *fp, vm_map_t map, vm_offset_t *addr,
131 vm_size_t size, vm_prot_t prot, vm_prot_t cap_maxprot,
132 int flags, vm_ooffset_t foff, struct thread *td);
133 typedef int fo_aio_queue_t(struct file *fp, struct kaiocb *job);
134 typedef int fo_add_seals_t(struct file *fp, int flags);
135 typedef int fo_get_seals_t(struct file *fp, int *flags);
136 typedef int fo_fallocate_t(struct file *fp, off_t offset, off_t len,
137 struct thread *td);
138 typedef int fo_fspacectl_t(struct file *fp, int cmd,
139 off_t *offset, off_t *length, int flags,
140 struct ucred *active_cred, struct thread *td);
141 typedef int fo_cmp_t(struct file *fp, struct file *fp1, struct thread *td);
142 typedef int fo_spare_t(struct file *fp);
143 typedef int fo_flags_t;
144
145 struct fileops {
146 fo_rdwr_t *fo_read;
147 fo_rdwr_t *fo_write;
148 fo_truncate_t *fo_truncate;
149 fo_ioctl_t *fo_ioctl;
150 fo_poll_t *fo_poll;
151 fo_kqfilter_t *fo_kqfilter;
152 fo_stat_t *fo_stat;
153 fo_close_t *fo_close;
154 fo_chmod_t *fo_chmod;
155 fo_chown_t *fo_chown;
156 fo_sendfile_t *fo_sendfile;
157 fo_seek_t *fo_seek;
158 fo_fill_kinfo_t *fo_fill_kinfo;
159 fo_mmap_t *fo_mmap;
160 fo_aio_queue_t *fo_aio_queue;
161 fo_add_seals_t *fo_add_seals;
162 fo_get_seals_t *fo_get_seals;
163 fo_fallocate_t *fo_fallocate;
164 fo_fspacectl_t *fo_fspacectl;
165 fo_cmp_t *fo_cmp;
166 fo_spare_t *fo_spares[8]; /* Spare slots */
167 fo_flags_t fo_flags; /* DFLAG_* below */
168 };
169
170 #define DFLAG_PASSABLE 0x01 /* may be passed via unix sockets. */
171 #define DFLAG_SEEKABLE 0x02 /* seekable / nonsequential */
172 #endif /* _KERNEL */
173
174 #if defined(_KERNEL) || defined(_WANT_FILE)
175 /*
176 * Kernel descriptor table.
177 * One entry for each open kernel vnode and socket.
178 *
179 * Below is the list of locks that protects members in struct file.
180 *
181 * (a) f_vnode lock required (shared allows both reads and writes)
182 * (f) updated with atomics and blocking on sleepq
183 * (d) cdevpriv_mtx
184 * none not locked
185 */
186
187 #if __BSD_VISIBLE
188 struct fadvise_info {
189 int fa_advice; /* (f) FADV_* type. */
190 off_t fa_start; /* (f) Region start. */
191 off_t fa_end; /* (f) Region end. */
192 };
193
194 struct file {
195 volatile u_int f_flag; /* see fcntl.h */
196 volatile u_int f_count; /* reference count */
197 void *f_data; /* file descriptor specific data */
198 const struct fileops *f_ops; /* File operations */
199 struct vnode *f_vnode; /* NULL or applicable vnode */
200 struct ucred *f_cred; /* associated credentials. */
201 short f_type; /* descriptor type */
202 short f_vflags; /* (f) Sleep lock flags for members */
203 /*
204 * DTYPE_VNODE specific fields.
