104 lines
3.7 KiB
C
104 lines
3.7 KiB
C
/* $OpenBSD: ext2fs_df.c,v 1.16 2016/03/01 17:57:49 mmcc Exp $ */
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/*
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* This file is substantially derived from src/sys/ufs/ext2fs/ext2fs_vfsops.c:e2fs_statfs().
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* That file's copyright is applied here.
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*/
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/* Modified for EXT2FS on NetBSD by Manuel Bouyer, April 1997 */
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/*
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* Copyright (c) 1989, 1991, 1993, 1994
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* The Regents of the University of California. All rights reserved.
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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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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)ffs_vfsops.c 8.14 (Berkeley) 11/28/94
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*/
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#include <sys/types.h>
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#include <sys/mount.h>
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#include <ufs/ext2fs/ext2fs.h>
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#include <ufs/ext2fs/ext2fs_dinode.h>
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#include <string.h>
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int e2fs_df(int, char *, struct statfs *);
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extern int bread(int, off_t, void *, int);
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extern char *getmntpt(char *);
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static union {
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struct ext2fs ie_fs;
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char dummy[SBSIZE];
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} sb;
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#define sblock sb.ie_fs
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int
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e2fs_df(int rfd, char *file, struct statfs *sfsp)
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{
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char *mntpt;
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u_int32_t overhead, overhead_per_group;
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int32_t ncg, ngdb, ipb, itpg;
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if (bread(rfd, (off_t)SBOFF, &sblock, SBSIZE) == 0) {
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return (-1);
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}
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if ((sblock.e2fs_magic != E2FS_MAGIC) ||
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(sblock.e2fs_rev != E2FS_REV0 && sblock.e2fs_rev != E2FS_REV1)) {
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return (-1);
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}
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sfsp->f_flags = 0; /* The fs is not mapped, so no flags */
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sfsp->f_bsize = 1024 << sblock.e2fs_log_bsize;
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sfsp->f_iosize = 1024 << sblock.e2fs_log_bsize;
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if ((ipb = sfsp->f_bsize / sizeof(struct ext2fs_dinode)) == 0)
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return (-1);
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itpg = sblock.e2fs_ipg / ipb;
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ncg = howmany(sblock.e2fs_bcount - sblock.e2fs_first_dblock,
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sblock.e2fs_bpg);
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ngdb = howmany(ncg, sfsp->f_bsize / sizeof(struct ext2_gd));
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overhead_per_group = 1 /* super block */ +
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ngdb +
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1 /* block bitmap */ +
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1 /* inode bitmap */ +
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itpg;
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overhead = sblock.e2fs_first_dblock + ncg * overhead_per_group;
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sfsp->f_blocks = sblock.e2fs_bcount - overhead;
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sfsp->f_bfree = sblock.e2fs_fbcount;
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sfsp->f_bavail = sfsp->f_bfree - sblock.e2fs_rbcount;
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sfsp->f_files = sblock.e2fs_icount;
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sfsp->f_ffree = sblock.e2fs_ficount;
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sfsp->f_fsid.val[0] = 0;
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sfsp->f_fsid.val[1] = 0;
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if ((mntpt = getmntpt(file)) == 0)
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mntpt = "";
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strlcpy(sfsp->f_mntonname, mntpt, sizeof(sfsp->f_mntonname));
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strlcpy(sfsp->f_mntfromname, file, sizeof(sfsp->f_mntfromname));
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strlcpy(sfsp->f_fstypename, MOUNT_EXT2FS, sizeof(sfsp->f_fstypename));
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return (0);
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}
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