diff options
Diffstat (limited to 'include/linux/raid5.h')
| -rw-r--r-- | include/linux/raid5.h | 110 |
1 files changed, 110 insertions, 0 deletions
diff --git a/include/linux/raid5.h b/include/linux/raid5.h new file mode 100644 index 000000000..214f49de1 --- /dev/null +++ b/include/linux/raid5.h @@ -0,0 +1,110 @@ +#ifndef _RAID5_H +#define _RAID5_H + +#ifdef __KERNEL__ +#include <linux/md.h> +#include <asm/atomic.h> + +struct disk_info { + kdev_t dev; + int operational; + int number; + int raid_disk; + int write_only; + int spare; +}; + +struct stripe_head { + struct stripe_head *hash_next, **hash_pprev; /* hash pointers */ + struct stripe_head *free_next; /* pool of free sh's */ + struct buffer_head *buffer_pool; /* pool of free buffers */ + struct buffer_head *bh_pool; /* pool of free bh's */ + struct raid5_data *raid_conf; + struct buffer_head *bh_old[MD_SB_DISKS]; /* disk image */ + struct buffer_head *bh_new[MD_SB_DISKS]; /* buffers of the MD device (present in buffer cache) */ + struct buffer_head *bh_copy[MD_SB_DISKS]; /* copy on write of bh_new (bh_new can change from under us) */ + struct buffer_head *bh_req[MD_SB_DISKS]; /* copy of bh_new (only the buffer heads), queued to the lower levels */ + int cmd_new[MD_SB_DISKS]; /* READ/WRITE for new */ + int new[MD_SB_DISKS]; /* buffer added since the last handle_stripe() */ + unsigned long sector; /* sector of this row */ + int size; /* buffers size */ + int pd_idx; /* parity disk index */ + int nr_pending; /* nr of pending cmds */ + __u32 state; /* state flags */ + int cmd; /* stripe cmd */ + int count; /* nr of waiters */ + int write_method; /* reconstruct-write / read-modify-write */ + int phase; /* PHASE_BEGIN, ..., PHASE_COMPLETE */ + struct wait_queue *wait; /* processes waiting for this stripe */ +}; + +/* + * Phase + */ +#define PHASE_BEGIN 0 +#define PHASE_READ_OLD 1 +#define PHASE_WRITE 2 +#define PHASE_READ 3 +#define PHASE_COMPLETE 4 + +/* + * Write method + */ +#define METHOD_NONE 0 +#define RECONSTRUCT_WRITE 1 +#define READ_MODIFY_WRITE 2 + +/* + * Stripe state + */ +#define STRIPE_LOCKED 0 +#define STRIPE_ERROR 1 + +/* + * Stripe commands + */ +#define STRIPE_NONE 0 +#define STRIPE_WRITE 1 +#define STRIPE_READ 2 + +struct raid5_data { + struct stripe_head **stripe_hashtbl; + struct md_dev *mddev; + struct md_thread *thread, *resync_thread; + struct disk_info disks[MD_SB_DISKS]; + struct disk_info *spare; + int buffer_size; + int chunk_size, level, algorithm; + int raid_disks, working_disks, failed_disks; + int sector_count; + unsigned long next_sector; + atomic_t nr_handle; + struct stripe_head *next_free_stripe; + int nr_stripes; + int resync_parity; + int max_nr_stripes; + int clock; + int nr_hashed_stripes; + int nr_locked_stripes; + int nr_pending_stripes; + int nr_cached_stripes; + + /* + * Free stripes pool + */ + int nr_free_sh; + struct stripe_head *free_sh_list; + struct wait_queue *wait_for_stripe; +}; + +#endif + +/* + * Our supported algorithms + */ +#define ALGORITHM_LEFT_ASYMMETRIC 0 +#define ALGORITHM_RIGHT_ASYMMETRIC 1 +#define ALGORITHM_LEFT_SYMMETRIC 2 +#define ALGORITHM_RIGHT_SYMMETRIC 3 + +#endif |