sys/sys/file.h

   1 /*
   2  * Copyright (c) 1982, 1986, 1989, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  *      @(#)file.h      8.3 (Berkeley) 1/9/95
  30  * $FreeBSD: src/sys/sys/file.h,v 1.22.2.7 2002/11/21 23:39:24 sam Exp $
  31  */
  32
  33 #ifndef _SYS_FILE_H_
  34 #define _SYS_FILE_H_
  35
  36 #ifndef _SYS_TYPES_H_
  37 #include <sys/types.h>
  38 #endif
  39 #ifndef _SYS_FCNTL_H_
  40 #include <sys/fcntl.h>
  41 #endif
  42 #ifndef _SYS_UNISTD_H_
  43 #include <sys/unistd.h>
  44 #endif
  45
  46 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES)
  47
  48 #ifndef _SYS_EVENT_H_
  49 #include <sys/event.h>
  50 #endif
  51 #ifndef _SYS_QUEUE_H_
  52 #include <sys/queue.h>
  53 #endif
  54 #ifndef _SYS_SPINLOCK_H_
  55 #include <sys/spinlock.h>
  56 #endif
  57 #ifndef _SYS_NAMECACHE_H_
  58 #include <sys/namecache.h>
  59 #endif
  60 #ifndef _SYS__UIO_H_
  61 #include <sys/_uio.h>
  62 #endif
  63
  64 struct stat;
  65 struct proc;
  66 struct thread;
  67 struct uio;
  68 struct knote;
  69 struct file;
  70 struct ucred;
  71 struct vnode;
  72 struct lwkt_port;
  73 struct namecache;
  74 struct sysmsg;
  75
  76 struct  fileops {
  77         int (*fo_read)  (struct file *fp, struct uio *uio,
  78                          struct ucred *cred, int flags);
  79         int (*fo_write) (struct file *fp, struct uio *uio,
  80                          struct ucred *cred, int flags);
  81         int (*fo_ioctl) (struct file *fp, u_long com, caddr_t data,
  82                          struct ucred *cred, struct sysmsg *msg);
  83         int (*fo_kqfilter)(struct file *fp, struct knote *kn);
  84         int (*fo_stat)  (struct file *fp, struct stat *sb,
  85                          struct ucred *cred);
  86         int (*fo_close) (struct file *fp);
  87         int (*fo_shutdown)(struct file *fp, int how);
  88 };
  89
  90 /*
  91  * Kernel descriptor table - One entry for each open kernel vnode and socket.
  92  *
  93  * (A) - (filehead_spin) - descriptor subsystems only (kern/kern_descrip.c)
  94  * (U) - (unp_spin)      - uipc subsystems only (kern/uipc_usrreq.c)
  95  * (ro)- these fields may be read without holding a spinlock as long as you
  96  *       have (or know) that the reference to the fp is going to stay put.
  97  * ?   - remaining fields have to be spinlocked
  98  */
  99 struct file {
 100         LIST_ENTRY(file) f_list;/* (A) list of active files */
 101         short   f_FILLER3;
 102         short   f_type;         /* (ro) descriptor type */
 103         u_int   f_flag;         /* see fcntl.h */
 104         struct  ucred *f_cred;  /* (ro) creds associated with descriptor */
 105         struct  fileops *f_ops; /* (ro) operations vector */
 106         int     f_seqcount;     /*
 107                                  * count of sequential accesses -- cleared
 108                                  * by most seek operations.
 109                                  */
 110         off_t   f_nextoff;      /*
 111                                  * offset of next expected read or write
 112                                  */
 113         off_t   f_offset;
 114         void   *f_data;         /* vnode, pipe, socket, or kqueue */
 115         void   *f_data1;        /* devfs per-file data */
 116         int     f_count;        /* reference count */
 117         int     f_msgcount;     /* (U) reference count from message queue */
 118         struct nchandle f_nchandle; /* namecache reference */
 119         struct spinlock f_spin; /* NOT USED */
 120         struct klist    f_klist;/* knotes attached to fp/kq */
 121         void   *private_data;   /* Linux (drm) per-file data */
 122 };
 123
 124 #define DTYPE_VNODE     1       /* file */
 125 #define DTYPE_SOCKET    2       /* communications endpoint */
 126 #define DTYPE_PIPE      3       /* pipe */
 127 #define DTYPE_FIFO      4       /* fifo (named pipe) */
 128 #define DTYPE_KQUEUE    5       /* event queue */
 129 #define DTYPE_CRYPTO    6       /* crypto */
 130 #define DTYPE_MQUEUE    7       /* message queue */
 131 #define DTYPE_DMABUF    8       /* DRM DMA buffer */
 132
 133 LIST_HEAD(filelist, file);
 134
 135 #endif
 136
 137 #ifdef _KERNEL
 138
 139 void fhold(struct file *);
 140 int fdrop(struct file *);
 141 int checkfdclosed(thread_t, struct filedesc *, int, struct file *, int);
 142 int fp_open(const char *, int, int, struct file **);
 143 int fp_vpopen(struct vnode *, int, struct file **);
 144 int fp_pread(struct file *, void *, size_t, off_t, ssize_t *, enum uio_seg);
 145 int fp_pwrite(struct file *, void *, size_t, off_t, ssize_t *, enum uio_seg);
 146 int fp_read(struct file *, void *, size_t, ssize_t *, int, enum uio_seg);
 147 int fp_write(struct file *, void *, size_t, ssize_t *, enum uio_seg);
 148 int fp_stat(struct file *, struct stat *);
 149 int fp_mmap(void *, size_t, int, int, struct file *, off_t, void **);
 150
 151 int nofo_shutdown(struct file *, int);
 152
 153 int fp_close(struct file *);
 154 int fp_shutdown(struct file *, int);
 155
 156 extern struct fileops vnode_fileops;
 157 extern struct fileops specvnode_fileops;
 158 extern struct fileops badfileops;
 159 extern int maxfiles;            /* kernel limit on number of open files */
 160 extern int maxfilesrootres;     /* descriptors reserved for root use */
 161 extern int minfilesperproc;     /* minimum (safety) open files per proc */
 162 extern int maxfilesperproc;     /* per process limit on number of open files */
 163 extern int maxfilesperuser;     /* per user limit on number of open files */
 164
 165 /* Commonly used fileops */
 166 int badfo_readwrite(struct file *fp, struct uio *uio,
 167                     struct ucred *cred, int flags);
 168 int badfo_ioctl(struct file *fp, u_long com, caddr_t data,
 169                 struct ucred *cred, struct sysmsg *msg);
 170 int badfo_kqfilter(struct file *fp, struct knote *kn);
 171 int badfo_stat(struct file *fp, struct stat *sb, struct ucred *cred);
 172 int badfo_close(struct file *fp);
 173 int badfo_shutdown(struct file *fp, int how);
 174
 175 #endif /* _KERNEL */
 176
 177 #endif /* !SYS_FILE_H */