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#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