1 files changed, 103 insertions, 0 deletions
diff --git a/include/linux/raid/raid10.h b/include/linux/raid/raid10.h
new file mode 100644
index 00000000000..60708789c8f
--- /dev/null
+++ b/include/linux/raid/raid10.h
@@ -0,0 +1,103 @@
+#ifndef _RAID10_H
+#define _RAID10_H
+
+#include <linux/raid/md.h>
+
+typedef struct mirror_info mirror_info_t;
+
+struct mirror_info {
+	mdk_rdev_t	*rdev;
+	sector_t	head_position;
+};
+
+typedef struct r10bio_s r10bio_t;
+
+struct r10_private_data_s {
+	mddev_t			*mddev;
+	mirror_info_t		*mirrors;
+	int			raid_disks;
+	int			working_disks;
+	spinlock_t		device_lock;
+
+	/* geometry */
+	int			near_copies;  /* number of copies layed out raid0 style */
+	int 			far_copies;   /* number of copies layed out
+					       * at large strides across drives
+					       */
+	int			copies;	      /* near_copies * far_copies.
+					       * must be <= raid_disks
+					       */
+	sector_t		stride;	      /* distance between far copies.
+					       * This is size / far_copies
+					       */
+
+	int chunk_shift; /* shift from chunks to sectors */
+	sector_t chunk_mask;
+
+	struct list_head	retry_list;
+	/* for use when syncing mirrors: */
+
+	spinlock_t		resync_lock;
+	int nr_pending;
+	int barrier;
+	sector_t		next_resync;
+
+	wait_queue_head_t	wait_idle;
+	wait_queue_head_t	wait_resume;
+
+	mempool_t *r10bio_pool;
+	mempool_t *r10buf_pool;
+};
+
+typedef struct r10_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' RAID10 bio.
+ *
+ * it contains information about what kind of IO operations were started
+ * for this RAID10 operation, and about their status:
+ */
+
+struct r10bio_s {
+	atomic_t		remaining; /* 'have we finished' count,
+					    * used from IRQ handlers
+					    */
+	sector_t		sector;	/* virtual sector number */
+	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_slot;
+
+	struct list_head	retry_list;
+	/*
+	 * if the IO is in WRITE direction, then multiple bios are used,
+	 * one for each copy.
+	 * When resyncing we also use one for each copy.
+	 * When reconstructing, we use 2 bios, one for read, one for write.
+	 * We choose the number when they are allocated.
+	 */
+	struct {
+		struct bio		*bio;
+		sector_t addr;
+		int devnum;
+	} devs[0];
+};
+
+/* bits for r10bio.state */
+#define	R10BIO_Uptodate	0
+#define	R10BIO_IsSync	1
+#define	R10BIO_IsRecover 2
+#endif