Add a first version of a GEOMified vinum.

1 files changed, 93 insertions, 0 deletions

diff --git a/sys/geom/vinum/geom_vinum_raid5.h b/sys/geom/vinum/geom_vinum_raid5.h
new file mode 100644
index 0000000..c43cb10
--- /dev/null
+++ b/sys/geom/vinum/geom_vinum_raid5.h
@@ -0,0 +1,93 @@
+/*
+ * Copyright (c) 2004 Lukas Ertl
+ * 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.
+ *
+ * $FreeBSD$
+ */
+
+#ifndef _GEOM_VINUM_RAID5_H_
+#define	_GEOM_VINUM_RAID5_H_
+
+/*
+ * A single RAID5 request usually needs more than one I/O transaction,
+ * depending on the state of the associated subdisks and the direction of the
+ * transaction (read or write).  Every subrequest of a RAID5 request,
+ * represented by a gv_raid_packet, is defined by a gv_raid5_bit.
+ */
+
+/* A subrequest of a RAID5 read/write operation. */
+struct gv_raid5_bit {
+	struct bio	*bio;		/* BIO of this subrequest. */
+	caddr_t		buf;		/* Data buffer of this subrequest. */
+	int		malloc;		/* Flag if data buffer was malloced. */
+	struct g_consumer *consumer;	/* Consumer to send the BIO to. */
+	TAILQ_ENTRY(gv_raid5_bit) list;	/* Entry in the list of this request. */
+};
+
+/* Container for one or more gv_raid5_bits; represents a RAID5 I/O request. */
+struct gv_raid5_packet {
+	caddr_t	buf;		/* Data buffer of this RAID5 request. */
+	off_t	length;		/* Size of data buffer. */
+	off_t	lockbase;	/* Deny access to our plex offset. */
+	off_t	offset;		/* The drive offset of the subdisk. */
+	int	bufmalloc;	/* Flag if data buffer was malloced. */
+	int	active;		/* Count of active subrequests. */
+	int	rqcount;	/* Count of subrequests. */
+
+	struct bio	*bio;	/* Pointer to the original bio. */
+	caddr_t		 data;	/* Pointer to the original data. */
+
+	struct g_consumer *original;	/* Consumer to the data stripe. */
+	struct g_consumer *parity;	/* Consumer to the parity stripe. */
+
+	/* State of this RAID5 packet. */
+	enum {
+	    SETUP,		/* Newly created. */
+	    VALID,		/* Ready for processing. */
+	    IO,			/* Currently doing I/O. */
+	    FINISH		/* Packet has finished. */
+	} state;
+
+	/* Type of this RAID5 transaction. */
+	enum {
+	    JUNK,		/* Newly created, not valid. */
+	    NORMAL,		/* Normal read or write. */
+	    ISPARITY,		/* Containing only parity data. */
+	    NOPARITY,		/* Parity stripe not available. */
+	    DEGRADED,		/* Data stripe not available. */
+	    COMBINED		/* Data and parity stripes ok, others not. */
+	} type;
+
+	TAILQ_HEAD(,gv_raid5_bit)    bits; /* List of subrequests. */
+	TAILQ_ENTRY(gv_raid5_packet) list; /* Entry in plex's packet list. */
+};
+
+int	gv_build_raid5_req(struct gv_raid5_packet *, struct bio *, caddr_t,
+	    long, off_t);
+void	gv_raid5_done(struct bio *);
+void	gv_raid5_worker(void *);
+struct gv_raid5_packet  *gv_new_raid5_packet(void);
+struct gv_raid5_bit	*gv_new_raid5_bit(void);
+
+#endif /* !_GEOM_VINUM_RAID5_H_ */