raid1.h
上传用户:lgb322
上传日期:2013-02-24
资源大小:30529k
文件大小:2k
- #ifndef _RAID1_H
- #define _RAID1_H
- #include <linux/raid/md.h>
- struct mirror_info {
- int number;
- int raid_disk;
- kdev_t dev;
- int sect_limit;
- int head_position;
- /*
- * State bits:
- */
- int operational;
- int write_only;
- int spare;
- int used_slot;
- };
- struct raid1_private_data {
- mddev_t *mddev;
- struct mirror_info mirrors[MD_SB_DISKS];
- int nr_disks;
- int raid_disks;
- int working_disks;
- int last_used;
- unsigned long next_sect;
- int sect_count;
- mdk_thread_t *thread, *resync_thread;
- int resync_mirrors;
- struct mirror_info *spare;
- md_spinlock_t device_lock;
- /* buffer pool */
- /* buffer_heads that we have pre-allocated have b_pprev -> &freebh
- * and are linked into a stack using b_next
- * raid1_bh that are pre-allocated have R1BH_PreAlloc set.
- * All these variable are protected by device_lock
- */
- struct buffer_head *freebh;
- int freebh_cnt; /* how many are on the list */
- int freebh_blocked;
- struct raid1_bh *freer1;
- int freer1_blocked;
- int freer1_cnt;
- struct raid1_bh *freebuf; /* each bh_req has a page allocated */
- md_wait_queue_head_t wait_buffer;
- /* for use when syncing mirrors: */
- unsigned long start_active, start_ready,
- start_pending, start_future;
- int cnt_done, cnt_active, cnt_ready,
- cnt_pending, cnt_future;
- int phase;
- int window;
- md_wait_queue_head_t wait_done;
- md_wait_queue_head_t wait_ready;
- md_spinlock_t segment_lock;
- };
- typedef struct raid1_private_data raid1_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) ((raid1_conf_t *) mddev->private)
- /*
- * this is our 'private' 'collective' RAID1 buffer head.
- * it contains information about what kind of IO operations were started
- * for this RAID1 operation, and about their status:
- */
- struct raid1_bh {
- atomic_t remaining; /* 'have we finished' count,
- * used from IRQ handlers
- */
- int cmd;
- unsigned long state;
- mddev_t *mddev;
- struct buffer_head *master_bh;
- struct buffer_head *mirror_bh_list;
- struct buffer_head bh_req;
- struct raid1_bh *next_r1; /* next for retry or in free list */
- };
- /* bits for raid1_bh.state */
- #define R1BH_Uptodate 1
- #define R1BH_SyncPhase 2
- #define R1BH_PreAlloc 3 /* this was pre-allocated, add to free list */
- #endif