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/* $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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} |