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 <fcntl.h> 42 #include <stdio.h> 43 #include <string.h> 44 #include <unistd.h> 45 46 #include <libufs.h> 47 48 ssize_t 49 bread(struct uufsd *disk, ufs2_daddr_t blockno, void *data, size_t size) 50 { 51 char *buf; 52 ssize_t cnt; 53 54 ERROR(disk, NULL); 55 56 /* 57 * For when we need to work with the data as a buffer. 58 */ 59 buf = data; 60 61 cnt = pread(disk->d_fd, data, size, (off_t)(blockno * disk->d_bsize)); 62 if (cnt == -1) { 63 ERROR(disk, "read error from block device"); 64 goto fail; 65 } 66 if (cnt == 0) { 67 ERROR(disk, "end of file from block device"); 68 goto fail; 69 } 70 if ((size_t)cnt != size) { 71 ERROR(disk, "short read or read error from block device"); 72 goto fail; 73 } 74 return (cnt); 75 fail: memset(buf, 0, size); 76 return (-1); 77 } 78 79 ssize_t 80 bwrite(struct uufsd *disk, ufs2_daddr_t blockno, const void *data, size_t size) 81 { 82 ssize_t cnt; 83 int rv; 84 85 ERROR(disk, NULL); 86 87 rv = ufs_disk_write(disk); 88 if (rv == -1) { 89 ERROR(disk, "failed to open disk for writing"); 90 return (-1); 91 } 92 93 cnt = pwrite(disk->d_fd, data, size, (off_t)(blockno * disk->d_bsize)); 94 if (cnt == -1) { 95 ERROR(disk, "write error to block device"); 96 return (-1); 97 } 98 if ((size_t)cnt != size) { 99 ERROR(disk, "short write to block device"); 100 return (-1); 101 } 102 103 return (cnt); 104 } 105