Bring in the GEOM Virtualisation class, which allows to create huge GEOM

providers with limited physical storage and add physical storage as
needed.

Submitted by:	Ivan Voras
Sponsored by:	Google Summer of Code 2006
Approved by:	re (kensmith)

1 files changed, 91 insertions, 0 deletions

diff --git a/sys/geom/virstor/g_virstor_md.c b/sys/geom/virstor/g_virstor_md.c
new file mode 100644
index 0000000..59e8b98
--- /dev/null
+++ b/sys/geom/virstor/g_virstor_md.c
@@ -0,0 +1,91 @@
+/*-
+ * Copyright (c) 2005 Ivan Voras <ivoras@freebsd.org>
+ * 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 AUTHORS 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 AUTHORS 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/endian.h>
+
+#include <geom/virstor/g_virstor_md.h>
+#include <geom/virstor/binstream.h>
+
+/*
+ * Encode data from g_virstor_metadata structure into a endian-independant
+ * byte stream.
+ */
+void
+virstor_metadata_encode(struct g_virstor_metadata *md, unsigned char *data)
+{
+	bin_stream_t bs;
+
+	bs_open(&bs, data);
+
+	bs_write_buf(&bs, md->md_magic, sizeof(md->md_magic));
+	bs_write_u32(&bs, md->md_version);
+	bs_write_buf(&bs, md->md_name, sizeof(md->md_name));
+	bs_write_u64(&bs, md->md_virsize);
+	bs_write_u32(&bs, md->md_chunk_size);
+	bs_write_u32(&bs, md->md_id);
+	bs_write_u16(&bs, md->md_count);
+
+	bs_write_buf(&bs, md->provider, sizeof(md->provider));
+	bs_write_u16(&bs, md->no);
+	bs_write_u64(&bs, md->provsize);
+	bs_write_u32(&bs, md->chunk_count);
+	bs_write_u32(&bs, md->chunk_next);
+	bs_write_u16(&bs, md->chunk_reserved);
+	bs_write_u16(&bs, md->flags);
+}
+
+
+/*
+ * Decode data from endian-independant byte stream into g_virstor_metadata
+ * structure.
+ */
+void
+virstor_metadata_decode(unsigned char *data, struct g_virstor_metadata *md)
+{
+	bin_stream_t bs;
+
+	bs_open(&bs, (char *)(data));
+
+	bs_read_buf(&bs, md->md_magic, sizeof(md->md_magic));
+	md->md_version = bs_read_u32(&bs);
+	bs_read_buf(&bs, md->md_name, sizeof(md->md_name));
+	md->md_virsize = bs_read_u64(&bs);
+	md->md_chunk_size = bs_read_u32(&bs);
+	md->md_id = bs_read_u32(&bs);
+	md->md_count = bs_read_u16(&bs);
+
+	bs_read_buf(&bs, md->provider, sizeof(md->provider));
+	md->no = bs_read_u16(&bs);
+	md->provsize = bs_read_u64(&bs);
+	md->chunk_count = bs_read_u32(&bs);
+	md->chunk_next = bs_read_u32(&bs);
+	md->chunk_reserved = bs_read_u16(&bs);
+	md->flags = bs_read_u16(&bs);
+}