xref: /openbmc/linux/drivers/md/raid10.h (revision 4bdf0bb7)
1 #ifndef _RAID10_H
2 #define _RAID10_H
3 
4 typedef struct mirror_info mirror_info_t;
5 
6 struct mirror_info {
7 	mdk_rdev_t	*rdev;
8 	sector_t	head_position;
9 };
10 
11 typedef struct r10bio_s r10bio_t;
12 
13 struct r10_private_data_s {
14 	mddev_t			*mddev;
15 	mirror_info_t		*mirrors;
16 	int			raid_disks;
17 	spinlock_t		device_lock;
18 
19 	/* geometry */
20 	int			near_copies;  /* number of copies layed out raid0 style */
21 	int 			far_copies;   /* number of copies layed out
22 					       * at large strides across drives
23 					       */
24 	int			far_offset;   /* far_copies are offset by 1 stripe
25 					       * instead of many
26 					       */
27 	int			copies;	      /* near_copies * far_copies.
28 					       * must be <= raid_disks
29 					       */
30 	sector_t		stride;	      /* distance between far copies.
31 					       * This is size / far_copies unless
32 					       * far_offset, in which case it is
33 					       * 1 stripe.
34 					       */
35 
36 	int chunk_shift; /* shift from chunks to sectors */
37 	sector_t chunk_mask;
38 
39 	struct list_head	retry_list;
40 	/* queue pending writes and submit them on unplug */
41 	struct bio_list		pending_bio_list;
42 
43 
44 	spinlock_t		resync_lock;
45 	int nr_pending;
46 	int nr_waiting;
47 	int nr_queued;
48 	int barrier;
49 	sector_t		next_resync;
50 	int			fullsync;  /* set to 1 if a full sync is needed,
51 					    * (fresh device added).
52 					    * Cleared when a sync completes.
53 					    */
54 
55 	wait_queue_head_t	wait_barrier;
56 
57 	mempool_t *r10bio_pool;
58 	mempool_t *r10buf_pool;
59 	struct page		*tmppage;
60 };
61 
62 typedef struct r10_private_data_s conf_t;
63 
64 /*
65  * this is our 'private' RAID10 bio.
66  *
67  * it contains information about what kind of IO operations were started
68  * for this RAID10 operation, and about their status:
69  */
70 
71 struct r10bio_s {
72 	atomic_t		remaining; /* 'have we finished' count,
73 					    * used from IRQ handlers
74 					    */
75 	sector_t		sector;	/* virtual sector number */
76 	int			sectors;
77 	unsigned long		state;
78 	mddev_t			*mddev;
79 	/*
80 	 * original bio going to /dev/mdx
81 	 */
82 	struct bio		*master_bio;
83 	/*
84 	 * if the IO is in READ direction, then this is where we read
85 	 */
86 	int			read_slot;
87 
88 	struct list_head	retry_list;
89 	/*
90 	 * if the IO is in WRITE direction, then multiple bios are used,
91 	 * one for each copy.
92 	 * When resyncing we also use one for each copy.
93 	 * When reconstructing, we use 2 bios, one for read, one for write.
94 	 * We choose the number when they are allocated.
95 	 */
96 	struct {
97 		struct bio		*bio;
98 		sector_t addr;
99 		int devnum;
100 	} devs[0];
101 };
102 
103 /* when we get a read error on a read-only array, we redirect to another
104  * device without failing the first device, or trying to over-write to
105  * correct the read error.  To keep track of bad blocks on a per-bio
106  * level, we store IO_BLOCKED in the appropriate 'bios' pointer
107  */
108 #define IO_BLOCKED ((struct bio*)1)
109 
110 /* bits for r10bio.state */
111 #define	R10BIO_Uptodate	0
112 #define	R10BIO_IsSync	1
113 #define	R10BIO_IsRecover 2
114 #define	R10BIO_Degraded 3
115 #endif
116