205 */
206 union {
207 int16_t f_seqcount[2]; /* (a) Count of seq. reads and writes. */
208 int f_pipegen;
209 };
210 off_t f_nextoff[2]; /* next expected read/write offset. */
211 union {
212 struct cdev_privdata *fvn_cdevpriv;
213 /* (d) Private data for the cdev. */
214 struct fadvise_info *fvn_advice;
215 } f_vnun;
216 /*
217 * DFLAG_SEEKABLE specific fields
218 */
219 off_t f_offset;
220 };
221
222 #define f_cdevpriv f_vnun.fvn_cdevpriv
223 #define f_advice f_vnun.fvn_advice
224
225 #define FILE_V_FOFFSET_LOCKED 0x0001
226 #define FILE_V_FOFFSET_LOCK_WAITING 0x0002
227 #define FILE_V_SETFL_LOCKED 0x0004
228 #define FILE_V_SETFL_LOCK_WAITING 0x0008
229 #endif /* __BSD_VISIBLE */
230
231 #endif /* _KERNEL || _WANT_FILE */
232
233 /*
234 * Userland version of struct file, for sysctl
235 */
236 #if __BSD_VISIBLE
237 struct xfile {
238 ksize_t xf_size; /* size of struct xfile */
239 pid_t xf_pid; /* owning process */
240 uid_t xf_uid; /* effective uid of owning process */
241 int xf_fd; /* descriptor number */
242 int _xf_int_pad1;
243 kvaddr_t xf_file; /* address of struct file */
244 short xf_type; /* descriptor type */
245 short _xf_short_pad1;
246 int xf_count; /* reference count */
247 int xf_msgcount; /* references from message queue */
248 int _xf_int_pad2;
249 off_t xf_offset; /* file offset */
250 kvaddr_t xf_data; /* file descriptor specific data */
251 kvaddr_t xf_vnode; /* vnode pointer */
252 u_int xf_flag; /* flags (see fcntl.h) */
253 int _xf_int_pad3;
254 int64_t _xf_int64_pad[6];
255 };
256 #endif /* __BSD_VISIBLE */
257
258 #ifdef _KERNEL
259
260 extern const struct fileops vnops;
261 extern const struct fileops badfileops;
262 extern const struct fileops path_fileops;
263 extern const struct fileops socketops;
264 extern int maxfiles; /* kernel limit on number of open files */
265 extern int maxfilesperproc; /* per process limit on number of open files */
266
267 int fget(struct thread *td, int fd, const cap_rights_t *rightsp,
268 struct file **fpp);
269 int fget_mmap(struct thread *td, int fd, const cap_rights_t *rightsp,
270 vm_prot_t *maxprotp, struct file **fpp);
271 int fget_read(struct thread *td, int fd, const cap_rights_t *rightsp,
272 struct file **fpp);
273 int fget_write(struct thread *td, int fd, const cap_rights_t *rightsp,
274 struct file **fpp);
275 int fget_fcntl(struct thread *td, int fd, const cap_rights_t *rightsp,
276 int needfcntl, struct file **fpp);
277 int _fdrop(struct file *fp, struct thread *td);
278 int fget_remote(struct thread *td, struct proc *p, int fd, struct file **fpp);
279 int fget_remote_foreach(struct thread *td, struct proc *p,
280 int (*fn)(struct proc *, int, struct file *, void *), void *arg);
281
282 fo_rdwr_t invfo_rdwr;
283 fo_truncate_t invfo_truncate;
284 fo_ioctl_t invfo_ioctl;
285 fo_poll_t invfo_poll;
286 fo_kqfilter_t invfo_kqfilter;
287 fo_chmod_t invfo_chmod;
288 fo_chown_t invfo_chown;
289 fo_sendfile_t invfo_sendfile;
290 fo_stat_t vn_statfile;
291 fo_sendfile_t vn_sendfile;
292 fo_seek_t vn_seek;
293 fo_fill_kinfo_t vn_fill_kinfo;
294 fo_kqfilter_t vn_kqfilter_opath;
295 int vn_fill_kinfo_vnode(struct vnode *vp, struct kinfo_file *kif);
296 int file_kcmp_generic(struct file *fp1, struct file *fp2, struct thread *td);
297
298 void finit(struct file *, u_int, short, void *, const struct fileops *);
299 void finit_vnode(struct file *, u_int, void *, const struct fileops *);
300 int fgetvp(struct thread *td, int fd, const cap_rights_t *rightsp,
301 struct vnode **vpp);
302 int fgetvp_exec(struct thread *td, int fd, const cap_rights_t *rightsp,
303 struct vnode **vpp);
304 int fgetvp_rights(struct thread *td, int fd, const cap_rights_t *needrightsp,
305 struct filecaps *havecaps, struct vnode **vpp);
