2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (c) 1982, 1986, 1989, 1993
5 * The Regents of the University of California. All rights reserved.
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8 * modification, are permitted provided that the following conditions
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11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
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14 * documentation and/or other materials provided with the distribution.
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28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * @(#)file.h 8.3 (Berkeley) 1/9/95
38 #include <sys/types.h> /* XXX */
39 #include <sys/fcntl.h>
40 #include <sys/unistd.h>
42 #include <sys/queue.h>
43 #include <sys/refcount.h>
44 #include <sys/_lock.h>
45 #include <sys/_mutex.h>
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_EVENTFD 13 /* eventfd */
72 #define DTYPE_TIMERFD 14 /* timerfd */
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_R 0x04 /* Also update f_nextoff[UIO_READ] */
85 #define FOF_NEXTOFF_W 0x08 /* Also update f_nextoff[UIO_WRITE] */
86 #define FOF_NOUPDATE 0x10 /* Do not update f_offset */
87 off_t foffset_lock(struct file *fp, int flags);
88 void foffset_lock_uio(struct file *fp, struct uio *uio, int flags);
89 void foffset_unlock(struct file *fp, off_t val, int flags);
90 void foffset_unlock_uio(struct file *fp, struct uio *uio, int flags);
93 foffset_get(struct file *fp)
96 return (foffset_lock(fp, FOF_NOLOCK));
99 typedef int fo_rdwr_t(struct file *fp, struct uio *uio,
100 struct ucred *active_cred, int flags,
102 typedef int fo_truncate_t(struct file *fp, off_t length,
103 struct ucred *active_cred, struct thread *td);
104 typedef int fo_ioctl_t(struct file *fp, u_long com, void *data,
105 struct ucred *active_cred, struct thread *td);
106 typedef int fo_poll_t(struct file *fp, int events,
107 struct ucred *active_cred, struct thread *td);
108 typedef int fo_kqfilter_t(struct file *fp, struct knote *kn);
109 typedef int fo_stat_t(struct file *fp, struct stat *sb,
110 struct ucred *active_cred);
111 typedef int fo_close_t(struct file *fp, struct thread *td);
112 typedef int fo_chmod_t(struct file *fp, mode_t mode,
113 struct ucred *active_cred, struct thread *td);
114 typedef int fo_chown_t(struct file *fp, uid_t uid, gid_t gid,
115 struct ucred *active_cred, struct thread *td);
116 typedef int fo_sendfile_t(struct file *fp, int sockfd, struct uio *hdr_uio,
117 struct uio *trl_uio, off_t offset, size_t nbytes,
118 off_t *sent, int flags, struct thread *td);
119 typedef int fo_seek_t(struct file *fp, off_t offset, int whence,
121 typedef int fo_fill_kinfo_t(struct file *fp, struct kinfo_file *kif,
122 struct filedesc *fdp);
123 typedef int fo_mmap_t(struct file *fp, vm_map_t map, vm_offset_t *addr,
124 vm_size_t size, vm_prot_t prot, vm_prot_t cap_maxprot,
125 int flags, vm_ooffset_t foff, struct thread *td);
126 typedef int fo_aio_queue_t(struct file *fp, struct kaiocb *job);
127 typedef int fo_add_seals_t(struct file *fp, int flags);
128 typedef int fo_get_seals_t(struct file *fp, int *flags);
129 typedef int fo_fallocate_t(struct file *fp, off_t offset, off_t len,
131 typedef int fo_fspacectl_t(struct file *fp, int cmd,
132 off_t *offset, off_t *length, int flags,
133 struct ucred *active_cred, struct thread *td);
134 typedef int fo_spare_t(struct file *fp);
135 typedef int fo_flags_t;
140 fo_truncate_t *fo_truncate;
141 fo_ioctl_t *fo_ioctl;
143 fo_kqfilter_t *fo_kqfilter;
145 fo_close_t *fo_close;
146 fo_chmod_t *fo_chmod;
147 fo_chown_t *fo_chown;
148 fo_sendfile_t *fo_sendfile;
150 fo_fill_kinfo_t *fo_fill_kinfo;
152 fo_aio_queue_t *fo_aio_queue;
153 fo_add_seals_t *fo_add_seals;
154 fo_get_seals_t *fo_get_seals;
155 fo_fallocate_t *fo_fallocate;
156 fo_fspacectl_t *fo_fspacectl;
157 fo_spare_t *fo_spares[8]; /* Spare slots */
158 fo_flags_t fo_flags; /* DFLAG_* below */
161 #define DFLAG_PASSABLE 0x01 /* may be passed via unix sockets. */
162 #define DFLAG_SEEKABLE 0x02 /* seekable / nonsequential */
165 #if defined(_KERNEL) || defined(_WANT_FILE)
167 * Kernel descriptor table.
168 * One entry for each open kernel vnode and socket.
170 * Below is the list of locks that protects members in struct file.
