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-rw-r--r--lib/libufs/block.c87
1 files changed, 87 insertions, 0 deletions
diff --git a/lib/libufs/block.c b/lib/libufs/block.c
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+++ b/lib/libufs/block.c
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+/*
+ * 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;
+}