1 #ifndef _RAID1_H
2 #define _RAID1_H
3 
4 #include <linux/raid/md.h>
5 
6 struct mirror_info {
7 	int		number;
8 	int		raid_disk;
9 	kdev_t		dev;
10 	int		sect_limit;
11 	int		head_position;
12 
13 	/*
14 	 * State bits:
15 	 */
16 	int		operational;
17 	int		write_only;
18 	int		spare;
19 
20 	int		used_slot;
21 };
22 
23 struct raid1_private_data {
24 	mddev_t			*mddev;
25 	struct mirror_info	mirrors[MD_SB_DISKS];
26 	int			nr_disks;
27 	int			raid_disks;
28 	int			working_disks;
29 	int			last_used;
30 	unsigned long		next_sect;
31 	int			sect_count;
32 	mdk_thread_t		*thread, *resync_thread;
33 	int			resync_mirrors;
34 	struct mirror_info	*spare;
35 	md_spinlock_t		device_lock;
36 
37 	/* buffer pool */
38 	/* buffer_heads that we have pre-allocated have b_pprev -> &freebh
39 	 * and are linked into a stack using b_next
40 	 * raid1_bh that are pre-allocated have R1BH_PreAlloc set.
41 	 * All these variable are protected by device_lock
42 	 */
43 	struct buffer_head	*freebh;
44 	int			freebh_cnt;	/* how many are on the list */
45 	int			freebh_blocked;
46 	struct raid1_bh		*freer1;
47 	int			freer1_blocked;
48 	int			freer1_cnt;
49 	struct raid1_bh		*freebuf; 	/* each bh_req has a page allocated */
50 	md_wait_queue_head_t	wait_buffer;
51 
52 	/* for use when syncing mirrors: */
53 	unsigned long	start_active, start_ready,
54 		start_pending, start_future;
55 	int	cnt_done, cnt_active, cnt_ready,
56 		cnt_pending, cnt_future;
57 	int	phase;
58 	int	window;
59 	md_wait_queue_head_t	wait_done;
60 	md_wait_queue_head_t	wait_ready;
61 	md_spinlock_t		segment_lock;
62 };
63 
64 typedef struct raid1_private_data raid1_conf_t;
65 
66 /*
67  * this is the only point in the RAID code where we violate
68  * C type safety. mddev->private is an 'opaque' pointer.
69  */
70 #define mddev_to_conf(mddev) ((raid1_conf_t *) mddev->private)
71 
72 /*
73  * this is our 'private' 'collective' RAID1 buffer head.
74  * it contains information about what kind of IO operations were started
75  * for this RAID1 operation, and about their status:
76  */
77 
78 struct raid1_bh {
79 	atomic_t		remaining; /* 'have we finished' count,
80 					    * used from IRQ handlers
81 					    */
82 	int			cmd;
83 	unsigned long		state;
84 	mddev_t			*mddev;
85 	struct buffer_head	*master_bh;
86 	struct buffer_head	*mirror_bh_list;
87 	struct buffer_head	bh_req;
88 	struct raid1_bh		*next_r1;	/* next for retry or in free list */
89 };
90 /* bits for raid1_bh.state */
91 #define	R1BH_Uptodate	1
92 #define	R1BH_SyncPhase	2
93 #define	R1BH_PreAlloc	3	/* this was pre-allocated, add to free list */
94 #endif
95