2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (c) 1982, 1986, 1989, 1993
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31 * @(#)file.h 8.3 (Berkeley) 1/9/95
39 #include <sys/types.h> /* XXX */
40 #include <sys/fcntl.h>
41 #include <sys/unistd.h>
43 #include <sys/queue.h>
44 #include <sys/refcount.h>
45 #include <sys/_lock.h>
46 #include <sys/_mutex.h>
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 */
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);
94 foffset_get(struct file *fp)
97 return (foffset_lock(fp, FOF_NOLOCK));
100 typedef int fo_rdwr_t(struct file *fp, struct uio *uio,
101 struct ucred *active_cred, int flags,
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,
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,
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_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_flags_t fo_flags; /* DFLAG_* below */
160 #define DFLAG_PASSABLE 0x01 /* may be passed via unix sockets. */
161 #define DFLAG_SEEKABLE 0x02 /* seekable / nonsequential */
164 #if defined(_KERNEL) || defined(_WANT_FILE)
166 * Kernel descriptor table.
167 * One entry for each open kernel vnode and socket.
169 * Below is the list of locks that protects members in struct file.
171 * (a) f_vnode lock required (shared allows both reads and writes)
172 * (f) updated with atomics and blocking on sleepq
177 struct fadvise_info {
178 int fa_advice; /* (f) FADV_* type. */
179 off_t fa_start; /* (f) Region start. */
180 off_t fa_end; /* (f) Region end. */
184 volatile u_int f_flag; /* see fcntl.h */
185 volatile u_int f_count; /* reference count */
186 void *f_data; /* file descriptor specific data */
187 struct fileops *f_ops; /* File operations */
188 struct vnode *f_vnode; /* NULL or applicable vnode */
189 struct ucred *f_cred; /* associated credentials. */
190 short f_type; /* descriptor type */
191 short f_vnread_flags; /* (f) Sleep lock for f_offset */
193 * DTYPE_VNODE specific fields.
196 int16_t f_seqcount[2]; /* (a) Count of seq. reads and writes. */
199 off_t f_nextoff[2]; /* next expected read/write offset. */
201 struct cdev_privdata *fvn_cdevpriv;
202 /* (d) Private data for the cdev. */
203 struct fadvise_info *fvn_advice;
206 * DFLAG_SEEKABLE specific fields
211 #define f_cdevpriv f_vnun.fvn_cdevpriv
212 #define f_advice f_vnun.fvn_advice
214 #define FOFFSET_LOCKED 0x1
215 #define FOFFSET_LOCK_WAITING 0x2
217 #endif /* _KERNEL || _WANT_FILE */
220 * Userland version of struct file, for sysctl
223 ksize_t xf_size; /* size of struct xfile */
224 pid_t xf_pid; /* owning process */
225 uid_t xf_uid; /* effective uid of owning process */
226 int xf_fd; /* descriptor number */
228 kvaddr_t xf_file; /* address of struct file */
229 short xf_type; /* descriptor type */
230 short _xf_short_pad1;
231 int xf_count; /* reference count */
232 int xf_msgcount; /* references from message queue */
234 off_t xf_offset; /* file offset */
235 kvaddr_t xf_data; /* file descriptor specific data */
236 kvaddr_t xf_vnode; /* vnode pointer */
237 u_int xf_flag; /* flags (see fcntl.h) */
239 int64_t _xf_int64_pad[6];
244 extern struct fileops vnops;
245 extern struct fileops badfileops;
246 extern struct fileops path_fileops;
247 extern struct fileops socketops;
248 extern int maxfiles; /* kernel limit on number of open files */
249 extern int maxfilesperproc; /* per process limit on number of open files */
251 int fget(struct thread *td, int fd, cap_rights_t *rightsp, struct file **fpp);
252 int fget_mmap(struct thread *td, int fd, cap_rights_t *rightsp,
253 vm_prot_t *maxprotp, struct file **fpp);
254 int fget_read(struct thread *td, int fd, cap_rights_t *rightsp,
256 int fget_write(struct thread *td, int fd, cap_rights_t *rightsp,
258 int fget_fcntl(struct thread *td, int fd, cap_rights_t *rightsp,
259 int needfcntl, struct file **fpp);
260 int _fdrop(struct file *fp, struct thread *td);
262 fo_rdwr_t invfo_rdwr;
263 fo_truncate_t invfo_truncate;
264 fo_ioctl_t invfo_ioctl;
265 fo_poll_t invfo_poll;
266 fo_kqfilter_t invfo_kqfilter;
267 fo_chmod_t invfo_chmod;
268 fo_chown_t invfo_chown;
269 fo_sendfile_t invfo_sendfile;
270 fo_stat_t vn_statfile;
271 fo_sendfile_t vn_sendfile;
273 fo_fill_kinfo_t vn_fill_kinfo;
274 fo_kqfilter_t vn_kqfilter_opath;
275 int vn_fill_kinfo_vnode(struct vnode *vp, struct kinfo_file *kif);
277 void finit(struct file *, u_int, short, void *, struct fileops *);
