--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/include/linux/raid/raid1.h	Sun Jan 11 20:20:11 2009 +0100
@@ -0,0 +1,134 @@
+#ifndef _RAID1_H
+#define _RAID1_H
+
+#include <linux/raid/md.h>
+
+typedef struct mirror_info mirror_info_t;
+
+struct mirror_info {
+	mdk_rdev_t	*rdev;
+	sector_t	head_position;
+};
+
+/*
+ * memory pools need a pointer to the mddev, so they can force an unplug
+ * when memory is tight, and a count of the number of drives that the
+ * pool was allocated for, so they know how much to allocate and free.
+ * mddev->raid_disks cannot be used, as it can change while a pool is active
+ * These two datums are stored in a kmalloced struct.
+ */
+
+struct pool_info {
+	mddev_t *mddev;
+	int	raid_disks;
+};
+
+
+typedef struct r1bio_s r1bio_t;
+
+struct r1_private_data_s {
+	mddev_t			*mddev;
+	mirror_info_t		*mirrors;
+	int			raid_disks;
+	int			last_used;
+	sector_t		next_seq_sect;
+	spinlock_t		device_lock;
+
+	struct list_head	retry_list;
+	/* queue pending writes and submit them on unplug */
+	struct bio_list		pending_bio_list;
+	/* queue of writes that have been unplugged */
+	struct bio_list		flushing_bio_list;
+
+	/* for use when syncing mirrors: */
+
+	spinlock_t		resync_lock;
+	int			nr_pending;
+	int			nr_waiting;
+	int			nr_queued;
+	int			barrier;
+	sector_t		next_resync;
+	int			fullsync;  /* set to 1 if a full sync is needed,
+					    * (fresh device added).
+					    * Cleared when a sync completes.
+					    */
+
+	wait_queue_head_t	wait_barrier;
+
+	struct pool_info	*poolinfo;
+
+	struct page		*tmppage;
+
+	mempool_t *r1bio_pool;
+	mempool_t *r1buf_pool;
+};
+
+typedef struct r1_private_data_s conf_t;
+
+/*
+ * this is the only point in the RAID code where we violate
+ * C type safety. mddev->private is an 'opaque' pointer.
+ */
+#define mddev_to_conf(mddev) ((conf_t *) mddev->private)
+
+/*
+ * this is our 'private' RAID1 bio.
+ *
+ * it contains information about what kind of IO operations were started
+ * for this RAID1 operation, and about their status:
+ */
+
+struct r1bio_s {
+	atomic_t		remaining; /* 'have we finished' count,
+					    * used from IRQ handlers
+					    */
+	atomic_t		behind_remaining; /* number of write-behind ios remaining
+						 * in this BehindIO request
+						 */
+	sector_t		sector;
+	int			sectors;
+	unsigned long		state;
+	mddev_t			*mddev;
+	/*
+	 * original bio going to /dev/mdx
+	 */
+	struct bio		*master_bio;
+	/*
+	 * if the IO is in READ direction, then this is where we read
+	 */
+	int			read_disk;
+
+	struct list_head	retry_list;
+	struct bitmap_update	*bitmap_update;
+	/*
+	 * if the IO is in WRITE direction, then multiple bios are used.
+	 * We choose the number when they are allocated.
+	 */
+	struct bio		*bios[0];
+	/* DO NOT PUT ANY NEW FIELDS HERE - bios array is contiguously alloced*/
+};
+
+/* when we get a read error on a read-only array, we redirect to another
+ * device without failing the first device, or trying to over-write to
+ * correct the read error.  To keep track of bad blocks on a per-bio
+ * level, we store IO_BLOCKED in the appropriate 'bios' pointer
+ */
+#define IO_BLOCKED ((struct bio*)1)
+
+/* bits for r1bio.state */
+#define	R1BIO_Uptodate	0
+#define	R1BIO_IsSync	1
+#define	R1BIO_Degraded	2
+#define	R1BIO_BehindIO	3
+#define	R1BIO_Barrier	4
+#define R1BIO_BarrierRetry 5
+/* For write-behind requests, we call bi_end_io when
+ * the last non-write-behind device completes, providing
+ * any write was successful.  Otherwise we call when
+ * any write-behind write succeeds, otherwise we call
+ * with failure when last write completes (and all failed).
+ * Record that bi_end_io was called with this flag...
+ */
+#define	R1BIO_Returned 6
+
+#endif