172 * (a) f_vnode lock required (shared allows both reads and writes)
173 * (f) updated with atomics and blocking on sleepq
179 struct fadvise_info {
180 int fa_advice; /* (f) FADV_* type. */
181 off_t fa_start; /* (f) Region start. */
182 off_t fa_end; /* (f) Region end. */
186 volatile u_int f_flag; /* see fcntl.h */
187 volatile u_int f_count; /* reference count */
188 void *f_data; /* file descriptor specific data */
189 struct fileops *f_ops; /* File operations */
190 struct vnode *f_vnode; /* NULL or applicable vnode */
191 struct ucred *f_cred; /* associated credentials. */
192 short f_type; /* descriptor type */
193 short f_vnread_flags; /* (f) Sleep lock for f_offset */
195 * DTYPE_VNODE specific fields.
198 int16_t f_seqcount[2]; /* (a) Count of seq. reads and writes. */
201 off_t f_nextoff[2]; /* next expected read/write offset. */
203 struct cdev_privdata *fvn_cdevpriv;
204 /* (d) Private data for the cdev. */
205 struct fadvise_info *fvn_advice;
208 * DFLAG_SEEKABLE specific fields
213 #define f_cdevpriv f_vnun.fvn_cdevpriv
214 #define f_advice f_vnun.fvn_advice
216 #define FOFFSET_LOCKED 0x1
217 #define FOFFSET_LOCK_WAITING 0x2
218 #endif /* __BSD_VISIBLE */
220 #endif /* _KERNEL || _WANT_FILE */
223 * Userland version of struct file, for sysctl
227 ksize_t xf_size; /* size of struct xfile */
228 pid_t xf_pid; /* owning process */
229 uid_t xf_uid; /* effective uid of owning process */
230 int xf_fd; /* descriptor number */
232 kvaddr_t xf_file; /* address of struct file */
233 short xf_type; /* descriptor type */
234 short _xf_short_pad1;
235 int xf_count; /* reference count */
236 int xf_msgcount; /* references from message queue */
238 off_t xf_offset; /* file offset */
239 kvaddr_t xf_data; /* file descriptor specific data */
240 kvaddr_t xf_vnode; /* vnode pointer */
241 u_int xf_flag; /* flags (see fcntl.h) */
243 int64_t _xf_int64_pad[6];
245 #endif /* __BSD_VISIBLE */
249 extern struct fileops vnops;
250 extern struct fileops badfileops;
251 extern struct fileops path_fileops;
252 extern struct fileops socketops;
253 extern int maxfiles; /* kernel limit on number of open files */
254 extern int maxfilesperproc; /* per process limit on number of open files */
256 int fget(struct thread *td, int fd, cap_rights_t *rightsp, struct file **fpp);
257 int fget_mmap(struct thread *td, int fd, cap_rights_t *rightsp,
258 vm_prot_t *maxprotp, struct file **fpp);
259 int fget_read(struct thread *td, int fd, cap_rights_t *rightsp,
261 int fget_write(struct thread *td, int fd, cap_rights_t *rightsp,
263 int fget_fcntl(struct thread *td, int fd, cap_rights_t *rightsp,
264 int needfcntl, struct file **fpp);
265 int _fdrop(struct file *fp, struct thread *td);
267 fo_rdwr_t invfo_rdwr;
268 fo_truncate_t invfo_truncate;
269 fo_ioctl_t invfo_ioctl;
270 fo_poll_t invfo_poll;
271 fo_kqfilter_t invfo_kqfilter;
272 fo_chmod_t invfo_chmod;
273 fo_chown_t invfo_chown;
274 fo_sendfile_t invfo_sendfile;
275 fo_stat_t vn_statfile;
276 fo_sendfile_t vn_sendfile;
278 fo_fill_kinfo_t vn_fill_kinfo;
279 fo_kqfilter_t vn_kqfilter_opath;
280 int vn_fill_kinfo_vnode(struct vnode *vp, struct kinfo_file *kif);
282 void finit(struct file *, u_int, short, void *, struct fileops *);
283 void finit_vnode(struct file *, u_int, void *, struct fileops *);
284 int fgetvp(struct thread *td, int fd, cap_rights_t *rightsp,
286 int fgetvp_exec(struct thread *td, int fd, cap_rights_t *rightsp,
288 int fgetvp_rights(struct thread *td, int fd, cap_rights_t *needrightsp,
289 struct filecaps *havecaps, struct vnode **vpp);
290 int fgetvp_read(struct thread *td, int fd, cap_rights_t *rightsp,
292 int fgetvp_write(struct thread *td, int fd, cap_rights_t *rightsp,
294 int fgetvp_lookup_smr(int fd, struct nameidata *ndp, struct vnode **vpp, bool *fsearch);
295 int fgetvp_lookup(int fd, struct nameidata *ndp, struct vnode **vpp);
