Release 4.7 drivers/md/raid10.h

#ifndef _RAID10_H

#define _RAID10_H


struct raid10_info {
	

struct md_rdev	*rdev, *replacement;
	
sector_t	head_position;
	
int		recovery_disabled;	/* matches
                                                 * mddev->recovery_disabled
                                                 * when we shouldn't try
                                                 * recovering this device.
                                                 */
};


struct r10conf {
	
struct mddev		*mddev;
	
struct raid10_info	*mirrors;
	

struct raid10_info	*mirrors_new, *mirrors_old;
	
spinlock_t		device_lock;

	/* geometry */
	
struct geom {
		
int		raid_disks;
		
int		near_copies;  /* number of copies laid out
                                               * raid0 style */
		
int		far_copies;   /* number of copies laid out
                                               * at large strides across drives
                                               */
		
int		far_offset;   /* far_copies are offset by 1
                                               * stripe instead of many
                                               */
		
sector_t	stride;	      /* distance between far copies.
                                               * This is size / far_copies unless
                                               * far_offset, in which case it is
                                               * 1 stripe.
                                               */
		
int             far_set_size; /* The number of devices in a set,
                                               * where a 'set' are devices that
                                               * contain far/offset copies of
                                               * each other.
                                               */
		
int		chunk_shift; /* shift from chunks to sectors */
		
sector_t	chunk_mask;
	} 

prev, geo;
	
int			copies;	      /* near_copies * far_copies.
                                               * must be <= raid_disks
                                               */

	
sector_t		dev_sectors;  /* temp copy of
                                               * mddev->dev_sectors */
	
sector_t		reshape_progress;
	
sector_t		reshape_safe;
	
unsigned long		reshape_checkpoint;
	
sector_t		offset_diff;

	
struct list_head	retry_list;
	/* A separate list of r1bio which just need raid_end_bio_io called.
         * This mustn't happen for writes which had any errors if the superblock
         * needs to be written.
         */
	
struct list_head	bio_end_io_list;

	/* queue pending writes and submit them on unplug */
	
struct bio_list		pending_bio_list;
	
int			pending_count;

	
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.
                                            */
	
int			have_replacement; /* There is at least one
                                                   * replacement device.
                                                   */
	
wait_queue_head_t	wait_barrier;

	
mempool_t		*r10bio_pool;
	
mempool_t		*r10buf_pool;
	
struct page		*tmppage;

	/* When taking over an array from a different personality, we store
         * the new thread here until we fully activate the array.
         */
	
struct md_thread	*thread;
};

/*
 * 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 {
	
atomic_t		remaining; /* 'have we finished' count,
                                            * used from IRQ handlers
                                            */
	
sector_t		sector;	/* virtual sector number */
	
int			sectors;
	
unsigned long		state;
	
struct mddev		*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.
         * We sometimes need an extra bio to write to the replacement.
         */
	
struct r10dev {
		
struct bio	*bio;
		union {
			
struct bio	*repl_bio; /* used for resync and
                                                    * writes */
			
struct md_rdev	*rdev;	   /* used for reads
                                                    * (read_slot >= 0) */
		};
		
sector_t	addr;
		
int		devnum;
	} 
devs[0];
};

/* bits for r10bio.state */

enum r10bio_state {
	
R10BIO_Uptodate,
	
R10BIO_IsSync,
	
R10BIO_IsRecover,
	
R10BIO_IsReshape,
	
R10BIO_Degraded,
/* Set ReadError on bios that experience a read error
 * so that raid10d knows what to do with them.
 */
	
R10BIO_ReadError,
/* If a write for this request means we can clear some
 * known-bad-block records, we set this flag.
 */
	
R10BIO_MadeGood,
	
R10BIO_WriteError,
/* During a reshape we might be performing IO on the
 * 'previous' part of the array, in which case this
 * flag is set
 */
	
R10BIO_Previous,
};
#endif
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