FreeBSD/Linux Kernel Cross Reference
sys/compat/linux/common/linux_statfs.h

     /*      $NetBSD: linux_statfs.h,v 1.7 2019/08/23 13:36:45 maxv Exp $    */
     
     /*-
      * Copyright (c) 1995, 1998, 1999 The NetBSD Foundation, Inc.
      * All rights reserved.
      *
      * This code is derived from software contributed to The NetBSD Foundation
      * by Frank van der Linden and Eric Haszlakiewicz; by Jason R. Thorpe
      * of the Numerical Aerospace Simulation Facility, NASA Ames Research Center.
     *
     * 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 THE NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
     */
    
    #ifndef _LINUX_STATFS_H
    #define _LINUX_STATFS_H
    
    static void __unused bsd_to_linux_statfs(const struct statvfs *,
        struct linux_statfs *);
    static void __unused bsd_to_linux_statfs64(const struct statvfs *,
        struct linux_statfs64 *);
    
    /*
     * Convert NetBSD statvfs structure to Linux statfs structure.
     * Linux doesn't have f_flag, and we can't set f_frsize due
     * to glibc statvfs() bug (see below).
     */
    static void __unused
    bsd_to_linux_statfs(const struct statvfs *bsp, struct linux_statfs *lsp)
    {
            int i;
    
            memset(lsp, 0, sizeof(*lsp));
    
            for (i = 0; i < linux_fstypes_cnt; i++) {
                    if (strcmp(bsp->f_fstypename, linux_fstypes[i].mty_bsd) == 0) {
                            lsp->l_ftype = linux_fstypes[i].mty_linux;
                            break;
                    }
            }
    
            if (i == linux_fstypes_cnt) {
                    lsp->l_ftype = LINUX_DEFAULT_SUPER_MAGIC;
            }
    
            /*
             * The sizes are expressed in number of blocks. The block
             * size used for the size is f_frsize for POSIX-compliant
             * statvfs. Linux statfs uses f_bsize as the block size
             * (f_frsize used to not be available in Linux struct statfs).
             * However, glibc 2.3.3 statvfs() wrapper fails to adjust the block
             * counts for different f_frsize if f_frsize is provided by the kernel.
             * POSIX conforming apps thus get wrong size if f_frsize
             * is different to f_bsize. Thus, we just pretend we don't
             * support f_frsize.
             */
    
            lsp->l_fbsize = bsp->f_frsize;
            lsp->l_ffrsize = 0;                     /* compat */
            lsp->l_fblocks = bsp->f_blocks;
            lsp->l_fbfree = bsp->f_bfree;
            lsp->l_fbavail = bsp->f_bavail;
            lsp->l_ffiles = bsp->f_files;
            lsp->l_fffree = bsp->f_ffree;
            /* Linux sets the fsid to 0..., we don't */
            lsp->l_ffsid.val[0] = bsp->f_fsidx.__fsid_val[0];
            lsp->l_ffsid.val[1] = bsp->f_fsidx.__fsid_val[1];
            lsp->l_fnamelen = bsp->f_namemax;
    }
    
    /*
     * Convert NetBSD statvfs structure to Linux statfs64 structure.
     * See comments in bsd_to_linux_statfs() for further background.
     * We can safely pass correct bsize and frsize here, since Linux glibc
     * statvfs() doesn't use statfs64().
     */
    static void __unused
    bsd_to_linux_statfs64(const struct statvfs *bsp, struct linux_statfs64 *lsp)
    {
            int i, div;
    
           memset(lsp, 0, sizeof(*lsp));
   
           for (i = 0; i < linux_fstypes_cnt; i++) {
                   if (strcmp(bsp->f_fstypename, linux_fstypes[i].mty_bsd) == 0) {
                           lsp->l_ftype = linux_fstypes[i].mty_linux;
                           break;
                   }
           }
   
           if (i == linux_fstypes_cnt) {
                   lsp->l_ftype = LINUX_DEFAULT_SUPER_MAGIC;
           }
   
           div = bsp->f_frsize ? (bsp->f_bsize / bsp->f_frsize) : 1;
           if (div == 0)
                   div = 1;
           lsp->l_fbsize = bsp->f_bsize;
           lsp->l_ffrsize = bsp->f_frsize;
           lsp->l_fblocks = bsp->f_blocks / div;
           lsp->l_fbfree = bsp->f_bfree / div;
           lsp->l_fbavail = bsp->f_bavail / div;
           lsp->l_ffiles = bsp->f_files;
           lsp->l_fffree = bsp->f_ffree / div;
           /* Linux sets the fsid to 0..., we don't */
           lsp->l_ffsid.val[0] = bsp->f_fsidx.__fsid_val[0];
           lsp->l_ffsid.val[1] = bsp->f_fsidx.__fsid_val[1];
           lsp->l_fnamelen = bsp->f_namemax;
   }
   
   #endif /* !_LINUX_STATFS_H */

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