1 files changed, 102 insertions, 0 deletions
diff --git a/sys/geom/label/g_label_ufs.c b/sys/geom/label/g_label_ufs.c
new file mode 100644
index 0000000..dc188f7
--- /dev/null
+++ b/sys/geom/label/g_label_ufs.c
@@ -0,0 +1,102 @@
+/*-
+ * Copyright (c) 2002, 2003 Gordon Tetlow
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions 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 AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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/systm.h>
+#include <sys/kernel.h>
+#include <sys/malloc.h>
+
+#include <ufs/ufs/dinode.h>
+#include <ufs/ffs/fs.h>
+
+#include <geom/geom.h>
+#include <geom/label/g_label.h>
+
+#define G_LABEL_UFS_DIR	"ufs"
+
+static const int superblocks[] = SBLOCKSEARCH;
+
+static void
+g_label_ufs_taste(struct g_consumer *cp, char *label, size_t size)
+{
+	struct g_provider *pp;
+	int error, sb, superblock;
+	struct fs *fs;
+
+	g_topology_assert_not();
+	pp = cp->provider;
+	label[0] = '\0';
+	/*
+	 * Walk through the standard places that superblocks hide and look
+	 * for UFS magic. If we find magic, then check that the size in the
+	 * superblock corresponds to the size of the underlying provider.
+	 * Finally, look for a volume label and create an appropriate 
+	 * provider based on that.
+	 */
+	for (sb = 0; (superblock = superblocks[sb]) != -1; sb++) {
+		fs = (struct fs *)g_read_data(cp, superblock, SBLOCKSIZE,
+		    &error);
+		if (fs == NULL || error != 0)
+			continue;
+		/* Check for magic and make sure things are the right size */
+		if (fs->fs_magic == FS_UFS1_MAGIC) {
+			G_LABEL_DEBUG(1, "UFS1 file system detected on %s.",
+			    pp->name);
+			if (fs->fs_old_size * fs->fs_fsize !=
+			    (int32_t)pp->mediasize) {
+				g_free(fs);
+				continue;
+			}
+		} else if (fs->fs_magic == FS_UFS2_MAGIC) {
+			G_LABEL_DEBUG(1, "UFS2 file system detected on %s.",
+			    pp->name);
+			if (fs->fs_size * fs->fs_fsize !=
+			    (int64_t)pp->mediasize) {
+				g_free(fs);
+				continue;
+			}
+		} else {
+			g_free(fs);
+			continue;
+		}
+		/* Check for volume label */
+		if (fs->fs_volname[0] == '\0') {
+			g_free(fs);
+			continue;
+		}
+		strlcpy(label, fs->fs_volname, size);
+		g_free(fs);
+		break;
+	}
+}
+
+const struct g_label_desc g_label_ufs = {
+	.ld_taste = g_label_ufs_taste,
+	.ld_dir = G_LABEL_UFS_DIR
+};