88 lines
2.4 KiB
C
88 lines
2.4 KiB
C
|
/*
|
||
|
|
* Copyright (c) 2002 Juli Mallett. All rights reserved.
|
||
|
|
*
|
||
|
|
* This software was written by Juli Mallett <jmallett@FreeBSD.org> for the
|
||
|
|
* FreeBSD project. Redistribution and use in source and binary forms, with
|
||
|
|
* or without modification, are permitted provided that the following
|
||
|
|
* conditions are met:
|
||
|
|
*
|
||
|
|
* 1. Redistribution of source code must retain the above copyright notice,
|
||
|
|
* this list of conditions and the following disclaimer.
|
||
|
|
* 2. Redistribution in binary form must reproduce the above copyright
|
||
|
|
* notice, this list of conditions and the following disclaimer in the
|
||
|
|
* documentation and/or other materials provided with the distribution.
|
||
|
|
*
|
||
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
|
||
|
|
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
|
||
|
|
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
|
||
|
|
* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
|
||
|
|
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
|
||
|
|
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
|
||
|
|
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
||
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
|
||
|
|
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
|
||
|
|
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
||
|
|
* POSSIBILITY OF SUCH DAMAGE.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <sys/cdefs.h>
|
||
|
|
__FBSDID("$FreeBSD$");
|
||
|
|
|
||
|
|
#include <sys/param.h>
|
||
|
|
#include <sys/mount.h>
|
||
|
|
#include <sys/disklabel.h>
|
||
|
|
#include <sys/stat.h>
|
||
|
|
|
||
|
|
#include <ufs/ufs/ufsmount.h>
|
||
|
|
#include <ufs/ufs/dinode.h>
|
||
|
|
#include <ufs/ffs/fs.h>
|
||
|
|
|
||
|
|
#include <errno.h>
|
||
|
|
#include <stdio.h>
|
||
|
|
#include <string.h>
|
||
|
|
#include <unistd.h>
|
||
|
|
|
||
|
|
#include <libufs.h>
|
||
|
|
|
||
|
|
ssize_t
|
||
|
|
bread(struct uufsd *disk, ufs2_daddr_t blockno, void *data, size_t size)
|
||
|
|
{
|
||
|
|
char *buf;
|
||
|
|
ssize_t cnt;
|
||
|
|
|
||
|
|
DEBUG(NULL);
|
||
|
|
|
||
|
|
/*
|
||
|
|
* For when we need to work with the data as a buffer.
|
||
|
|
*/
|
||
|
|
buf = data;
|
||
|
|
|
||
|
|
cnt = pread(disk->d_fd, data, size, (off_t)(blockno * disk->d_bsize));
|
||
|
|
/*
|
||
|
|
* In case of failure, zero data, which must be fs_bsize.
|
||
|
|
*/
|
||
|
|
if (cnt != size) {
|
||
|
|
DEBUG("short read");
|
||
|
|
for (cnt = 0; cnt < disk->d_fs.fs_bsize; cnt++)
|
||
|
|
buf[cnt] = 0;
|
||
|
|
return -1;
|
||
|
|
}
|
||
|
|
return cnt;
|
||
|
|
}
|
||
|
|
|
||
|
|
ssize_t
|
||
|
|
bwrite(struct uufsd *disk, ufs2_daddr_t blockno, const void *data, size_t size)
|
||
|
|
{
|
||
|
|
ssize_t cnt;
|
||
|
|
|
||
|
|
DEBUG(NULL);
|
||
|
|
|
||
|
|
cnt = pwrite(disk->d_fd, data, size, (off_t)(blockno * disk->d_bsize));
|
||
|
|
if (cnt != size) {
|
||
|
|
DEBUG("short write");
|
||
|
|
return -1;
|
||
|
|
}
|
||
|
|
|
||
|
|
return cnt;
|
||
|
|
}
|