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Merge commit 'v2.6.37-rc7' into x86/security
[mirror_ubuntu-artful-kernel.git] / drivers / md / raid1.h
1 #ifndef _RAID1_H
2 #define _RAID1_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 /*
12 * memory pools need a pointer to the mddev, so they can force an unplug
13 * when memory is tight, and a count of the number of drives that the
14 * pool was allocated for, so they know how much to allocate and free.
15 * mddev->raid_disks cannot be used, as it can change while a pool is active
16 * These two datums are stored in a kmalloced struct.
17 */
18
19 struct pool_info {
20 mddev_t *mddev;
21 int raid_disks;
22 };
23
24
25 typedef struct r1bio_s r1bio_t;
26
27 struct r1_private_data_s {
28 mddev_t *mddev;
29 mirror_info_t *mirrors;
30 int raid_disks;
31 int last_used;
32 sector_t next_seq_sect;
33 spinlock_t device_lock;
34
35 struct list_head retry_list;
36 /* queue pending writes and submit them on unplug */
37 struct bio_list pending_bio_list;
38
39 /* for use when syncing mirrors: */
40
41 spinlock_t resync_lock;
42 int nr_pending;
43 int nr_waiting;
44 int nr_queued;
45 int barrier;
46 sector_t next_resync;
47 int fullsync; /* set to 1 if a full sync is needed,
48 * (fresh device added).
49 * Cleared when a sync completes.
50 */
51
52 wait_queue_head_t wait_barrier;
53
54 struct pool_info *poolinfo;
55
56 struct page *tmppage;
57
58 mempool_t *r1bio_pool;
59 mempool_t *r1buf_pool;
60
61 /* When taking over an array from a different personality, we store
62 * the new thread here until we fully activate the array.
63 */
64 struct mdk_thread_s *thread;
65 };
66
67 typedef struct r1_private_data_s conf_t;
68
69 /*
70 * this is our 'private' RAID1 bio.
71 *
72 * it contains information about what kind of IO operations were started
73 * for this RAID1 operation, and about their status:
74 */
75
76 struct r1bio_s {
77 atomic_t remaining; /* 'have we finished' count,
78 * used from IRQ handlers
79 */
80 atomic_t behind_remaining; /* number of write-behind ios remaining
81 * in this BehindIO request
82 */
83 sector_t sector;
84 int sectors;
85 unsigned long state;
86 mddev_t *mddev;
87 /*
88 * original bio going to /dev/mdx
89 */
90 struct bio *master_bio;
91 /*
92 * if the IO is in READ direction, then this is where we read
93 */
94 int read_disk;
95
96 struct list_head retry_list;
97 struct bitmap_update *bitmap_update;
98 /*
99 * if the IO is in WRITE direction, then multiple bios are used.
100 * We choose the number when they are allocated.
101 */
102 struct bio *bios[0];
103 /* DO NOT PUT ANY NEW FIELDS HERE - bios array is contiguously alloced*/
104 };
105
106 /* when we get a read error on a read-only array, we redirect to another
107 * device without failing the first device, or trying to over-write to
108 * correct the read error. To keep track of bad blocks on a per-bio
109 * level, we store IO_BLOCKED in the appropriate 'bios' pointer
110 */
111 #define IO_BLOCKED ((struct bio*)1)
112
113 /* bits for r1bio.state */
114 #define R1BIO_Uptodate 0
115 #define R1BIO_IsSync 1
116 #define R1BIO_Degraded 2
117 #define R1BIO_BehindIO 3
118 /* For write-behind requests, we call bi_end_io when
119 * the last non-write-behind device completes, providing
120 * any write was successful. Otherwise we call when
121 * any write-behind write succeeds, otherwise we call
122 * with failure when last write completes (and all failed).
123 * Record that bi_end_io was called with this flag...
124 */
125 #define R1BIO_Returned 6
126
127 #endif