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 36static void __unused bsd_to_linux_statfs(const struct statvfs *, 37 struct linux_statfs *); 38static 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 */ 46static void __unused 47bsd_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 */ 95static void __unused 96bsd_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