FreeBSD/Linux Kernel Cross Reference
sys/sys/file.h

     /*-
      * Copyright (c) 1982, 1986, 1989, 1993
      *      The Regents of the University of California.  All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
      * 1. Redistributions of source code must retain the above copyright
      *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     * 4. Neither the name of the University nor the names of its contributors
     *    may be used to endorse or promote products derived from this software
     *    without specific prior written permission.
     *
     * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     *
     *      @(#)file.h      8.3 (Berkeley) 1/9/95
     * $FreeBSD: releng/8.3/sys/sys/file.h 229725 2012-01-06 19:32:39Z jhb $
     */
    
    #ifndef _SYS_FILE_H_
    #define _SYS_FILE_H_
    
    #ifndef _KERNEL
    #include <sys/types.h> /* XXX */
    #include <sys/fcntl.h>
    #include <sys/unistd.h>
    #else
    #include <sys/queue.h>
    #include <sys/refcount.h>
    #include <sys/_lock.h>
    #include <sys/_mutex.h>
    
    struct stat;
    struct thread;
    struct uio;
    struct knote;
    struct vnode;
    struct socket;
    
    
    #endif /* _KERNEL */
    
    #define DTYPE_VNODE     1       /* file */
    #define DTYPE_SOCKET    2       /* communications endpoint */
    #define DTYPE_PIPE      3       /* pipe */
    #define DTYPE_FIFO      4       /* fifo (named pipe) */
    #define DTYPE_KQUEUE    5       /* event queue */
    #define DTYPE_CRYPTO    6       /* crypto */
    #define DTYPE_MQUEUE    7       /* posix message queue */
    #define DTYPE_SHM       8       /* swap-backed shared memory */
    #define DTYPE_SEM       9       /* posix semaphore */
    #define DTYPE_PTS       10      /* pseudo teletype master device */
    
    #ifdef _KERNEL
    
    struct file;
    struct ucred;
    
    typedef int fo_rdwr_t(struct file *fp, struct uio *uio,
                        struct ucred *active_cred, int flags,
                        struct thread *td);
    #define FOF_OFFSET      1       /* Use the offset in uio argument */
    typedef int fo_truncate_t(struct file *fp, off_t length,
                        struct ucred *active_cred, struct thread *td);
    typedef int fo_ioctl_t(struct file *fp, u_long com, void *data,
                        struct ucred *active_cred, struct thread *td);
    typedef int fo_poll_t(struct file *fp, int events,
                        struct ucred *active_cred, struct thread *td);
    typedef int fo_kqfilter_t(struct file *fp, struct knote *kn);
    typedef int fo_stat_t(struct file *fp, struct stat *sb,
                        struct ucred *active_cred, struct thread *td);
    typedef int fo_close_t(struct file *fp, struct thread *td);
    typedef int fo_flags_t;
    
    struct fileops {
            fo_rdwr_t       *fo_read;
            fo_rdwr_t       *fo_write;
            fo_truncate_t   *fo_truncate;
            fo_ioctl_t      *fo_ioctl;
            fo_poll_t       *fo_poll;
            fo_kqfilter_t   *fo_kqfilter;
            fo_stat_t       *fo_stat;
            fo_close_t      *fo_close;
            fo_flags_t      fo_flags;       /* DFLAG_* below */
    };
    
   #define DFLAG_PASSABLE  0x01    /* may be passed via unix sockets. */
   #define DFLAG_SEEKABLE  0x02    /* seekable / nonsequential */
   #endif /* _KERNEL */
   
   #if defined(_KERNEL) || defined(_WANT_FILE)
   /*
    * Kernel descriptor table.
    * One entry for each open kernel vnode and socket.
    *
    * Below is the list of locks that protects members in struct file.
    *
    * (f) protected with mtx_lock(mtx_pool_find(fp))
    * (d) cdevpriv_mtx
    * none not locked
    */
   
   struct fadvise_info {
           int             fa_advice;      /* (f) FADV_* type. */
           off_t           fa_start;       /* (f) Region start. */
           off_t           fa_end;         /* (f) Region end. */
   };
   
   struct file {
           void            *f_data;        /* file descriptor specific data */
           struct fileops  *f_ops;         /* File operations */
           struct ucred    *f_cred;        /* associated credentials. */
           struct vnode    *f_vnode;       /* NULL or applicable vnode */
           short           f_type;         /* descriptor type */
           short           f_vnread_flags; /* (f) Sleep lock for f_offset */
           volatile u_int  f_flag;         /* see fcntl.h */
           volatile u_int  f_count;        /* reference count */
           /*
            *  DTYPE_VNODE specific fields.
            */
           int             f_seqcount;     /* Count of sequential accesses. */
           off_t           f_nextoff;      /* next expected read/write offset. */
           union {
                   struct cdev_privdata *fvn_cdevpriv;
                                           /* (d) Private data for the cdev. */
                   struct fadvise_info *fvn_advice;
           } f_vnun;
           /*
            *  DFLAG_SEEKABLE specific fields
            */
           off_t           f_offset;
           /*
            * Mandatory Access control information.
            */
           void            *f_label;       /* Place-holder for MAC label. */
   };
   
   #define f_cdevpriv      f_vnun.fvn_cdevpriv
   #define f_advice        f_vnun.fvn_advice
   
