cgroup.c revision 109518
1/* 2 * Copyright (c) 2003 Juli Mallett. All rights reserved. 3 * 4 * This software was written by Juli Mallett <jmallett@FreeBSD.org> for the 5 * FreeBSD project. Redistribution and use in source and binary forms, with 6 * or without modification, are permitted provided that the following 7 * conditions are met: 8 * 9 * 1. Redistribution of source code must retain the above copyright notice, 10 * this list of conditions and the following disclaimer. 11 * 2. Redistribution in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 17 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 18 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, 19 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 20 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 21 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 23 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING 24 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 25 * POSSIBILITY OF SUCH DAMAGE. 26 */ 27 28#include <sys/cdefs.h> 29__FBSDID("$FreeBSD: head/lib/libufs/cgroup.c 109518 2003-01-19 05:46:23Z jmallett $"); 30 31#include <sys/param.h> 32#include <sys/mount.h> 33#include <sys/disklabel.h> 34#include <sys/stat.h> 35 36#include <ufs/ufs/ufsmount.h> 37#include <ufs/ufs/dinode.h> 38#include <ufs/ffs/fs.h> 39 40#include <errno.h> 41#include <fcntl.h> 42#include <stdio.h> 43#include <string.h> 44#include <unistd.h> 45 46#include <libufs.h> 47 48int 49cgread(struct uufsd *disk) 50{ 51 return cgread1(disk, disk->d_ccg++); 52} 53 54int 55cgread1(struct uufsd *disk, int c) 56{ 57 struct fs *fs; 58 off_t ccg; 59 60 fs = &disk->d_fs; 61 62 if (c >= fs->fs_ncg) { 63 return 0; 64 } 65 ccg = fsbtodb(fs, cgtod(fs, c)) * disk->d_bsize; 66 if (bread(disk, fsbtodb(fs, cgtod(fs, c)), disk->d_cgunion.d_buf, 67 fs->fs_bsize) == -1) { 68 ERROR(disk, "unable to read cylinder group"); 69 return -1; 70 } 71 disk->d_lcg = c; 72 return 1; 73} 74