297 static __inline __result_use_check bool
298 fhold(struct file *fp)
300 return (refcount_acquire_checked(&fp->f_count));
303 #define fdrop(fp, td) ({ \
309 if (__predict_false(refcount_release(&_fp->f_count))) \
310 _error = _fdrop(_fp, td); \
314 #define fdrop_close(fp, td) ({ \
320 if (__predict_true(refcount_release(&_fp->f_count))) \
321 _error = _fdrop(_fp, td); \
325 static __inline fo_rdwr_t fo_read;
326 static __inline fo_rdwr_t fo_write;
327 static __inline fo_truncate_t fo_truncate;
328 static __inline fo_ioctl_t fo_ioctl;
329 static __inline fo_poll_t fo_poll;
330 static __inline fo_kqfilter_t fo_kqfilter;
331 static __inline fo_stat_t fo_stat;
332 static __inline fo_close_t fo_close;
333 static __inline fo_chmod_t fo_chmod;
334 static __inline fo_chown_t fo_chown;
335 static __inline fo_sendfile_t fo_sendfile;
338 fo_read(struct file *fp, struct uio *uio, struct ucred *active_cred,
339 int flags, struct thread *td)
342 return ((*fp->f_ops->fo_read)(fp, uio, active_cred, flags, td));
346 fo_write(struct file *fp, struct uio *uio, struct ucred *active_cred,
347 int flags, struct thread *td)
350 return ((*fp->f_ops->fo_write)(fp, uio, active_cred, flags, td));
354 fo_truncate(struct file *fp, off_t length, struct ucred *active_cred,
358 return ((*fp->f_ops->fo_truncate)(fp, length, active_cred, td));
362 fo_ioctl(struct file *fp, u_long com, void *data, struct ucred *active_cred,
366 return ((*fp->f_ops->fo_ioctl)(fp, com, data, active_cred, td));
370 fo_poll(struct file *fp, int events, struct ucred *active_cred,
374 return ((*fp->f_ops->fo_poll)(fp, events, active_cred, td));
378 fo_stat(struct file *fp, struct stat *sb, struct ucred *active_cred)
381 return ((*fp->f_ops->fo_stat)(fp, sb, active_cred));
385 fo_close(struct file *fp, struct thread *td)
388 return ((*fp->f_ops->fo_close)(fp, td));
392 fo_kqfilter(struct file *fp, struct knote *kn)
395 return ((*fp->f_ops->fo_kqfilter)(fp, kn));
399 fo_chmod(struct file *fp, mode_t mode, struct ucred *active_cred,
403 return ((*fp->f_ops->fo_chmod)(fp, mode, active_cred, td));
407 fo_chown(struct file *fp, uid_t uid, gid_t gid, struct ucred *active_cred,
411 return ((*fp->f_ops->fo_chown)(fp, uid, gid, active_cred, td));
415 fo_sendfile(struct file *fp, int sockfd, struct uio *hdr_uio,
416 struct uio *trl_uio, off_t offset, size_t nbytes, off_t *sent, int flags,
420 return ((*fp->f_ops->fo_sendfile)(fp, sockfd, hdr_uio, trl_uio, offset,
421 nbytes, sent, flags, td));
425 fo_seek(struct file *fp, off_t offset, int whence, struct thread *td)
428 return ((*fp->f_ops->fo_seek)(fp, offset, whence, td));
432 fo_fill_kinfo(struct file *fp, struct kinfo_file *kif, struct filedesc *fdp)
435 return ((*fp->f_ops->fo_fill_kinfo)(fp, kif, fdp));
439 fo_mmap(struct file *fp, vm_map_t map, vm_offset_t *addr, vm_size_t size,
440 vm_prot_t prot, vm_prot_t cap_maxprot, int flags, vm_ooffset_t foff,
444 if (fp->f_ops->fo_mmap == NULL)
446 return ((*fp->f_ops->fo_mmap)(fp, map, addr, size, prot, cap_maxprot,
451 fo_aio_queue(struct file *fp, struct kaiocb *job)
454 return ((*fp->f_ops->fo_aio_queue)(fp, job));
458 fo_add_seals(struct file *fp, int seals)
461 if (fp->f_ops->fo_add_seals == NULL)
463 return ((*fp->f_ops->fo_add_seals)(fp, seals));
467 fo_get_seals(struct file *fp, int *seals)
470 if (fp->f_ops->fo_get_seals == NULL)
472 return ((*fp->f_ops->fo_get_seals)(fp, seals));
476 fo_fallocate(struct file *fp, off_t offset, off_t len, struct thread *td)
479 if (fp->f_ops->fo_fallocate == NULL)
481 return ((*fp->f_ops->fo_fallocate)(fp, offset, len, td));
484 static __inline int fo_fspacectl(struct file *fp, int cmd, off_t *offset,
485 off_t *length, int flags, struct ucred *active_cred, struct thread *td)
488 if (fp->f_ops->fo_fspacectl == NULL)
490 return ((*fp->f_ops->fo_fspacectl)(fp, cmd, offset, length, flags,
497 #endif /* !SYS_FILE_H */