Line data Source code
1 : #ifndef _RAID1_H
2 : #define _RAID1_H
3 :
4 2 : typedef struct mirror_info mirror_info_t;
5 1 :
6 : struct mirror_info {
7 : mdk_rdev_t *rdev;
8 : sector_t head_position;
9 : };
10 1 :
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 2 : typedef struct r1bio_s r1bio_t;
26 1 :
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 : /* queue of writes that have been unplugged */
39 : struct bio_list flushing_bio_list;
40 :
41 : /* for use when syncing mirrors: */
42 :
43 : spinlock_t resync_lock;
44 : int nr_pending;
45 : int nr_waiting;
46 : int nr_queued;
47 : int barrier;
48 : sector_t next_resync;
49 : int fullsync; /* set to 1 if a full sync is needed,
50 : * (fresh device added).
51 : * Cleared when a sync completes.
52 : */
53 :
54 : wait_queue_head_t wait_barrier;
55 :
56 : struct pool_info *poolinfo;
57 :
58 : struct page *tmppage;
59 :
60 : mempool_t *r1bio_pool;
61 : mempool_t *r1buf_pool;
62 :
63 : /* When taking over an array from a different personality, we store
64 : * the new thread here until we fully activate the array.
65 : */
66 : struct mdk_thread_s *thread;
67 : };
68 :
69 1 : typedef struct r1_private_data_s conf_t;
70 2 :
71 : /*
72 : * this is our 'private' RAID1 bio.
73 : *
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 r1bio_s {
79 : atomic_t remaining; /* 'have we finished' count,
80 : * used from IRQ handlers
81 : */
82 : atomic_t behind_remaining; /* number of write-behind ios remaining
83 : * in this BehindIO request
84 : */
85 : sector_t sector;
86 : int sectors;
87 : unsigned long state;
88 : mddev_t *mddev;
89 : /*
90 : * original bio going to /dev/mdx
91 : */
92 : struct bio *master_bio;
93 : /*
94 : * if the IO is in READ direction, then this is where we read
95 : */
96 : int read_disk;
97 :
98 : struct list_head retry_list;
99 : struct bitmap_update *bitmap_update;
100 : /*
101 : * if the IO is in WRITE direction, then multiple bios are used.
102 : * We choose the number when they are allocated.
103 : */
104 : struct bio *bios[0];
105 : /* DO NOT PUT ANY NEW FIELDS HERE - bios array is contiguously alloced*/
106 : };
107 :
108 : /* when we get a read error on a read-only array, we redirect to another
109 : * device without failing the first device, or trying to over-write to
110 : * correct the read error. To keep track of bad blocks on a per-bio
111 : * level, we store IO_BLOCKED in the appropriate 'bios' pointer
112 : */
113 : #define IO_BLOCKED ((struct bio*)1)
114 :
115 : /* bits for r1bio.state */
116 : #define R1BIO_Uptodate 0
117 : #define R1BIO_IsSync 1
118 : #define R1BIO_Degraded 2
119 : #define R1BIO_BehindIO 3
120 : #define R1BIO_Barrier 4
121 : #define R1BIO_BarrierRetry 5
122 : /* For write-behind requests, we call bi_end_io when
123 : * the last non-write-behind device completes, providing
124 : * any write was successful. Otherwise we call when
125 : * any write-behind write succeeds, otherwise we call
126 : * with failure when last write completes (and all failed).
127 : * Record that bi_end_io was called with this flag...
128 : */
129 : #define R1BIO_Returned 6
130 :
131 : #endif
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