1 /* 2 * Copyright (c) 2002 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("$FreeBSD$"); 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 <stdio.h> 42 #include <string.h> 43 #include <unistd.h> 44 45 #include <libufs.h> 46 47 ssize_t 48 bread(struct uufsd *disk, ufs2_daddr_t blockno, void *data, size_t size) 49 { 50 char *buf; 51 ssize_t cnt; 52 53 DEBUG(NULL); 54 55 /* 56 * For when we need to work with the data as a buffer. 57 */ 58 buf = data; 59 60 cnt = pread(disk->d_fd, data, size, (off_t)(blockno * disk->d_bsize)); 61 /* 62 * In case of failure, zero data, which must be fs_bsize. 63 */ 64 if (cnt != size) { 65 DEBUG("short read"); 66 for (cnt = 0; cnt < disk->d_fs.fs_bsize; cnt++) 67 buf[cnt] = 0; 68 return -1; 69 } 70 return cnt; 71 } 72 73 ssize_t 74 bwrite(struct uufsd *disk, ufs2_daddr_t blockno, const void *data, size_t size) 75 { 76 ssize_t cnt; 77 78 DEBUG(NULL); 79 80 cnt = pwrite(disk->d_fd, data, size, (off_t)(blockno * disk->d_bsize)); 81 if (cnt != size) { 82 DEBUG("short write"); 83 return -1; 84 } 85 86 return cnt; 87 } 88