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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;
};

typedef struct r1bio_s r1bio_t;

struct r1_private_data_s {
        mddev_t                 *mddev;
        mirror_info_t           *mirrors;
        int                     raid_disks;
        int                     working_disks;
        int                     last_used;
        sector_t                next_seq_sect;
        spinlock_t              device_lock;

        /* 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 *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
                                            */
        int                     cmd;
        sector_t                sector;
        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 bio is used:
         */
        struct bio              *read_bio;
        int                     read_disk;

        r1bio_t                 *next_r1; /* next for retry or in free list */
        struct list_head        retry_list;
        /*
         * if the IO is in WRITE direction, then multiple bios are used.
         * We choose the number when they are allocated.
         */
        struct bio              *write_bios[0];
};

/* bits for r1bio.state */
#define R1BIO_Uptodate  1

#endif