sys/compat/linux/common/linux_statfs.h

   1 /*      $NetBSD: linux_statfs.h,v 1.3 2008/04/28 20:23:44 martin Exp $  */
   2
   3 /*-
   4  * Copyright (c) 1995, 1998, 1999 The NetBSD Foundation, Inc.
   5  * All rights reserved.
   6  *
   7  * This code is derived from software contributed to The NetBSD Foundation
   8  * by Frank van der Linden and Eric Haszlakiewicz; by Jason R. Thorpe
   9  * of the Numerical Aerospace Simulation Facility, NASA Ames Research Center.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions and the following disclaimer.
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in the
  18  *    documentation and/or other materials provided with the distribution.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  21  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  22  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  23  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  24  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  25  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  26  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  29  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  30  * POSSIBILITY OF SUCH DAMAGE.
  31  */
  32
  33 #ifndef _LINUX_STATFS_H
  34 #define _LINUX_STATFS_H
  35
  36 static void bsd_to_linux_statfs(const struct statvfs *,
  37     struct linux_statfs *);
  38
  39 /*
  40  * Convert NetBSD statvfs structure to Linux statfs structure.
  41  * Linux doesn't have f_flag, and we can't set f_frsize due
  42  * to glibc statvfs() bug (see below).
  43  */
  44 static void
  45 bsd_to_linux_statfs(const struct statvfs *bsp, struct linux_statfs *lsp)
  46 {
  47         int i;
  48
  49         for (i = 0; i < linux_fstypes_cnt; i++) {
  50                 if (strcmp(bsp->f_fstypename, linux_fstypes[i].bsd) == 0) {
  51                         lsp->l_ftype = linux_fstypes[i].linux;
  52                         break;
  53                 }
  54         }
  55
  56         if (i == linux_fstypes_cnt) {
  57                 lsp->l_ftype = LINUX_DEFAULT_SUPER_MAGIC;
  58         }
  59
  60         /*
  61          * The sizes are expressed in number of blocks. The block
  62          * size used for the size is f_frsize for POSIX-compliant
  63          * statvfs. Linux statfs uses f_bsize as the block size
  64          * (f_frsize used to not be available in Linux struct statfs).
  65          * However, glibc 2.3.3 statvfs() wrapper fails to adjust the block
  66          * counts for different f_frsize if f_frsize is provided by the kernel.
  67          * POSIX conforming apps thus get wrong size if f_frsize
  68          * is different to f_bsize. Thus, we just pretend we don't
  69          * support f_frsize.
  70          */
  71
  72         lsp->l_fbsize = bsp->f_frsize;
  73         lsp->l_ffrsize = 0;                     /* compat */
  74         lsp->l_fblocks = bsp->f_blocks;
  75         lsp->l_fbfree = bsp->f_bfree;
  76         lsp->l_fbavail = bsp->f_bavail;
  77         lsp->l_ffiles = bsp->f_files;
  78         lsp->l_fffree = bsp->f_ffree;
  79         /* Linux sets the fsid to 0..., we don't */
  80         lsp->l_ffsid.val[0] = bsp->f_fsidx.__fsid_val[0];
  81         lsp->l_ffsid.val[1] = bsp->f_fsidx.__fsid_val[1];
  82         lsp->l_fnamelen = bsp->f_namemax;
  83         (void)memset(lsp->l_fspare, 0, sizeof(lsp->l_fspare));
  84 }
  85
  86 #endif /* !_LINUX_STATFS_H */