/* $OpenBSD: ext2fs_df.c,v 1.10 2003/06/02 23:32:07 millert 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/param.h> #include <sys/mount.h> #include <ufs/ext2fs/ext2fs.h> #include <ufs/ext2fs/ext2fs_dinode.h> #include <unistd.h> #include <stdlib.h> #include <string.h> #include <fcntl.h> #include <fstab.h> int e2fs_df(int, char *, struct statfs *); extern int bread(int, off_t, void *, int); extern char *getmntpt(char *); 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; ipb = sfsp->f_bsize / sizeof(struct ext2fs_dinode); 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 = ""; memmove(&sfsp->f_mntonname[0], mntpt, MNAMELEN); memmove(&sfsp->f_mntfromname[0], file, MNAMELEN); strlcpy(sfsp->f_fstypename, MOUNT_EXT2FS, MFSNAMELEN); return (0); }