1 files changed, 122 insertions, 0 deletions
diff --git a/lib/libufs/sblock.c b/lib/libufs/sblock.c
new file mode 100644
index 000000000000..278c8ef1a916
--- /dev/null
+++ b/lib/libufs/sblock.c
@@ -0,0 +1,122 @@
+/*
+ * 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 <fcntl.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+
+#include <libufs.h>
+
+static int superblocks[] = SBLOCKSEARCH;
+
+int
+sbread(struct uufsd *disk)
+{
+	struct fs *fs;
+	int sb, superblock;
+
+	DEBUG(NULL);
+
+	fs = &disk->d_fs;
+	superblock = superblocks[0];
+
+	for (sb = 0; (superblock = superblocks[sb]) != -1; sb++) {
+		if (bread(disk, superblock, disk->d_sb, SBLOCKSIZE) == -1) {
+			DEBUG(NULL);
+			return -1;
+		}
+		if (fs->fs_magic == FS_UFS1_MAGIC)
+			disk->d_ufs = 1;
+		if ((fs->fs_magic == FS_UFS2_MAGIC) &&
+		    (fs->fs_sblockloc == numfrags(fs, superblock)))
+			disk->d_ufs = 2;
+		if ((fs->fs_bsize <= MAXBSIZE) &&
+		    (fs->fs_bsize >= sizeof(*fs))) {
+			if (disk->d_ufs)
+				break;
+		}
+		disk->d_ufs = 0;
+	}
+	if (superblock == -1 || disk->d_ufs == 0) {
+		/*
+		 * Other error cases will result in errno being set, here we
+		 * must set it to indicate no superblock could be found with
+		 * which to associate this disk/filesystem.
+		 */
+		DEBUG("no superblock found");
+		errno = ENOENT;
+		return -1;
+	}
+	disk->d_bsize = fs->fs_fsize / fsbtodb(fs, 1);
+	disk->d_sblock = superblock / disk->d_bsize;
+	return 0;
+}
+
+int
+sbwrite(struct uufsd *disk, int all)
+{
+	struct fs *fs;
+	int i, rofd;
+
+	fs = &disk->d_fs;
+
+	rofd = disk->d_fd;
+	disk->d_fd = open(disk->d_name, O_WRONLY);
+	if (disk->d_fd < 0) {
+		DEBUG("open");
+		return -1;
+	}
+	if (bwrite(disk, disk->d_sblock, fs, SBLOCKSIZE) == -1) {
+		DEBUG(NULL);
+		return -1;
+	}
+	if (all) {
+		for (i = 0; i < fs->fs_ncg; i++)
+			if (bwrite(disk, fsbtodb(fs, cgsblock(fs, i)),
+			    fs, SBLOCKSIZE) == -1) {
+				DEBUG(NULL);
+				return -1;
+			}
+	}
+	close(disk->d_fd);
+	disk->d_fd = rofd;
+	return 0;
+}