2 * Copyright (c) 1982, 1986, 1989, 1993
3 * The Regents of the University of California. All rights reserved.
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6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
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19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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29 * @(#)file.h 8.3 (Berkeley) 1/9/95
37 #include <sys/types.h> /* XXX */
38 #include <sys/fcntl.h>
39 #include <sys/unistd.h>
41 #include <sys/queue.h>
42 #include <sys/refcount.h>
43 #include <sys/_lock.h>
44 #include <sys/_mutex.h>
56 #define DTYPE_VNODE 1 /* file */
57 #define DTYPE_SOCKET 2 /* communications endpoint */
58 #define DTYPE_PIPE 3 /* pipe */
59 #define DTYPE_FIFO 4 /* fifo (named pipe) */
60 #define DTYPE_KQUEUE 5 /* event queue */
61 #define DTYPE_CRYPTO 6 /* crypto */
62 #define DTYPE_MQUEUE 7 /* posix message queue */
63 #define DTYPE_SHM 8 /* swap-backed shared memory */
64 #define DTYPE_SEM 9 /* posix semaphore */
65 #define DTYPE_PTS 10 /* pseudo teletype master device */
66 #define DTYPE_DEV 11 /* Device specific fd type */
67 #define DTYPE_PROCDESC 12 /* process descriptor */
75 #define FOF_OFFSET 0x01 /* Use the offset in uio argument */
76 #define FOF_NOLOCK 0x02 /* Do not take FOFFSET_LOCK */
77 #define FOF_NEXTOFF 0x04 /* Also update f_nextoff */
78 #define FOF_NOUPDATE 0x10 /* Do not update f_offset */
79 off_t foffset_lock(struct file *fp, int flags);
80 void foffset_lock_uio(struct file *fp, struct uio *uio, int flags);
81 void foffset_unlock(struct file *fp, off_t val, int flags);
82 void foffset_unlock_uio(struct file *fp, struct uio *uio, int flags);
85 foffset_get(struct file *fp)
88 return (foffset_lock(fp, FOF_NOLOCK));
91 typedef int fo_rdwr_t(struct file *fp, struct uio *uio,
92 struct ucred *active_cred, int flags,
94 typedef int fo_truncate_t(struct file *fp, off_t length,
95 struct ucred *active_cred, struct thread *td);
96 typedef int fo_ioctl_t(struct file *fp, u_long com, void *data,
97 struct ucred *active_cred, struct thread *td);
98 typedef int fo_poll_t(struct file *fp, int events,
99 struct ucred *active_cred, struct thread *td);
100 typedef int fo_kqfilter_t(struct file *fp, struct knote *kn);
101 typedef int fo_stat_t(struct file *fp, struct stat *sb,
102 struct ucred *active_cred, struct thread *td);
103 typedef int fo_close_t(struct file *fp, struct thread *td);
104 typedef int fo_chmod_t(struct file *fp, mode_t mode,
105 struct ucred *active_cred, struct thread *td);
106 typedef int fo_chown_t(struct file *fp, uid_t uid, gid_t gid,
107 struct ucred *active_cred, struct thread *td);
108 typedef int fo_sendfile_t(struct file *fp, int sockfd, struct uio *hdr_uio,
109 struct uio *trl_uio, off_t offset, size_t nbytes,
110 off_t *sent, int flags, int kflags, struct thread *td);
111 typedef int fo_seek_t(struct file *fp, off_t offset, int whence,
113 typedef int fo_flags_t;
118 fo_truncate_t *fo_truncate;
119 fo_ioctl_t *fo_ioctl;
121 fo_kqfilter_t *fo_kqfilter;
123 fo_close_t *fo_close;
124 fo_chmod_t *fo_chmod;
125 fo_chown_t *fo_chown;
126 fo_sendfile_t *fo_sendfile;
128 fo_flags_t fo_flags; /* DFLAG_* below */
131 #define DFLAG_PASSABLE 0x01 /* may be passed via unix sockets. */
132 #define DFLAG_SEEKABLE 0x02 /* seekable / nonsequential */
135 #if defined(_KERNEL) || defined(_WANT_FILE)
137 * Kernel descriptor table.
