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