1 /* $OpenBSD: ext2fs_df.c,v 1.7 2001/05/11 18:40:46 mickey Exp $ */ 2 3 /* 4 * This file is substantially derived from src/sys/ufs/ext2fs/ext2fs_vfsops.c:e2fs_statfs(). 5 * That file's copyright is applied here. 6 */ 7 8 /* Modified for EXT2FS on NetBSD by Manuel Bouyer, April 1997 */ 9 10 /* 11 * Copyright (c) 1989, 1991, 1993, 1994 12 * The Regents of the University of California. All rights reserved. 13 * 14 * Redistribution and use in source and binary forms, with or without 15 * modification, are permitted provided that the following conditions 16 * are met: 17 * 1. Redistributions of source code must retain the above copyright 18 * notice, this list of conditions and the following disclaimer. 19 * 2. Redistributions in binary form must reproduce the above copyright 20 * notice, this list of conditions and the following disclaimer in the 21 * documentation and/or other materials provided with the distribution. 22 * 3. All advertising materials mentioning features or use of this software 23 * must display the following acknowledgement: 24 * This product includes software developed by the University of 25 * California, Berkeley and its contributors. 26 * 4. Neither the name of the University nor the names of its contributors 27 * may be used to endorse or promote products derived from this software 28 * without specific prior written permission. 29 * 30 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 31 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 32 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 33 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 34 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 35 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 36 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 37 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 38 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 39 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 40 * SUCH DAMAGE. 41 * 42 * @(#)ffs_vfsops.c 8.14 (Berkeley) 11/28/94 43 */ 44 45 #include <sys/param.h> 46 #include <sys/mount.h> 47 #include <ufs/ext2fs/ext2fs.h> 48 #include <ufs/ext2fs/ext2fs_dinode.h> 49 #include <unistd.h> 50 #include <stdlib.h> 51 #include <string.h> 52 #include <fcntl.h> 53 #include <fstab.h> 54 55 int e2fs_df __P((int, char *, struct statfs *)); 56 57 extern int bread __P((int, off_t, void *, int)); 58 extern char *getmntpt __P((char *)); 59 60 union { 61 struct ext2fs ie_fs; 62 char dummy[SBSIZE]; 63 } sb; 64 #define sblock sb.ie_fs 65 66 int 67 e2fs_df(rfd, file, sfsp) 68 int rfd; 69 char *file; 70 struct statfs *sfsp; 71 { 72 char *mntpt; 73 u_int32_t overhead, overhead_per_group; 74 int32_t ncg, ngdb, ipb, itpg; 75 76 if (bread(rfd, (off_t)SBOFF, &sblock, SBSIZE) == 0) { 77 return (-1); 78 } 79 if ((sblock.e2fs_magic != E2FS_MAGIC) || 80 (sblock.e2fs_rev != E2FS_REV0 && sblock.e2fs_rev != E2FS_REV1)) { 81 return (-1); 82 } 83 sfsp->f_flags = 0; /* The fs is not mapped, so no flags */ 84 sfsp->f_bsize = 1024 << sblock.e2fs_log_bsize; 85 sfsp->f_iosize = 1024 << sblock.e2fs_log_bsize; 86 87 ipb = sfsp->f_bsize / sizeof(struct ext2fs_dinode); 88 itpg = sblock.e2fs_ipg/ipb; 89 90 ncg = howmany(sblock.e2fs_bcount - sblock.e2fs_first_dblock, 91 sblock.e2fs_bpg); 92 ngdb = howmany(ncg, sfsp->f_bsize / sizeof(struct ext2_gd)); 93 overhead_per_group = 1 /* super block */ + 94 ngdb + 95 1 /* block bitmap */ + 96 1 /* inode bitmap */ + 97 itpg; 98 overhead = sblock.e2fs_first_dblock + ncg * overhead_per_group; 99 100 sfsp->f_blocks = sblock.e2fs_bcount - overhead; 101 sfsp->f_bfree = sblock.e2fs_fbcount; 102 sfsp->f_bavail = sfsp->f_bfree - sblock.e2fs_rbcount; 103 sfsp->f_files = sblock.e2fs_icount; 104 sfsp->f_ffree = sblock.e2fs_ficount; 105 sfsp->f_fsid.val[0] = 0; 106 sfsp->f_fsid.val[1] = 0; 107 if ((mntpt = getmntpt(file)) == 0) 108 mntpt = ""; 109 memmove(&sfsp->f_mntonname[0], mntpt, MNAMELEN); 110 memmove(&sfsp->f_mntfromname[0], file, MNAMELEN); 111 strlcpy(sfsp->f_fstypename, MOUNT_EXT2FS, MFSNAMELEN); 112 return (0); 113 } 114