1 /* $OpenBSD: ext2fs_df.c,v 1.11 2004/09/14 22:46:04 deraadt 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. Neither the name of the University nor the names of its contributors 23 * may be used to endorse or promote products derived from this software 24 * without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 * 38 * @(#)ffs_vfsops.c 8.14 (Berkeley) 11/28/94 39 */ 40 41 #include <sys/param.h> 42 #include <sys/mount.h> 43 #include <ufs/ext2fs/ext2fs.h> 44 #include <ufs/ext2fs/ext2fs_dinode.h> 45 #include <unistd.h> 46 #include <stdlib.h> 47 #include <string.h> 48 #include <fcntl.h> 49 #include <fstab.h> 50 51 int e2fs_df(int, char *, struct statfs *); 52 53 extern int bread(int, off_t, void *, int); 54 extern char *getmntpt(char *); 55 56 static union { 57 struct ext2fs ie_fs; 58 char dummy[SBSIZE]; 59 } sb; 60 #define sblock sb.ie_fs 61 62 int 63 e2fs_df(int rfd, char *file, struct statfs *sfsp) 64 { 65 char *mntpt; 66 u_int32_t overhead, overhead_per_group; 67 int32_t ncg, ngdb, ipb, itpg; 68 69 if (bread(rfd, (off_t)SBOFF, &sblock, SBSIZE) == 0) { 70 return (-1); 71 } 72 if ((sblock.e2fs_magic != E2FS_MAGIC) || 73 (sblock.e2fs_rev != E2FS_REV0 && sblock.e2fs_rev != E2FS_REV1)) { 74 return (-1); 75 } 76 sfsp->f_flags = 0; /* The fs is not mapped, so no flags */ 77 sfsp->f_bsize = 1024 << sblock.e2fs_log_bsize; 78 sfsp->f_iosize = 1024 << sblock.e2fs_log_bsize; 79 80 ipb = sfsp->f_bsize / sizeof(struct ext2fs_dinode); 81 itpg = sblock.e2fs_ipg/ipb; 82 83 ncg = howmany(sblock.e2fs_bcount - sblock.e2fs_first_dblock, 84 sblock.e2fs_bpg); 85 ngdb = howmany(ncg, sfsp->f_bsize / sizeof(struct ext2_gd)); 86 overhead_per_group = 1 /* super block */ + 87 ngdb + 88 1 /* block bitmap */ + 89 1 /* inode bitmap */ + 90 itpg; 91 overhead = sblock.e2fs_first_dblock + ncg * overhead_per_group; 92 93 sfsp->f_blocks = sblock.e2fs_bcount - overhead; 94 sfsp->f_bfree = sblock.e2fs_fbcount; 95 sfsp->f_bavail = sfsp->f_bfree - sblock.e2fs_rbcount; 96 sfsp->f_files = sblock.e2fs_icount; 97 sfsp->f_ffree = sblock.e2fs_ficount; 98 sfsp->f_fsid.val[0] = 0; 99 sfsp->f_fsid.val[1] = 0; 100 if ((mntpt = getmntpt(file)) == 0) 101 mntpt = ""; 102 memmove(&sfsp->f_mntonname[0], mntpt, MNAMELEN); 103 memmove(&sfsp->f_mntfromname[0], file, MNAMELEN); 104 strlcpy(sfsp->f_fstypename, MOUNT_EXT2FS, MFSNAMELEN); 105 return (0); 106 } 107