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88 lines
3.0 KiB
C
88 lines
3.0 KiB
C
/* Copyright (C) 1998-2020 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <assert.h>
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#include <errno.h>
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#include <mntent.h>
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#include <paths.h>
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#include <stdbool.h>
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#include <stdio_ext.h>
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#include <string.h>
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#include <sys/mount.h>
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#include <sys/stat.h>
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#include <sys/statfs.h>
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#include "internal_statvfs.h"
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#include "linux_fsinfo.h"
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#include <kernel-features.h>
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/* Special internal-only bit value. */
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#define ST_VALID 0x0020
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#ifndef STATFS
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# define STATFS statfs
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# define STATVFS statvfs
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# define INTERNAL_STATVFS __internal_statvfs
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#else
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extern int __statvfs_getflags (const char *name, int fstype, int fd);
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#endif
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void
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INTERNAL_STATVFS (const char *name, struct STATVFS *buf,
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struct STATFS *fsbuf, int fd)
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{
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/* Now fill in the fields we have information for. */
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buf->f_bsize = fsbuf->f_bsize;
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/* Linux has the f_frsize size only in later version of the kernel.
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If the value is not filled in use f_bsize. */
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buf->f_frsize = fsbuf->f_frsize ?: fsbuf->f_bsize;
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buf->f_blocks = fsbuf->f_blocks;
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buf->f_bfree = fsbuf->f_bfree;
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buf->f_bavail = fsbuf->f_bavail;
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buf->f_files = fsbuf->f_files;
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buf->f_ffree = fsbuf->f_ffree;
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if (sizeof (buf->f_fsid) == sizeof (fsbuf->f_fsid))
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/* The shifting uses 'unsigned long long int' even though the target
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field might only have 32 bits. This is OK since the 'if' branch
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is not used in this case but the compiler would still generate
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warnings. */
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buf->f_fsid = ((fsbuf->f_fsid.__val[0]
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& ((1ULL << (8 * sizeof (fsbuf->f_fsid.__val[0]))) - 1))
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| ((unsigned long long int) fsbuf->f_fsid.__val[1]
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<< (8 * (sizeof (buf->f_fsid)
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- sizeof (fsbuf->f_fsid.__val[0])))));
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else
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/* We cannot help here. The statvfs element is not large enough to
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contain both words of the statfs f_fsid field. */
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buf->f_fsid = fsbuf->f_fsid.__val[0];
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#ifdef _STATVFSBUF_F_UNUSED
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buf->__f_unused = 0;
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#endif
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buf->f_namemax = fsbuf->f_namelen;
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memset (buf->__f_spare, '\0', sizeof (buf->__f_spare));
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/* What remains to do is to fill the fields f_favail and f_flag. */
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/* XXX I have no idea how to compute f_favail. Any idea??? */
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buf->f_favail = buf->f_ffree;
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buf->f_flag = fsbuf->f_flags ^ ST_VALID;
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}
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