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. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  *      @(#)file.h      8.3 (Berkeley) 1/9/95
  34  * $FreeBSD: src/sys/sys/file.h,v 1.22.2.7 2002/11/21 23:39:24 sam Exp $
  35  * $DragonFly: src/sys/sys/file.h,v 1.25 2007/01/12 06:06:58 dillon Exp $
  36  */
  37
  38 #ifndef _SYS_FILE_H_
  39 #define _SYS_FILE_H_
  40
  41 #ifndef _SYS_TYPES_H_
  42 #include <sys/types.h>
  43 #endif
  44 #ifndef _SYS_FCNTL_H_
  45 #include <sys/fcntl.h>
  46 #endif
  47 #ifndef _SYS_UNISTD_H_
  48 #include <sys/unistd.h>
  49 #endif
  50
  51 #if defined(_KERNEL) || defined(_KERNEL_STRUCTURES)
  52
  53 #ifndef _SYS_QUEUE_H_
  54 #include <sys/queue.h>
  55 #endif
  56 #ifndef _SYS_SPINLOCK_H_
  57 #include <sys/spinlock.h>
  58 #endif
  59 #ifndef _SYS_NAMECACHE_H_
  60 #include <sys/namecache.h>
  61 #endif
  62 #ifndef _SYS_UIO_H_
  63 #include <sys/uio.h>
  64 #endif
  65
  66 struct stat;
  67 struct proc;
  68 struct thread;
  69 struct uio;
  70 struct knote;
  71 struct file;
  72 struct ucred;
  73 struct vnode;
  74 struct lwkt_port;
  75 struct namecache;
  76
  77 struct  fileops {
  78         int (*fo_read)  (struct file *fp, struct uio *uio,
  79                          struct ucred *cred, int flags);
  80         int (*fo_write) (struct file *fp, struct uio *uio,
  81                          struct ucred *cred, int flags);
  82         int (*fo_ioctl) (struct file *fp, u_long com, caddr_t data,
  83                          struct ucred *cred);
  84         int (*fo_poll)  (struct file *fp, int events,
  85                          struct ucred *cred);
  86         int (*fo_kqfilter)(struct file *fp, struct knote *kn);
  87         int (*fo_stat)  (struct file *fp, struct stat *sb,
  88                          struct ucred *cred);
  89         int (*fo_close) (struct file *fp);
  90         int (*fo_shutdown)(struct file *fp, int how);
  91 };
  92
  93 /*
  94  * Kernel descriptor table - One entry for each open kernel vnode and socket.
  95  *
  96  * (A) - (filehead_spin) - descriptor subsystems only (kern/kern_descrip.c)
  97  * (U) - (unp_spin)      - uipc subsystems only (kern/uipc_usrreq.c)
  98  * (ro)- these fields may be read without holding a spinlock as long as you
  99  *       have (or know) that the reference to the fp is going to stay put.
 100  * ?   - remaining fields have to be spinlocked
 101  */
 102 struct file {
 103         LIST_ENTRY(file) f_list;/* (A) list of active files */
 104         short   f_FILLER3;
 105         short   f_type;         /* (ro) descriptor type */
 106         u_int   f_flag;         /* see fcntl.h */
 107         struct  ucred *f_cred;  /* (ro) creds associated with descriptor */
 108         struct  fileops *f_ops; /* (ro) operations vector */
 109         int     f_seqcount;     /*
 110                                  * count of sequential accesses -- cleared
 111                                  * by most seek operations.
 112                                  */
 113         off_t   f_nextoff;      /*
 114                                  * offset of next expected read or write
 115                                  */
 116         off_t   f_offset;
 117         void   *f_data;         /* vnode, pipe, socket, or kqueue */
 118         int     f_count;        /* reference count */
 119         int     f_msgcount;     /* (U) reference count from message queue */
 120         struct nchandle f_nchandle; /* namecache reference */
 121         struct spinlock f_spin;
 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_SYSLINK   7       /* syslink */
 131
 132 LIST_HEAD(filelist, file);
 133
 134 #endif
 135
 136 #ifdef _KERNEL
 137
 138 #ifdef MALLOC_DECLARE
 139 MALLOC_DECLARE(M_FILE);
 140 #endif
 141
 142 extern void fhold(struct file *fp);
 143 extern int fdrop (struct file *fp);
 144 extern int fp_open(const char *path, int flags, int mode, struct file **fpp);
 145 extern int fp_vpopen(struct vnode *vp, int flags, struct file **fpp);
 146 extern int fp_pread(struct file *fp, void *buf, size_t nbytes, off_t offset, ssize_t *res, enum uio_seg);
 147 extern int fp_pwrite(struct file *fp, void *buf, size_t nbytes, off_t offset, ssize_t *res, enum uio_seg);
 148 extern int fp_read(struct file *fp, void *buf, size_t nbytes, ssize_t *res, int all, enum uio_seg);
 149 extern int fp_write(struct file *fp, void *buf, size_t nbytes, ssize_t *res, enum uio_seg);
 150 extern int fp_stat(struct file *fp, struct stat *ub);
 151 extern int fp_mmap(void *addr, size_t size, int prot, int flags, struct file *fp, off_t pos, void **resp);
 152
 153 extern int nofo_shutdown(struct file *fp, int how);
 154
 155 extern int fp_close(struct file *fp);
 156 extern int fp_shutdown(struct file *fp, int how);
 157
 158 extern struct fileops vnode_fileops;
 159 extern struct fileops specvnode_fileops;
 160 extern struct fileops badfileops;
 161 extern int maxfiles;            /* kernel limit on number of open files */
 162 extern int maxfilesrootres;     /* descriptors reserved for root use */
 163 extern int maxfilesperproc;     /* per process limit on number of open files */
 164
 165 #endif /* _KERNEL */
 166
 167 #endif /* !SYS_FILE_H */