Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | #ifndef _RAID10_H |
2 | #define _RAID10_H | |
3 | ||
1da177e4 | 4 | struct mirror_info { |
69335ef3 | 5 | struct md_rdev *rdev, *replacement; |
1da177e4 | 6 | sector_t head_position; |
2bb77736 N |
7 | int recovery_disabled; /* matches |
8 | * mddev->recovery_disabled | |
9 | * when we shouldn't try | |
10 | * recovering this device. | |
11 | */ | |
1da177e4 LT |
12 | }; |
13 | ||
e879a879 | 14 | struct r10conf { |
fd01b88c | 15 | struct mddev *mddev; |
0f6d02d5 | 16 | struct mirror_info *mirrors; |
1da177e4 LT |
17 | spinlock_t device_lock; |
18 | ||
19 | /* geometry */ | |
5cf00fcd N |
20 | struct geom { |
21 | int raid_disks; | |
22 | int near_copies; /* number of copies laid out | |
69335ef3 | 23 | * raid0 style */ |
5cf00fcd | 24 | int far_copies; /* number of copies laid out |
1da177e4 LT |
25 | * at large strides across drives |
26 | */ | |
5cf00fcd | 27 | int far_offset; /* far_copies are offset by 1 |
69335ef3 | 28 | * stripe instead of many |
c93983bf | 29 | */ |
5cf00fcd | 30 | sector_t stride; /* distance between far copies. |
c93983bf N |
31 | * This is size / far_copies unless |
32 | * far_offset, in which case it is | |
33 | * 1 stripe. | |
1da177e4 | 34 | */ |
5cf00fcd N |
35 | int chunk_shift; /* shift from chunks to sectors */ |
36 | sector_t chunk_mask; | |
37 | } geo; | |
38 | int copies; /* near_copies * far_copies. | |
39 | * must be <= raid_disks | |
40 | */ | |
1da177e4 | 41 | |
69335ef3 N |
42 | sector_t dev_sectors; /* temp copy of |
43 | * mddev->dev_sectors */ | |
dab8b292 | 44 | |
1da177e4 | 45 | struct list_head retry_list; |
6cce3b23 N |
46 | /* queue pending writes and submit them on unplug */ |
47 | struct bio_list pending_bio_list; | |
34db0cd6 | 48 | int pending_count; |
1da177e4 LT |
49 | |
50 | spinlock_t resync_lock; | |
69335ef3 N |
51 | int nr_pending; |
52 | int nr_waiting; | |
53 | int nr_queued; | |
54 | int barrier; | |
1da177e4 | 55 | sector_t next_resync; |
6cce3b23 N |
56 | int fullsync; /* set to 1 if a full sync is needed, |
57 | * (fresh device added). | |
58 | * Cleared when a sync completes. | |
59 | */ | |
69335ef3 N |
60 | int have_replacement; /* There is at least one |
61 | * replacement device. | |
62 | */ | |
0a27ec96 | 63 | wait_queue_head_t wait_barrier; |
1da177e4 | 64 | |
69335ef3 N |
65 | mempool_t *r10bio_pool; |
66 | mempool_t *r10buf_pool; | |
4443ae10 | 67 | struct page *tmppage; |
dab8b292 TM |
68 | |
69 | /* When taking over an array from a different personality, we store | |
70 | * the new thread here until we fully activate the array. | |
71 | */ | |
2b8bf345 | 72 | struct md_thread *thread; |
1da177e4 LT |
73 | }; |
74 | ||
1da177e4 LT |
75 | /* |
76 | * this is our 'private' RAID10 bio. | |
77 | * | |
78 | * it contains information about what kind of IO operations were started | |
79 | * for this RAID10 operation, and about their status: | |
80 | */ | |
81 | ||
9f2c9d12 | 82 | struct r10bio { |
1da177e4 LT |
83 | atomic_t remaining; /* 'have we finished' count, |
84 | * used from IRQ handlers | |
85 | */ | |
86 | sector_t sector; /* virtual sector number */ | |
87 | int sectors; | |
88 | unsigned long state; | |
fd01b88c | 89 | struct mddev *mddev; |
1da177e4 LT |
90 | /* |
91 | * original bio going to /dev/mdx | |
92 | */ | |
93 | struct bio *master_bio; | |
94 | /* | |
95 | * if the IO is in READ direction, then this is where we read | |
96 | */ | |
97 | int read_slot; | |
98 | ||
99 | struct list_head retry_list; | |
100 | /* | |
101 | * if the IO is in WRITE direction, then multiple bios are used, | |
102 | * one for each copy. | |
103 | * When resyncing we also use one for each copy. | |
104 | * When reconstructing, we use 2 bios, one for read, one for write. | |
105 | * We choose the number when they are allocated. | |
69335ef3 | 106 | * We sometimes need an extra bio to write to the replacement. |
1da177e4 LT |
107 | */ |
108 | struct { | |
69335ef3 N |
109 | struct bio *bio; |
110 | union { | |
111 | struct bio *repl_bio; /* used for resync and | |
112 | * writes */ | |
113 | struct md_rdev *rdev; /* used for reads | |
114 | * (read_slot >= 0) */ | |
115 | }; | |
116 | sector_t addr; | |
117 | int devnum; | |
1da177e4 LT |
118 | } devs[0]; |
119 | }; | |
120 | ||
0eb3ff12 N |
121 | /* when we get a read error on a read-only array, we redirect to another |
122 | * device without failing the first device, or trying to over-write to | |
123 | * correct the read error. To keep track of bad blocks on a per-bio | |
124 | * level, we store IO_BLOCKED in the appropriate 'bios' pointer | |
125 | */ | |
126 | #define IO_BLOCKED ((struct bio*)1) | |
749c55e9 N |
127 | /* When we successfully write to a known bad-block, we need to remove the |
128 | * bad-block marking which must be done from process context. So we record | |
129 | * the success by setting devs[n].bio to IO_MADE_GOOD | |
130 | */ | |
131 | #define IO_MADE_GOOD ((struct bio *)2) | |
132 | ||
133 | #define BIO_SPECIAL(bio) ((unsigned long)bio <= 2) | |
0eb3ff12 | 134 | |
1da177e4 | 135 | /* bits for r10bio.state */ |
69335ef3 N |
136 | enum r10bio_state { |
137 | R10BIO_Uptodate, | |
138 | R10BIO_IsSync, | |
139 | R10BIO_IsRecover, | |
140 | R10BIO_Degraded, | |
856e08e2 N |
141 | /* Set ReadError on bios that experience a read error |
142 | * so that raid10d knows what to do with them. | |
143 | */ | |
69335ef3 | 144 | R10BIO_ReadError, |
749c55e9 N |
145 | /* If a write for this request means we can clear some |
146 | * known-bad-block records, we set this flag. | |
147 | */ | |
69335ef3 N |
148 | R10BIO_MadeGood, |
149 | R10BIO_WriteError, | |
150 | }; | |
1da177e4 | 151 | #endif |