138 * One entry for each open kernel vnode and socket.
140 * Below is the list of locks that protects members in struct file.
142 * (f) protected with mtx_lock(mtx_pool_find(fp))
147 struct fadvise_info {
148 int fa_advice; /* (f) FADV_* type. */
149 off_t fa_start; /* (f) Region start. */
150 off_t fa_end; /* (f) Region end. */
151 off_t fa_prevstart; /* (f) Previous NOREUSE start. */
152 off_t fa_prevend; /* (f) Previous NOREUSE end. */
156 void *f_data; /* file descriptor specific data */
157 struct fileops *f_ops; /* File operations */
158 struct ucred *f_cred; /* associated credentials. */
159 struct vnode *f_vnode; /* NULL or applicable vnode */
160 short f_type; /* descriptor type */
161 short f_vnread_flags; /* (f) Sleep lock for f_offset */
162 volatile u_int f_flag; /* see fcntl.h */
163 volatile u_int f_count; /* reference count */
165 * DTYPE_VNODE specific fields.
167 int f_seqcount; /* Count of sequential accesses. */
168 off_t f_nextoff; /* next expected read/write offset. */
170 struct cdev_privdata *fvn_cdevpriv;
171 /* (d) Private data for the cdev. */
172 struct fadvise_info *fvn_advice;
175 * DFLAG_SEEKABLE specific fields
179 * Mandatory Access control information.
181 void *f_label; /* Place-holder for MAC label. */
184 #define f_cdevpriv f_vnun.fvn_cdevpriv
185 #define f_advice f_vnun.fvn_advice
187 #define FOFFSET_LOCKED 0x1
188 #define FOFFSET_LOCK_WAITING 0x2
189 #define FDEVFS_VNODE 0x4
191 #endif /* _KERNEL || _WANT_FILE */
194 * Userland version of struct file, for sysctl
197 size_t xf_size; /* size of struct xfile */
198 pid_t xf_pid; /* owning process */
199 uid_t xf_uid; /* effective uid of owning process */
200 int xf_fd; /* descriptor number */
201 void *xf_file; /* address of struct file */
202 short xf_type; /* descriptor type */
203 int xf_count; /* reference count */
204 int xf_msgcount; /* references from message queue */
205 off_t xf_offset; /* file offset */
206 void *xf_data; /* file descriptor specific data */
207 void *xf_vnode; /* vnode pointer */
208 u_int xf_flag; /* flags (see fcntl.h) */
213 extern struct fileops vnops;
214 extern struct fileops badfileops;
215 extern struct fileops socketops;
216 extern int maxfiles; /* kernel limit on number of open files */
217 extern int maxfilesperproc; /* per process limit on number of open files */
218 extern volatile int openfiles; /* actual number of open files */
220 int fget(struct thread *td, int fd, cap_rights_t *rightsp, struct file **fpp);
221 int fget_mmap(struct thread *td, int fd, cap_rights_t *rightsp,
222 u_char *maxprotp, struct file **fpp);
223 int fget_read(struct thread *td, int fd, cap_rights_t *rightsp,
225 int fget_write(struct thread *td, int fd, cap_rights_t *rightsp,
227 int _fdrop(struct file *fp, struct thread *td);
230 * The socket operations are used a couple of places.
