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1 #ifndef _RAID10_H
2 #define _RAID10_H
3
4 struct raid10_info {
5 struct md_rdev *rdev, *replacement;
6 sector_t head_position;
7 int recovery_disabled; /* matches
8 * mddev->recovery_disabled
9 * when we shouldn't try
10 * recovering this device.
11 */
12 };
13
14 struct r10conf {
15 struct mddev *mddev;
16 struct raid10_info *mirrors;
17 struct raid10_info *mirrors_new, *mirrors_old;
18 spinlock_t device_lock;
19
20 /* geometry */
21 struct geom {
22 int raid_disks;
23 int near_copies; /* number of copies laid out
24 * raid0 style */
25 int far_copies; /* number of copies laid out
26 * at large strides across drives
27 */
28 int far_offset; /* far_copies are offset by 1
29 * stripe instead of many
30 */
31 sector_t stride; /* distance between far copies.
32 * This is size / far_copies unless
33 * far_offset, in which case it is
34 * 1 stripe.
35 */
36 int far_set_size; /* The number of devices in a set,
37 * where a 'set' are devices that
38 * contain far/offset copies of
39 * each other.
40 */
41 int chunk_shift; /* shift from chunks to sectors */
42 sector_t chunk_mask;
43 } prev, geo;
44 int copies; /* near_copies * far_copies.
45 * must be <= raid_disks
46 */
47
48 sector_t dev_sectors; /* temp copy of
49 * mddev->dev_sectors */
50 sector_t reshape_progress;
51 sector_t reshape_safe;
52 unsigned long reshape_checkpoint;
53 sector_t offset_diff;
54
55 struct list_head retry_list;
56 /* A separate list of r1bio which just need raid_end_bio_io called.
57 * This mustn't happen for writes which had any errors if the superblock
58 * needs to be written.
59 */
60 struct list_head bio_end_io_list;
61
62 /* queue pending writes and submit them on unplug */
63 struct bio_list pending_bio_list;
64 int pending_count;
65
66 spinlock_t resync_lock;
67 atomic_t nr_pending;
68 int nr_waiting;
69 int nr_queued;
70 int barrier;
71 int array_freeze_pending;
72 sector_t next_resync;
73 int fullsync; /* set to 1 if a full sync is needed,
74 * (fresh device added).
75 * Cleared when a sync completes.
76 */
77 int have_replacement; /* There is at least one
78 * replacement device.
79 */
80 wait_queue_head_t wait_barrier;
81
82 mempool_t *r10bio_pool;
83 mempool_t *r10buf_pool;
84 struct page *tmppage;
85
86 /* When taking over an array from a different personality, we store
87 * the new thread here until we fully activate the array.
88 */
89 struct md_thread *thread;
90 };
91
92 /*
93 * this is our 'private' RAID10 bio.
94 *
95 * it contains information about what kind of IO operations were started
96 * for this RAID10 operation, and about their status:
97 */
98
99 struct r10bio {
100 atomic_t remaining; /* 'have we finished' count,
101 * used from IRQ handlers
102 */
103 sector_t sector; /* virtual sector number */
104 int sectors;
105 unsigned long state;
106 struct mddev *mddev;
107 /*
108 * original bio going to /dev/mdx
109 */
110 struct bio *master_bio;
111 /*
112 * if the IO is in READ direction, then this is where we read
113 */
114 int read_slot;
115
116 struct list_head retry_list;
117 /*
118 * if the IO is in WRITE direction, then multiple bios are used,
119 * one for each copy.
120 * When resyncing we also use one for each copy.
121 * When reconstructing, we use 2 bios, one for read, one for write.
122 * We choose the number when they are allocated.
123 * We sometimes need an extra bio to write to the replacement.
124 */
125 struct r10dev {
126 struct bio *bio;
127 union {
128 struct bio *repl_bio; /* used for resync and
129 * writes */
130 struct md_rdev *rdev; /* used for reads
131 * (read_slot >= 0) */
132 };
133 sector_t addr;
134 int devnum;
135 } devs[0];
136 };
137
138 /* bits for r10bio.state */
139 enum r10bio_state {
140 R10BIO_Uptodate,
141 R10BIO_IsSync,
142 R10BIO_IsRecover,
143 R10BIO_IsReshape,
144 R10BIO_Degraded,
145 /* Set ReadError on bios that experience a read error
146 * so that raid10d knows what to do with them.
147 */
148 R10BIO_ReadError,
149 /* If a write for this request means we can clear some
150 * known-bad-block records, we set this flag.
151 */
152 R10BIO_MadeGood,
153 R10BIO_WriteError,
154 /* During a reshape we might be performing IO on the
155 * 'previous' part of the array, in which case this
156 * flag is set
157 */
158 R10BIO_Previous,
159 };
160 #endif