306 int fgetvp_read(struct thread *td, int fd, const cap_rights_t *rightsp,
307 struct vnode **vpp);
308 int fgetvp_write(struct thread *td, int fd, const cap_rights_t *rightsp,
309 struct vnode **vpp);
310 int fgetvp_lookup_smr(struct nameidata *ndp, struct vnode **vpp, int *flagsp);
311 int fgetvp_lookup(struct nameidata *ndp, struct vnode **vpp);
312
313 static __inline __result_use_check bool
fhold(struct file * fp)314 fhold(struct file *fp)
315 {
316 return (refcount_acquire_checked(&fp->f_count));
317 }
318
319 #define fdrop(fp, td) ({ \
320 struct file *_fp; \
321 int _error; \
322 \
323 _error = 0; \
324 _fp = (fp); \
325 if (__predict_false(refcount_release(&_fp->f_count))) \
326 _error = _fdrop(_fp, td); \
327 _error; \
328 })
329
330 #define fdrop_close(fp, td) ({ \
331 struct file *_fp; \
332 int _error; \
333 \
334 _error = 0; \
335 _fp = (fp); \
336 if (__predict_true(refcount_release(&_fp->f_count))) \
337 _error = _fdrop(_fp, td); \
338 _error; \
339 })
340
341 static __inline fo_rdwr_t fo_read;
342 static __inline fo_rdwr_t fo_write;
343 static __inline fo_truncate_t fo_truncate;
344 static __inline fo_ioctl_t fo_ioctl;
345 static __inline fo_poll_t fo_poll;
346 static __inline fo_kqfilter_t fo_kqfilter;
347 static __inline fo_stat_t fo_stat;
348 static __inline fo_close_t fo_close;
349 static __inline fo_chmod_t fo_chmod;
350 static __inline fo_chown_t fo_chown;
351 static __inline fo_sendfile_t fo_sendfile;
352
353 static __inline int
fo_read(struct file * fp,struct uio * uio,struct ucred * active_cred,int flags,struct thread * td)354 fo_read(struct file *fp, struct uio *uio, struct ucred *active_cred,
355 int flags, struct thread *td)
356 {
357
358 return ((*fp->f_ops->fo_read)(fp, uio, active_cred, flags, td));
359 }
360
361 static __inline int
fo_write(struct file * fp,struct uio * uio,struct ucred * active_cred,int flags,struct thread * td)362 fo_write(struct file *fp, struct uio *uio, struct ucred *active_cred,
363 int flags, struct thread *td)
364 {
365
366 return ((*fp->f_ops->fo_write)(fp, uio, active_cred, flags, td));
367 }
368
369 static __inline int
fo_truncate(struct file * fp,off_t length,struct ucred * active_cred,struct thread * td)370 fo_truncate(struct file *fp, off_t length, struct ucred *active_cred,
371 struct thread *td)
372 {
373
374 return ((*fp->f_ops->fo_truncate)(fp, length, active_cred, td));
375 }
376
377 static __inline int
fo_ioctl(struct file * fp,u_long com,void * data,struct ucred * active_cred,struct thread * td)378 fo_ioctl(struct file *fp, u_long com, void *data, struct ucred *active_cred,
379 struct thread *td)
380 {
381
382 return ((*fp->f_ops->fo_ioctl)(fp, com, data, active_cred, td));
383 }
384
385 static __inline int
fo_poll(struct file * fp,int events,struct ucred * active_cred,struct thread * td)386 fo_poll(struct file *fp, int events, struct ucred *active_cred,
387 struct thread *td)
388 {
389
390 return ((*fp->f_ops->fo_poll)(fp, events, active_cred, td));
391 }
392
393 static __inline int
fo_stat(struct file * fp,struct stat * sb,struct ucred * active_cred)394 fo_stat(struct file *fp, struct stat *sb, struct ucred *active_cred)
395 {
396
397 return ((*fp->f_ops->fo_stat)(fp, sb, active_cred));
398 }
399
400 static __inline int
fo_close(struct file * fp,struct thread * td)401 fo_close(struct file *fp, struct thread *td)
402 {
403
404 return ((*fp->f_ops->fo_close)(fp, td));
405 }
406
407 static __inline int
fo_kqfilter(struct file * fp,struct knote * kn)408 fo_kqfilter(struct file *fp, struct knote *kn)
409 {
410
411 return ((*fp->f_ops->fo_kqfilter)(fp, kn));
412 }
413
414 static __inline int
fo_chmod(struct file * fp,mode_t mode,struct ucred * active_cred,struct thread * td)415 fo_chmod(struct file *fp, mode_t mode, struct ucred *active_cred,
