128 lines
4.6 KiB
C
128 lines
4.6 KiB
C
/* $NetBSD: linux_statfs.h,v 1.6 2012/09/13 13:59:33 pooka Exp $ */
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/*-
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* Copyright (c) 1995, 1998, 1999 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Frank van der Linden and Eric Haszlakiewicz; by Jason R. Thorpe
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* of the Numerical Aerospace Simulation Facility, NASA Ames Research Center.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _LINUX_STATFS_H
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#define _LINUX_STATFS_H
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static void __unused bsd_to_linux_statfs(const struct statvfs *,
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struct linux_statfs *);
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static void __unused bsd_to_linux_statfs64(const struct statvfs *,
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struct linux_statfs64 *);
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/*
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* Convert NetBSD statvfs structure to Linux statfs structure.
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* Linux doesn't have f_flag, and we can't set f_frsize due
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* to glibc statvfs() bug (see below).
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*/
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static void __unused
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bsd_to_linux_statfs(const struct statvfs *bsp, struct linux_statfs *lsp)
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{
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int i;
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for (i = 0; i < linux_fstypes_cnt; i++) {
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if (strcmp(bsp->f_fstypename, linux_fstypes[i].mty_bsd) == 0) {
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lsp->l_ftype = linux_fstypes[i].mty_linux;
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break;
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}
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}
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if (i == linux_fstypes_cnt) {
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lsp->l_ftype = LINUX_DEFAULT_SUPER_MAGIC;
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}
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/*
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* The sizes are expressed in number of blocks. The block
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* size used for the size is f_frsize for POSIX-compliant
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* statvfs. Linux statfs uses f_bsize as the block size
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* (f_frsize used to not be available in Linux struct statfs).
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* However, glibc 2.3.3 statvfs() wrapper fails to adjust the block
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* counts for different f_frsize if f_frsize is provided by the kernel.
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* POSIX conforming apps thus get wrong size if f_frsize
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* is different to f_bsize. Thus, we just pretend we don't
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* support f_frsize.
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*/
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lsp->l_fbsize = bsp->f_frsize;
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lsp->l_ffrsize = 0; /* compat */
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lsp->l_fblocks = bsp->f_blocks;
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lsp->l_fbfree = bsp->f_bfree;
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lsp->l_fbavail = bsp->f_bavail;
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lsp->l_ffiles = bsp->f_files;
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lsp->l_fffree = bsp->f_ffree;
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/* Linux sets the fsid to 0..., we don't */
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lsp->l_ffsid.val[0] = bsp->f_fsidx.__fsid_val[0];
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lsp->l_ffsid.val[1] = bsp->f_fsidx.__fsid_val[1];
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lsp->l_fnamelen = bsp->f_namemax;
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(void)memset(lsp->l_fspare, 0, sizeof(lsp->l_fspare));
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}
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/*
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* Convert NetBSD statvfs structure to Linux statfs64 structure.
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* See comments in bsd_to_linux_statfs() for further background.
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* We can safely pass correct bsize and frsize here, since Linux glibc
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* statvfs() doesn't use statfs64().
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*/
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static void __unused
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bsd_to_linux_statfs64(const struct statvfs *bsp, struct linux_statfs64 *lsp)
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{
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int i, div;
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for (i = 0; i < linux_fstypes_cnt; i++) {
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if (strcmp(bsp->f_fstypename, linux_fstypes[i].mty_bsd) == 0) {
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lsp->l_ftype = linux_fstypes[i].mty_linux;
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break;
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}
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}
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if (i == linux_fstypes_cnt) {
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lsp->l_ftype = LINUX_DEFAULT_SUPER_MAGIC;
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}
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div = bsp->f_frsize ? (bsp->f_bsize / bsp->f_frsize) : 1;
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if (div == 0)
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div = 1;
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lsp->l_fbsize = bsp->f_bsize;
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lsp->l_ffrsize = bsp->f_frsize;
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lsp->l_fblocks = bsp->f_blocks / div;
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lsp->l_fbfree = bsp->f_bfree / div;
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lsp->l_fbavail = bsp->f_bavail / div;
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lsp->l_ffiles = bsp->f_files;
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lsp->l_fffree = bsp->f_ffree / div;
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/* Linux sets the fsid to 0..., we don't */
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lsp->l_ffsid.val[0] = bsp->f_fsidx.__fsid_val[0];
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lsp->l_ffsid.val[1] = bsp->f_fsidx.__fsid_val[1];
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lsp->l_fnamelen = bsp->f_namemax;
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(void)memset(lsp->l_fspare, 0, sizeof(lsp->l_fspare));
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}
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#endif /* !_LINUX_STATFS_H */
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