231 * XXX: This is wrong, they should go through the operations vector for
232 * XXX: sockets instead of going directly for the individual functions. /phk
236 fo_truncate_t soo_truncate;
237 fo_ioctl_t soo_ioctl;
239 fo_kqfilter_t soo_kqfilter;
241 fo_close_t soo_close;
243 fo_chmod_t invfo_chmod;
244 fo_chown_t invfo_chown;
245 fo_sendfile_t invfo_sendfile;
247 fo_sendfile_t vn_sendfile;
250 void finit(struct file *, u_int, short, void *, struct fileops *);
251 int fgetvp(struct thread *td, int fd, cap_rights_t *rightsp,
253 int fgetvp_exec(struct thread *td, int fd, cap_rights_t *rightsp,
255 int fgetvp_rights(struct thread *td, int fd, cap_rights_t *needrightsp,
256 struct filecaps *havecaps, struct vnode **vpp);
257 int fgetvp_read(struct thread *td, int fd, cap_rights_t *rightsp,
259 int fgetvp_write(struct thread *td, int fd, cap_rights_t *rightsp,
262 int fgetsock(struct thread *td, int fd, cap_rights_t *rightsp,
263 struct socket **spp, u_int *fflagp);
264 void fputsock(struct socket *sp);
274 (refcount_acquire(&(fp)->f_count))
275 #define fdrop(fp, td) \
276 (refcount_release(&(fp)->f_count) ? _fdrop((fp), (td)) : _fnoop())
278 static __inline fo_rdwr_t fo_read;
279 static __inline fo_rdwr_t fo_write;
280 static __inline fo_truncate_t fo_truncate;
281 static __inline fo_ioctl_t fo_ioctl;
282 static __inline fo_poll_t fo_poll;
283 static __inline fo_kqfilter_t fo_kqfilter;
284 static __inline fo_stat_t fo_stat;
285 static __inline fo_close_t fo_close;
286 static __inline fo_chmod_t fo_chmod;
287 static __inline fo_chown_t fo_chown;
288 static __inline fo_sendfile_t fo_sendfile;
291 fo_read(struct file *fp, struct uio *uio, struct ucred *active_cred,
292 int flags, struct thread *td)
295 return ((*fp->f_ops->fo_read)(fp, uio, active_cred, flags, td));
299 fo_write(struct file *fp, struct uio *uio, struct ucred *active_cred,
300 int flags, struct thread *td)
303 return ((*fp->f_ops->fo_write)(fp, uio, active_cred, flags, td));
307 fo_truncate(struct file *fp, off_t length, struct ucred *active_cred,
311 return ((*fp->f_ops->fo_truncate)(fp, length, active_cred, td));
315 fo_ioctl(struct file *fp, u_long com, void *data, struct ucred *active_cred,
319 return ((*fp->f_ops->fo_ioctl)(fp, com, data, active_cred, td));
323 fo_poll(struct file *fp, int events, struct ucred *active_cred,
327 return ((*fp->f_ops->fo_poll)(fp, events, active_cred, td));
331 fo_stat(struct file *fp, struct stat *sb, struct ucred *active_cred,
335 return ((*fp->f_ops->fo_stat)(fp, sb, active_cred, td));
339 fo_close(struct file *fp, struct thread *td)
342 return ((*fp->f_ops->fo_close)(fp, td));
346 fo_kqfilter(struct file *fp, struct knote *kn)
349 return ((*fp->f_ops->fo_kqfilter)(fp, kn));
353 fo_chmod(struct file *fp, mode_t mode, struct ucred *active_cred,
357 return ((*fp->f_ops->fo_chmod)(fp, mode, active_cred, td));
361 fo_chown(struct file *fp, uid_t uid, gid_t gid, struct ucred *active_cred,
365 return ((*fp->f_ops->fo_chown)(fp, uid, gid, active_cred, td));
369 fo_sendfile(struct file *fp, int sockfd, struct uio *hdr_uio,
370 struct uio *trl_uio, off_t offset, size_t nbytes, off_t *sent, int flags,
371 int kflags, struct thread *td)
374 return ((*fp->f_ops->fo_sendfile)(fp, sockfd, hdr_uio, trl_uio, offset,
375 nbytes, sent, flags, kflags, td));
379 fo_seek(struct file *fp, off_t offset, int whence, struct thread *td)
382 return ((*fp->f_ops->fo_seek)(fp, offset, whence, td));
387 #endif /* !SYS_FILE_H */