FreeBSD/Linux Kernel Cross Reference
sys/fs/fuse/fuse_file.h

     /*
      * Copyright (c) 2007-2009 Google Inc. and Amit Singh
      * All rights reserved.
      * 
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions are
      * met:
      * 
      * * Redistributions of source code must retain the above copyright
     *   notice, this list of conditions and the following disclaimer.
     * * 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.
     * * Neither the name of Google Inc. 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 COPYRIGHT HOLDERS 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 COPYRIGHT
     * OWNER 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.
     * 
     * Copyright (C) 2005 Csaba Henk.
     * 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.
     * 
     * THIS SOFTWARE IS PROVIDED BY AUTHOR 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 AUTHOR 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.
     *
     * $FreeBSD$
     */
    
    #ifndef _FUSE_FILE_H_
    #define _FUSE_FILE_H_
    
    #include <sys/types.h>
    #include <sys/fcntl.h>
    #include <sys/stat.h>
    #include <sys/mman.h>
    #include <sys/vnode.h>
    
    typedef enum fufh_type {
        FUFH_INVALID = -1,
        FUFH_RDONLY  = 0,
        FUFH_WRONLY  = 1,
        FUFH_RDWR    = 2,
        FUFH_MAXTYPE = 3,
    } fufh_type_t;
    
    struct fuse_filehandle {
        uint64_t fh_id;
        fufh_type_t fh_type;
    };
    
    #define FUFH_IS_VALID(f)  ((f)->fh_type != FUFH_INVALID)
    
    static __inline__
    fufh_type_t
    fuse_filehandle_xlate_from_mmap(int fflags)
    {
        if (fflags & (PROT_READ | PROT_WRITE)) {
            return FUFH_RDWR;
        } else if (fflags & (PROT_WRITE)) {
            return FUFH_WRONLY;
        } else if ((fflags & PROT_READ) || (fflags & PROT_EXEC)) {
            return FUFH_RDONLY;
        } else {
            return FUFH_INVALID;
        }
    }
    
    static __inline__
    fufh_type_t
    fuse_filehandle_xlate_from_fflags(int fflags)
   {
       if ((fflags & FREAD) && (fflags & FWRITE)) {
           return FUFH_RDWR;
       } else if (fflags & (FWRITE)) {
           return FUFH_WRONLY;
       } else if (fflags & (FREAD)) {
           return FUFH_RDONLY;
       } else {
           panic("FUSE: What kind of a flag is this (%x)?", fflags);
       }
   }
   
   static __inline__
   int
   fuse_filehandle_xlate_to_oflags(fufh_type_t type)
   {
       int oflags = -1;
   
       switch (type) {
   
       case FUFH_RDONLY:
           oflags = O_RDONLY;
           break;
   
       case FUFH_WRONLY:
           oflags = O_WRONLY;
           break;
   
       case FUFH_RDWR:
           oflags = O_RDWR;
           break;
   
       default:
           break;
       }
   
       return oflags;
   }
   
   int fuse_filehandle_valid(struct vnode *vp, fufh_type_t fufh_type);
   fufh_type_t fuse_filehandle_validrw(struct vnode *vp, fufh_type_t fufh_type);
   int fuse_filehandle_get(struct vnode *vp, fufh_type_t fufh_type,
                           struct fuse_filehandle **fufhp);
   int fuse_filehandle_getrw(struct vnode *vp, fufh_type_t fufh_type,
                             struct fuse_filehandle **fufhp);
   
   void fuse_filehandle_init(struct vnode *vp, fufh_type_t fufh_type,
                             struct fuse_filehandle **fufhp, uint64_t fh_id);
   int fuse_filehandle_open(struct vnode *vp, fufh_type_t fufh_type,
                            struct fuse_filehandle **fufhp, struct thread *td,
                            struct ucred *cred);
   int fuse_filehandle_close(struct vnode *vp, fufh_type_t fufh_type,
                             struct thread *td, struct ucred *cred);
   
   #endif /* _FUSE_FILE_H_ */

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