416 struct thread *td)
417 {
418
419 return ((*fp->f_ops->fo_chmod)(fp, mode, active_cred, td));
420 }
421
422 static __inline int
fo_chown(struct file * fp,uid_t uid,gid_t gid,struct ucred * active_cred,struct thread * td)423 fo_chown(struct file *fp, uid_t uid, gid_t gid, struct ucred *active_cred,
424 struct thread *td)
425 {
426
427 return ((*fp->f_ops->fo_chown)(fp, uid, gid, active_cred, td));
428 }
429
430 static __inline int
fo_sendfile(struct file * fp,int sockfd,struct uio * hdr_uio,struct uio * trl_uio,off_t offset,size_t nbytes,off_t * sent,int flags,struct thread * td)431 fo_sendfile(struct file *fp, int sockfd, struct uio *hdr_uio,
432 struct uio *trl_uio, off_t offset, size_t nbytes, off_t *sent, int flags,
433 struct thread *td)
434 {
435
436 return ((*fp->f_ops->fo_sendfile)(fp, sockfd, hdr_uio, trl_uio, offset,
437 nbytes, sent, flags, td));
438 }
439
440 static __inline int
fo_seek(struct file * fp,off_t offset,int whence,struct thread * td)441 fo_seek(struct file *fp, off_t offset, int whence, struct thread *td)
442 {
443
444 return ((*fp->f_ops->fo_seek)(fp, offset, whence, td));
445 }
446
447 static __inline int
fo_fill_kinfo(struct file * fp,struct kinfo_file * kif,struct filedesc * fdp)448 fo_fill_kinfo(struct file *fp, struct kinfo_file *kif, struct filedesc *fdp)
449 {
450
451 return ((*fp->f_ops->fo_fill_kinfo)(fp, kif, fdp));
452 }
453
454 static __inline int
fo_mmap(struct file * fp,vm_map_t map,vm_offset_t * addr,vm_size_t size,vm_prot_t prot,vm_prot_t cap_maxprot,int flags,vm_ooffset_t foff,struct thread * td)455 fo_mmap(struct file *fp, vm_map_t map, vm_offset_t *addr, vm_size_t size,
456 vm_prot_t prot, vm_prot_t cap_maxprot, int flags, vm_ooffset_t foff,
457 struct thread *td)
458 {
459
460 if (fp->f_ops->fo_mmap == NULL)
461 return (ENODEV);
462 return ((*fp->f_ops->fo_mmap)(fp, map, addr, size, prot, cap_maxprot,
463 flags, foff, td));
464 }
465
466 static __inline int
fo_aio_queue(struct file * fp,struct kaiocb * job)467 fo_aio_queue(struct file *fp, struct kaiocb *job)
468 {
469
470 return ((*fp->f_ops->fo_aio_queue)(fp, job));
471 }
472
473 static __inline int
fo_add_seals(struct file * fp,int seals)474 fo_add_seals(struct file *fp, int seals)
475 {
476
477 if (fp->f_ops->fo_add_seals == NULL)
478 return (EINVAL);
479 return ((*fp->f_ops->fo_add_seals)(fp, seals));
480 }
481
482 static __inline int
fo_get_seals(struct file * fp,int * seals)483 fo_get_seals(struct file *fp, int *seals)
484 {
485
486 if (fp->f_ops->fo_get_seals == NULL)
487 return (EINVAL);
488 return ((*fp->f_ops->fo_get_seals)(fp, seals));
489 }
490
491 static __inline int
fo_fallocate(struct file * fp,off_t offset,off_t len,struct thread * td)492 fo_fallocate(struct file *fp, off_t offset, off_t len, struct thread *td)
493 {
494
495 if (fp->f_ops->fo_fallocate == NULL)
496 return (ENODEV);
497 return ((*fp->f_ops->fo_fallocate)(fp, offset, len, td));
498 }
499
500 static __inline int
fo_fspacectl(struct file * fp,int cmd,off_t * offset,off_t * length,int flags,struct ucred * active_cred,struct thread * td)501 fo_fspacectl(struct file *fp, int cmd, off_t *offset, off_t *length,
502 int flags, struct ucred *active_cred, struct thread *td)
503 {
504
505 if (fp->f_ops->fo_fspacectl == NULL)
506 return (ENODEV);
507 return ((*fp->f_ops->fo_fspacectl)(fp, cmd, offset, length, flags,
508 active_cred, td));
509 }
510
511 static __inline int
fo_cmp(struct file * fp1,struct file * fp2,struct thread * td)512 fo_cmp(struct file *fp1, struct file *fp2, struct thread *td)
513 {
514
515 if (fp1->f_ops->fo_cmp == NULL)
516 return (ENODEV);
517 return ((*fp1->f_ops->fo_cmp)(fp1, fp2, td));
518 }
519
520 #endif /* _KERNEL */
521
522 #endif /* !SYS_FILE_H */
523