   #define FOFFSET_LOCKED       0x1
   #define FOFFSET_LOCK_WAITING 0x2                 
   
   #endif /* _KERNEL || _WANT_FILE */
   
   /*
    * Userland version of struct file, for sysctl
    */
   struct xfile {
           size_t  xf_size;        /* size of struct xfile */
           pid_t   xf_pid;         /* owning process */
           uid_t   xf_uid;         /* effective uid of owning process */
           int     xf_fd;          /* descriptor number */
           void    *xf_file;       /* address of struct file */
           short   xf_type;        /* descriptor type */
           int     xf_count;       /* reference count */
           int     xf_msgcount;    /* references from message queue */
           off_t   xf_offset;      /* file offset */
           void    *xf_data;       /* file descriptor specific data */
           void    *xf_vnode;      /* vnode pointer */
           u_int   xf_flag;        /* flags (see fcntl.h) */
   };
   
   #ifdef _KERNEL
   
   #ifdef MALLOC_DECLARE
   MALLOC_DECLARE(M_FILE);
   #endif
   
   extern struct fileops vnops;
   extern struct fileops badfileops;
   extern struct fileops socketops;
   extern int maxfiles;            /* kernel limit on number of open files */
   extern int maxfilesperproc;     /* per process limit on number of open files */
   extern volatile int openfiles;  /* actual number of open files */
   
   int fget(struct thread *td, int fd, struct file **fpp);
   int fget_read(struct thread *td, int fd, struct file **fpp);
   int fget_write(struct thread *td, int fd, struct file **fpp);
   int _fdrop(struct file *fp, struct thread *td);
   
   /*
    * The socket operations are used a couple of places.
    * XXX: This is wrong, they should go through the operations vector for
    * XXX: sockets instead of going directly for the individual functions. /phk
    */
   fo_rdwr_t       soo_read;
   fo_rdwr_t       soo_write;
   fo_truncate_t   soo_truncate;
   fo_ioctl_t      soo_ioctl;
   fo_poll_t       soo_poll;
   fo_kqfilter_t   soo_kqfilter;
   fo_stat_t       soo_stat;
   fo_close_t      soo_close;
   
   void finit(struct file *, u_int, short, void *, struct fileops *);
   int fgetvp(struct thread *td, int fd, struct vnode **vpp);
   int fgetvp_read(struct thread *td, int fd, struct vnode **vpp);
   int fgetvp_write(struct thread *td, int fd, struct vnode **vpp);
   
   int fgetsock(struct thread *td, int fd, struct socket **spp, u_int *fflagp);
   void fputsock(struct socket *sp);
   
   #define fhold(fp)                                                       \
           (refcount_acquire(&(fp)->f_count))
   #define fdrop(fp, td)                                                   \
           (refcount_release(&(fp)->f_count) ? _fdrop((fp), (td)) : 0)
   
   static __inline fo_rdwr_t       fo_read;
   static __inline fo_rdwr_t       fo_write;
   static __inline fo_truncate_t   fo_truncate;
   static __inline fo_ioctl_t      fo_ioctl;
   static __inline fo_poll_t       fo_poll;
   static __inline fo_kqfilter_t   fo_kqfilter;
   static __inline fo_stat_t       fo_stat;
   static __inline fo_close_t      fo_close;
   
   static __inline int
   fo_read(fp, uio, active_cred, flags, td)
           struct file *fp;
           struct uio *uio;
           struct ucred *active_cred;
           int flags;
           struct thread *td;
   {
   
           return ((*fp->f_ops->fo_read)(fp, uio, active_cred, flags, td));
   }
   
   static __inline int
   fo_write(fp, uio, active_cred, flags, td)
           struct file *fp;
           struct uio *uio;
           struct ucred *active_cred;
           int flags;
           struct thread *td;
   {
   
           return ((*fp->f_ops->fo_write)(fp, uio, active_cred, flags, td));
   }
   
   static __inline int
   fo_truncate(fp, length, active_cred, td)
           struct file *fp;
           off_t length;
           struct ucred *active_cred;
           struct thread *td;
   {
   
           return ((*fp->f_ops->fo_truncate)(fp, length, active_cred, td));
   }
   
   static __inline int
   fo_ioctl(fp, com, data, active_cred, td)
           struct file *fp;
           u_long com;
           void *data;
           struct ucred *active_cred;
           struct thread *td;
   {
   
           return ((*fp->f_ops->fo_ioctl)(fp, com, data, active_cred, td));
   }
   
   static __inline int
   fo_poll(fp, events, active_cred, td)
           struct file *fp;
           int events;
           struct ucred *active_cred;
           struct thread *td;
   {
   
           return ((*fp->f_ops->fo_poll)(fp, events, active_cred, td));
   }
   
   static __inline int
   fo_stat(fp, sb, active_cred, td)
           struct file *fp;
           struct stat *sb;
           struct ucred *active_cred;
           struct thread *td;
   {
   
           return ((*fp->f_ops->fo_stat)(fp, sb, active_cred, td));
   }
   
   static __inline int
   fo_close(fp, td)
           struct file *fp;
           struct thread *td;
   {
   
           return ((*fp->f_ops->fo_close)(fp, td));
   }
   
   static __inline int
   fo_kqfilter(fp, kn)
           struct file *fp;
           struct knote *kn;
   {
   
           return ((*fp->f_ops->fo_kqfilter)(fp, kn));
   }
   
   #endif /* _KERNEL */
   
   #endif /* !SYS_FILE_H */

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