Add NTFS labeling function.

Reviewed by:pjd

sys/geom/label/g_label.c

@@ -81,6 +81,7 @@ const struct g_label_desc *g_labels[] = {
 	&g_label_msdosfs,
 	&g_label_ext2fs,
 	&g_label_reiserfs,
+	&g_label_ntfs,
 	NULL
 };
 

sys/geom/label/g_label.h

@@ -69,6 +69,7 @@ extern const struct g_label_desc g_label_iso9660;
 extern const struct g_label_desc g_label_msdosfs;
 extern const struct g_label_desc g_label_ext2fs;
 extern const struct g_label_desc g_label_reiserfs;
+extern const struct g_label_desc g_label_ntfs;
 #endif	/* _KERNEL */
 
 struct g_label_metadata {

sys/geom/label/g_label_ntfs.c

@@ -0,0 +1,113 @@
+/*-
+ * Copyright (c) 2005 Takanori Watanabe
+ * 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 <fs/ntfs/ntfs.h>
+
+#include <geom/geom.h>
+#include <geom/label/g_label.h>
+
+#define G_LABEL_NTFS_DIR	"ntfs"
+
+
+static void
+g_label_ntfs_taste(struct g_consumer *cp, char *label, size_t size)
+{
+	struct g_provider *pp;
+	struct bootfile *bf;
+	struct attr    *atr;
+	char           *filerecp = NULL, *ap, vnchar;
+	struct filerec *fr;
+	char		mftrecsz;
+	int		recsize;
+	int		error;
+	int		j;
+	off_t		voloff;
+	g_topology_assert_not();
+	pp = cp->provider;
+	label[0] = '\0';
+	
+	bf = (struct bootfile *)g_read_data(cp, 0, pp->sectorsize, &error);
+
+	if (bf == NULL || strncmp(bf->bf_sysid, "NTFS    ", 8) != 0) {
+		goto done;
+	}
+	
+	mftrecsz = (char)bf->bf_mftrecsz;
+	recsize = (mftrecsz > 0) ? (mftrecsz * bf->bf_bps * bf->bf_spc) : (1 << -mftrecsz);
+	
+	voloff = bf->bf_mftcn * bf->bf_spc * bf->bf_bps +
+	  recsize * NTFS_VOLUMEINO;
+	if(voloff % pp->sectorsize != 0)
+		goto done;
+
+	filerecp = g_read_data(cp, voloff, recsize, &error);
+	fr = (struct filerec *)filerecp;
+	for (ap = filerecp + fr->fr_attroff; atr = (struct attr *)ap, atr->a_hdr.a_type != -1; ap += atr->a_hdr.reclen) {
+		if (atr->a_hdr.a_type == NTFS_A_VOLUMENAME) {
+			if(atr->a_r.a_datalen >= size *2){
+				label[0] = 0;
+				goto done;
+			}
+			/*
+			 *UNICODE to ASCII.
+			 * Should we need to use iconv(9)?
+			 */
+			for (j = 0; j < atr->a_r.a_datalen; j++) {
+				vnchar = *(ap + atr->a_r.a_dataoff + j);
+				if ((j & 1)) {
+					if (vnchar) {
+						label[0] = 0;
+						goto done;
+					}
+				} else {
+					label[j / 2] = vnchar;
+				}
+			}
+			label[j / 2] = 0;
+			break;
+		}
+	}
+done:
+	if (bf != NULL)
+		g_free(bf);
+	if (filerecp != NULL)
+		g_free(filerecp);
+	return;
+
+}
+
+const struct g_label_desc g_label_ntfs = {
+	.ld_taste = g_label_ntfs_taste,
+	.ld_dir = G_LABEL_NTFS_DIR
+};

sys/modules/geom/geom_label/Makefile

@@ -7,6 +7,7 @@ SRCS=	g_label.c
 SRCS+=	g_label_ext2fs.c
 SRCS+=	g_label_iso9660.c
 SRCS+=	g_label_msdosfs.c
+SRCS+=	g_label_ntfs.c
 SRCS+=	g_label_reiserfs.c
 SRCS+=	g_label_ufs.c