Use udev to create /dev/zvol/[dataset_name] links

This commit allows zvols with names longer than 32 characters, which
fixes issue on https://github.com/behlendorf/zfs/issues/#issue/102.

Changes include:
- use /dev/zd* device names for zvol, where * is the device minor
  (include/sys/fs/zfs.h, module/zfs/zvol.c).
- add BLKZNAME ioctl to get dataset name from userland
  (include/sys/fs/zfs.h, module/zfs/zvol.c, cmd/zvol_id).
- add udev rule to create /dev/zvol/[dataset_name] and the legacy
  /dev/[dataset_name] symlink. For partitions on zvol, it will create
  /dev/zvol/[dataset_name]-part* (etc/udev/rules.d/60-zvol.rules,
  cmd/zvol_id).

Signed-off-by: Brian Behlendorf <[email protected]>

3 files changed, 734 insertions, 0 deletions

diff --git a/cmd/zvol_id/Makefile.am b/cmd/zvol_id/Makefile.am
new file mode 100644
index 000000000..dcdea58b9
--- /dev/null
+++ b/cmd/zvol_id/Makefile.am
@@ -0,0 +1,10 @@
+include $(top_srcdir)/config/Rules.am
+
+DEFAULT_INCLUDES += \
+	-I$(top_srcdir)/include \
+	-I$(top_srcdir)/lib/libspl/include
+
+bin_PROGRAMS = zvol_id
+
+zvol_id_SOURCES = \
+	$(top_srcdir)/cmd/zvol_id/zvol_id_main.c
diff --git a/cmd/zvol_id/Makefile.in b/cmd/zvol_id/Makefile.in
new file mode 100644
index 000000000..0489034dc
--- /dev/null
+++ b/cmd/zvol_id/Makefile.in
@@ -0,0 +1,634 @@
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+
+zvol_id_main.obj: $(top_srcdir)/cmd/zvol_id/zvol_id_main.c
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+	-rm -f *.lo
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+	-rm -rf .libs _libs
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+tags: TAGS
+
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+	here=`pwd`; \
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+	unique=`for i in $$list; do \
+	    if test -f "$$i"; then echo $$i; else echo $(srcdir)/$$i; fi; \
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+	  || $(CTAGS) $(CTAGSFLAGS) $(AM_CTAGSFLAGS) $(CTAGS_ARGS) \
+	     $$unique
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+GTAGS:
+	here=`$(am__cd) $(top_builddir) && pwd` \
+	  && $(am__cd) $(top_srcdir) \
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+distdir: $(DISTFILES)
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+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/cmd/zvol_id/zvol_id_main.c b/cmd/zvol_id/zvol_id_main.c
new file mode 100644
index 000000000..2aa8abbdc
--- /dev/null
+++ b/cmd/zvol_id/zvol_id_main.c
@@ -0,0 +1,90 @@
+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License (the "License").
+ * You may not use this file except in compliance with the License.
+ *
+ * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+ * or http://www.opensolaris.org/os/licensing.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ */
+/*
+ * Copyright (c) 2011, Fajar A. Nugraha.  All rights reserved.
+ * Use is subject to license terms.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <linux/ioctl.h>
+#include <sys/stat.h>
+#include <sys/ioctl.h>
+#include <sys/zfs_znode.h>
+#include <sys/fs/zfs.h>
+
+int ioctl_get_msg(char *var, int fd)
+{
+	int error = 0;
+	char msg[ZFS_MAXNAMELEN];
+
+	error = ioctl(fd, BLKZNAME, msg);
+	if (error < 0) {
+		printf("ioctl_get_msg failed:%d\n", error);
+		return (error);
+	}
+
+	snprintf(var, ZFS_MAXNAMELEN, "%s", msg);
+	return (error);
+}
+
+int main(int argc, char **argv)
+{
+	int fd, error = 0;
+	char zvol_name[ZFS_MAXNAMELEN], zvol_name_part[ZFS_MAXNAMELEN];
+	char *dev_name;
+	struct stat64 statbuf;
+	int dev_minor, dev_part;
+
+	if (argc < 2) {
+		printf("Usage: %s /dev/zvol_device_node\n", argv[0]);
+		return (EINVAL);
+	}
+
+	dev_name = argv[1];
+	error = stat64(dev_name, &statbuf);
+	if (error != 0) {
+		printf("Unable to access device file: %s\n", dev_name);
+		return (errno);
+	}
+
+	dev_minor = minor(statbuf.st_rdev);
+	dev_part = dev_minor % ZVOL_MINORS;
+
+	fd = open(dev_name, O_RDONLY);
+	if (fd < 0) {
+		printf("Unable to open device file: %s\n", dev_name);
+		return (errno);
+	}
+
+	ioctl_get_msg(zvol_name, fd);
+	if (dev_part > 0)
+		snprintf(zvol_name_part, ZFS_MAXNAMELEN, "%s-part%d", zvol_name,
+		    dev_part);
+	else
+		snprintf(zvol_name_part, ZFS_MAXNAMELEN, "%s", zvol_name);
+
+	printf("%s\n", zvol_name_part);
+	close(fd);
+	return (error);
+}