278 void finit_vnode(struct file *, u_int, void *, struct fileops *);
279 int fgetvp(struct thread *td, int fd, cap_rights_t *rightsp,
281 int fgetvp_exec(struct thread *td, int fd, cap_rights_t *rightsp,
283 int fgetvp_rights(struct thread *td, int fd, cap_rights_t *needrightsp,
284 struct filecaps *havecaps, struct vnode **vpp);
285 int fgetvp_read(struct thread *td, int fd, cap_rights_t *rightsp,
287 int fgetvp_write(struct thread *td, int fd, cap_rights_t *rightsp,
289 int fgetvp_lookup_smr(int fd, struct nameidata *ndp, struct vnode **vpp, bool *fsearch);
291 static __inline __result_use_check bool
292 fhold(struct file *fp)
294 return (refcount_acquire_checked(&fp->f_count));
297 #define fdrop(fp, td) ({ \
303 if (__predict_false(refcount_release(&_fp->f_count))) \
304 _error = _fdrop(_fp, td); \
308 #define fdrop_close(fp, td) ({ \
314 if (__predict_true(refcount_release(&_fp->f_count))) \
315 _error = _fdrop(_fp, td); \
319 static __inline fo_rdwr_t fo_read;
320 static __inline fo_rdwr_t fo_write;
321 static __inline fo_truncate_t fo_truncate;
322 static __inline fo_ioctl_t fo_ioctl;
323 static __inline fo_poll_t fo_poll;
324 static __inline fo_kqfilter_t fo_kqfilter;
325 static __inline fo_stat_t fo_stat;
326 static __inline fo_close_t fo_close;
327 static __inline fo_chmod_t fo_chmod;
328 static __inline fo_chown_t fo_chown;
329 static __inline fo_sendfile_t fo_sendfile;
332 fo_read(struct file *fp, struct uio *uio, struct ucred *active_cred,
333 int flags, struct thread *td)
336 return ((*fp->f_ops->fo_read)(fp, uio, active_cred, flags, td));
340 fo_write(struct file *fp, struct uio *uio, struct ucred *active_cred,
341 int flags, struct thread *td)
344 return ((*fp->f_ops->fo_write)(fp, uio, active_cred, flags, td));
348 fo_truncate(struct file *fp, off_t length, struct ucred *active_cred,
352 return ((*fp->f_ops->fo_truncate)(fp, length, active_cred, td));
356 fo_ioctl(struct file *fp, u_long com, void *data, struct ucred *active_cred,
360 return ((*fp->f_ops->fo_ioctl)(fp, com, data, active_cred, td));
364 fo_poll(struct file *fp, int events, struct ucred *active_cred,
368 return ((*fp->f_ops->fo_poll)(fp, events, active_cred, td));
372 fo_stat(struct file *fp, struct stat *sb, struct ucred *active_cred)
375 return ((*fp->f_ops->fo_stat)(fp, sb, active_cred));
379 fo_close(struct file *fp, struct thread *td)
382 return ((*fp->f_ops->fo_close)(fp, td));
386 fo_kqfilter(struct file *fp, struct knote *kn)
389 return ((*fp->f_ops->fo_kqfilter)(fp, kn));
393 fo_chmod(struct file *fp, mode_t mode, struct ucred *active_cred,
397 return ((*fp->f_ops->fo_chmod)(fp, mode, active_cred, td));
401 fo_chown(struct file *fp, uid_t uid, gid_t gid, struct ucred *active_cred,
405 return ((*fp->f_ops->fo_chown)(fp, uid, gid, active_cred, td));
409 fo_sendfile(struct file *fp, int sockfd, struct uio *hdr_uio,
410 struct uio *trl_uio, off_t offset, size_t nbytes, off_t *sent, int flags,
414 return ((*fp->f_ops->fo_sendfile)(fp, sockfd, hdr_uio, trl_uio, offset,
415 nbytes, sent, flags, td));
419 fo_seek(struct file *fp, off_t offset, int whence, struct thread *td)
422 return ((*fp->f_ops->fo_seek)(fp, offset, whence, td));
426 fo_fill_kinfo(struct file *fp, struct kinfo_file *kif, struct filedesc *fdp)
429 return ((*fp->f_ops->fo_fill_kinfo)(fp, kif, fdp));
433 fo_mmap(struct file *fp, vm_map_t map, vm_offset_t *addr, vm_size_t size,
434 vm_prot_t prot, vm_prot_t cap_maxprot, int flags, vm_ooffset_t foff,
438 if (fp->f_ops->fo_mmap == NULL)
440 return ((*fp->f_ops->fo_mmap)(fp, map, addr, size, prot, cap_maxprot,
445 fo_aio_queue(struct file *fp, struct kaiocb *job)
448 return ((*fp->f_ops->fo_aio_queue)(fp, job));
452 fo_add_seals(struct file *fp, int seals)
455 if (fp->f_ops->fo_add_seals == NULL)
457 return ((*fp->f_ops->fo_add_seals)(fp, seals));
461 fo_get_seals(struct file *fp, int *seals)
464 if (fp->f_ops->fo_get_seals == NULL)
466 return ((*fp->f_ops->fo_get_seals)(fp, seals));
470 fo_fallocate(struct file *fp, off_t offset, off_t len, struct thread *td)
473 if (fp->f_ops->fo_fallocate == NULL)
475 return ((*fp->f_ops->fo_fallocate)(fp, offset, len, td));
478 static __inline int fo_fspacectl(struct file *fp, int cmd, off_t *offset,
479 off_t *length, int flags, struct ucred *active_cred, struct thread *td)
482 if (fp->f_ops->fo_fspacectl == NULL)
484 return ((*fp->f_ops->fo_fspacectl)(fp, cmd, offset, length, flags,
491 #endif /* !SYS_FILE_H */