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#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;

        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                     far_offset;   /* far_copies are offset by 1 stripe

                                               * instead of many

                                               */

        int                     copies;       /* near_copies * far_copies.

                                               * must be <= raid_disks

                                               */

        sector_t                stride;       /* distance between far copies.

                                               * This is size / far_copies unless

                                               * far_offset, in which case it is

                                               * 1 stripe.

                                               */

        int chunk_shift; /* shift from chunks to sectors */

        sector_t chunk_mask;

        struct list_head        retry_list;

        /* queue pending writes and submit them on unplug */

        struct bio_list         pending_bio_list;

        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;

        mempool_t *r10bio_pool;

        mempool_t *r10buf_pool;

        struct page             *tmppage;

};

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];

};

/* 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 r10bio.state */

#define R10BIO_Uptodate 0

#define R10BIO_IsSync   1

#define R10BIO_IsRecover 2

#define R10BIO_Degraded 3

#endif