The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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

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    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(bsp, lsp)
   46         const struct statvfs *bsp;
   47         struct linux_statfs *lsp;
   48 {
   49         int i;
   50 
   51         for (i = 0; i < linux_fstypes_cnt; i++) {
   52                 if (strcmp(bsp->f_fstypename, linux_fstypes[i].bsd) == 0) {
   53                         lsp->l_ftype = linux_fstypes[i].linux;
   54                         break;
   55                 }
   56         }
   57 
   58         if (i == linux_fstypes_cnt) {
   59                 lsp->l_ftype = LINUX_DEFAULT_SUPER_MAGIC;
   60         }
   61 
   62         /*
   63          * The sizes are expressed in number of blocks. The block
   64          * size used for the size is f_frsize for POSIX-compliant
   65          * statvfs. Linux statfs uses f_bsize as the block size
   66          * (f_frsize used to not be available in Linux struct statfs).
   67          * However, glibc 2.3.3 statvfs() wrapper fails to adjust the block
   68          * counts for different f_frsize if f_frsize is provided by the kernel.
   69          * POSIX conforming apps thus get wrong size if f_frsize
   70          * is different to f_bsize. Thus, we just pretend we don't
   71          * support f_frsize.
   72          */
   73 
   74         lsp->l_fbsize = bsp->f_frsize;
   75         lsp->l_ffrsize = 0;                     /* compat */
   76         lsp->l_fblocks = bsp->f_blocks;
   77         lsp->l_fbfree = bsp->f_bfree;
   78         lsp->l_fbavail = bsp->f_bavail;
   79         lsp->l_ffiles = bsp->f_files;
   80         lsp->l_fffree = bsp->f_ffree;
   81         /* Linux sets the fsid to 0..., we don't */
   82         lsp->l_ffsid.val[0] = bsp->f_fsidx.__fsid_val[0];
   83         lsp->l_ffsid.val[1] = bsp->f_fsidx.__fsid_val[1];
   84         lsp->l_fnamelen = bsp->f_namemax;
   85         (void)memset(lsp->l_fspare, 0, sizeof(lsp->l_fspare));
   86 }
   87 
   88 #endif /* !_LINUX_STATFS_H */

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