- #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