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      1 /*	$NetBSD: linux_statfs.h,v 1.7 2019/08/23 13:36:45 maxv 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 __unused bsd_to_linux_statfs(const struct statvfs *,
     37     struct linux_statfs *);
     38 static void __unused bsd_to_linux_statfs64(const struct statvfs *,
     39     struct linux_statfs64 *);
     40 
     41 /*
     42  * Convert NetBSD statvfs structure to Linux statfs structure.
     43  * Linux doesn't have f_flag, and we can't set f_frsize due
     44  * to glibc statvfs() bug (see below).
     45  */
     46 static void __unused
     47 bsd_to_linux_statfs(const struct statvfs *bsp, struct linux_statfs *lsp)
     48 {
     49 	int i;
     50 
     51 	memset(lsp, 0, sizeof(*lsp));
     52 
     53 	for (i = 0; i < linux_fstypes_cnt; i++) {
     54 		if (strcmp(bsp->f_fstypename, linux_fstypes[i].mty_bsd) == 0) {
     55 			lsp->l_ftype = linux_fstypes[i].mty_linux;
     56 			break;
     57 		}
     58 	}
     59 
     60 	if (i == linux_fstypes_cnt) {
     61 		lsp->l_ftype = LINUX_DEFAULT_SUPER_MAGIC;
     62 	}
     63 
     64 	/*
     65 	 * The sizes are expressed in number of blocks. The block
     66 	 * size used for the size is f_frsize for POSIX-compliant
     67 	 * statvfs. Linux statfs uses f_bsize as the block size
     68 	 * (f_frsize used to not be available in Linux struct statfs).
     69 	 * However, glibc 2.3.3 statvfs() wrapper fails to adjust the block
     70 	 * counts for different f_frsize if f_frsize is provided by the kernel.
     71 	 * POSIX conforming apps thus get wrong size if f_frsize
     72 	 * is different to f_bsize. Thus, we just pretend we don't
     73 	 * support f_frsize.
     74 	 */
     75 
     76 	lsp->l_fbsize = bsp->f_frsize;
     77 	lsp->l_ffrsize = 0;			/* compat */
     78 	lsp->l_fblocks = bsp->f_blocks;
     79 	lsp->l_fbfree = bsp->f_bfree;
     80 	lsp->l_fbavail = bsp->f_bavail;
     81 	lsp->l_ffiles = bsp->f_files;
     82 	lsp->l_fffree = bsp->f_ffree;
     83 	/* Linux sets the fsid to 0..., we don't */
     84 	lsp->l_ffsid.val[0] = bsp->f_fsidx.__fsid_val[0];
     85 	lsp->l_ffsid.val[1] = bsp->f_fsidx.__fsid_val[1];
     86 	lsp->l_fnamelen = bsp->f_namemax;
     87 }
     88 
     89 /*
     90  * Convert NetBSD statvfs structure to Linux statfs64 structure.
     91  * See comments in bsd_to_linux_statfs() for further background.
     92  * We can safely pass correct bsize and frsize here, since Linux glibc
     93  * statvfs() doesn't use statfs64().
     94  */
     95 static void __unused
     96 bsd_to_linux_statfs64(const struct statvfs *bsp, struct linux_statfs64 *lsp)
     97 {
     98 	int i, div;
     99 
    100 	memset(lsp, 0, sizeof(*lsp));
    101 
    102 	for (i = 0; i < linux_fstypes_cnt; i++) {
    103 		if (strcmp(bsp->f_fstypename, linux_fstypes[i].mty_bsd) == 0) {
    104 			lsp->l_ftype = linux_fstypes[i].mty_linux;
    105 			break;
    106 		}
    107 	}
    108 
    109 	if (i == linux_fstypes_cnt) {
    110 		lsp->l_ftype = LINUX_DEFAULT_SUPER_MAGIC;
    111 	}
    112 
    113 	div = bsp->f_frsize ? (bsp->f_bsize / bsp->f_frsize) : 1;
    114 	if (div == 0)
    115 		div = 1;
    116 	lsp->l_fbsize = bsp->f_bsize;
    117 	lsp->l_ffrsize = bsp->f_frsize;
    118 	lsp->l_fblocks = bsp->f_blocks / div;
    119 	lsp->l_fbfree = bsp->f_bfree / div;
    120 	lsp->l_fbavail = bsp->f_bavail / div;
    121 	lsp->l_ffiles = bsp->f_files;
    122 	lsp->l_fffree = bsp->f_ffree / div;
    123 	/* Linux sets the fsid to 0..., we don't */
    124 	lsp->l_ffsid.val[0] = bsp->f_fsidx.__fsid_val[0];
    125 	lsp->l_ffsid.val[1] = bsp->f_fsidx.__fsid_val[1];
    126 	lsp->l_fnamelen = bsp->f_namemax;
    127 }
    128 
    129 #endif /* !_LINUX_STATFS_H */
    130