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 1.1.6.2 2007/04/20 20:26:04 bouyer 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  * 3. All advertising materials mentioning features or use of this software
   20  *    must display the following acknowledgement:
   21  *      This product includes software developed by the NetBSD
   22  *      Foundation, Inc. and its contributors.
   23  * 4. Neither the name of The NetBSD Foundation nor the names of its
   24  *    contributors may be used to endorse or promote products derived
   25  *    from this software without specific prior written permission.
   26  *
   27  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
   28  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
   29  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   30  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
   31  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
   32  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
   33  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   34  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   35  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
   36  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   37  * POSSIBILITY OF SUCH DAMAGE.
   38  */
   39 
   40 #ifndef _LINUX_STATFS_H
   41 #define _LINUX_STATFS_H
   42 
   43 static void bsd_to_linux_statfs __P((const struct statvfs *,
   44     struct linux_statfs *));
   45 
   46 /*
   47  * Convert NetBSD statvfs structure to Linux statfs structure.
   48  * Linux doesn't have f_flag, and we can't set f_frsize due
   49  * to glibc statvfs() bug (see below).
   50  */
   51 static void
   52 bsd_to_linux_statfs(bsp, lsp)
   53         const struct statvfs *bsp;
   54         struct linux_statfs *lsp;
   55 {
   56         int i;
   57 
   58         for (i = 0; i < linux_fstypes_cnt; i++) {
   59                 if (strcmp(bsp->f_fstypename, linux_fstypes[i].bsd) == 0) {
   60                         lsp->l_ftype = linux_fstypes[i].linux;
   61                         break;
   62                 }
   63         }
   64 
   65         if (i == linux_fstypes_cnt) {
   66                 lsp->l_ftype = LINUX_DEFAULT_SUPER_MAGIC;
   67         }
   68 
   69         /*
   70          * The sizes are expressed in number of blocks. The block
   71          * size used for the size is f_frsize for POSIX-compliant
   72          * statvfs. Linux statfs uses f_bsize as the block size
   73          * (f_frsize used to not be available in Linux struct statfs).
   74          * However, glibc 2.3.3 statvfs() wrapper fails to adjust the block
   75          * counts for different f_frsize if f_frsize is provided by the kernel.
   76          * POSIX conforming apps thus get wrong size if f_frsize
   77          * is different to f_bsize. Thus, we just pretend we don't
   78          * support f_frsize.
   79          */
   80 
   81         lsp->l_fbsize = bsp->f_frsize;
   82         lsp->l_ffrsize = 0;                     /* compat */
   83         lsp->l_fblocks = bsp->f_blocks;
   84         lsp->l_fbfree = bsp->f_bfree;
   85         lsp->l_fbavail = bsp->f_bavail;
   86         lsp->l_ffiles = bsp->f_files;
   87         lsp->l_fffree = bsp->f_ffree;
   88         /* Linux sets the fsid to 0..., we don't */
   89         lsp->l_ffsid.val[0] = bsp->f_fsidx.__fsid_val[0];
   90         lsp->l_ffsid.val[1] = bsp->f_fsidx.__fsid_val[1];
   91         lsp->l_fnamelen = bsp->f_namemax;
   92         (void)memset(lsp->l_fspare, 0, sizeof(lsp->l_fspare));
   93 }
   94 
   95 #endif /* !_LINUX_STATFS_H */

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