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1da177e4 LT |
1 | #ifndef _RAID1_H |
2 | #define _RAID1_H | |
3 | ||
1da177e4 LT |
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; | |
1da177e4 LT |
31 | int last_used; |
32 | sector_t next_seq_sect; | |
33 | spinlock_t device_lock; | |
34 | ||
35 | struct list_head retry_list; | |
191ea9b2 N |
36 | /* queue pending writes and submit them on unplug */ |
37 | struct bio_list pending_bio_list; | |
191ea9b2 | 38 | |
1da177e4 LT |
39 | /* for use when syncing mirrors: */ |
40 | ||
41 | spinlock_t resync_lock; | |
191ea9b2 | 42 | int nr_pending; |
17999be4 | 43 | int nr_waiting; |
ddaf22ab | 44 | int nr_queued; |
191ea9b2 | 45 | int barrier; |
1da177e4 | 46 | sector_t next_resync; |
191ea9b2 N |
47 | int fullsync; /* set to 1 if a full sync is needed, |
48 | * (fresh device added). | |
49 | * Cleared when a sync completes. | |
50 | */ | |
5389042f N |
51 | int recovery_disabled; /* when the same as |
52 | * mddev->recovery_disabled | |
53 | * we don't allow recovery | |
54 | * to be attempted as we | |
55 | * expect a read error | |
56 | */ | |
1da177e4 | 57 | |
17999be4 | 58 | wait_queue_head_t wait_barrier; |
1da177e4 LT |
59 | |
60 | struct pool_info *poolinfo; | |
61 | ||
ddaf22ab N |
62 | struct page *tmppage; |
63 | ||
1da177e4 LT |
64 | mempool_t *r1bio_pool; |
65 | mempool_t *r1buf_pool; | |
709ae487 N |
66 | |
67 | /* When taking over an array from a different personality, we store | |
68 | * the new thread here until we fully activate the array. | |
69 | */ | |
70 | struct mdk_thread_s *thread; | |
1da177e4 LT |
71 | }; |
72 | ||
73 | typedef struct r1_private_data_s conf_t; | |
74 | ||
1da177e4 LT |
75 | /* |
76 | * this is our 'private' RAID1 bio. | |
77 | * | |
78 | * it contains information about what kind of IO operations were started | |
79 | * for this RAID1 operation, and about their status: | |
80 | */ | |
81 | ||
82 | struct r1bio_s { | |
83 | atomic_t remaining; /* 'have we finished' count, | |
84 | * used from IRQ handlers | |
85 | */ | |
4b6d287f N |
86 | atomic_t behind_remaining; /* number of write-behind ios remaining |
87 | * in this BehindIO request | |
88 | */ | |
1da177e4 LT |
89 | sector_t sector; |
90 | int sectors; | |
91 | unsigned long state; | |
92 | mddev_t *mddev; | |
93 | /* | |
94 | * original bio going to /dev/mdx | |
95 | */ | |
96 | struct bio *master_bio; | |
97 | /* | |
98 | * if the IO is in READ direction, then this is where we read | |
99 | */ | |
100 | int read_disk; | |
101 | ||
102 | struct list_head retry_list; | |
af6d7b76 N |
103 | /* Next two are only valid when R1BIO_BehindIO is set */ |
104 | struct page **behind_pages; | |
105 | int behind_page_count; | |
1da177e4 LT |
106 | /* |
107 | * if the IO is in WRITE direction, then multiple bios are used. | |
108 | * We choose the number when they are allocated. | |
109 | */ | |
110 | struct bio *bios[0]; | |
191ea9b2 | 111 | /* DO NOT PUT ANY NEW FIELDS HERE - bios array is contiguously alloced*/ |
1da177e4 LT |
112 | }; |
113 | ||
cf30a473 N |
114 | /* when we get a read error on a read-only array, we redirect to another |
115 | * device without failing the first device, or trying to over-write to | |
116 | * correct the read error. To keep track of bad blocks on a per-bio | |
117 | * level, we store IO_BLOCKED in the appropriate 'bios' pointer | |
118 | */ | |
119 | #define IO_BLOCKED ((struct bio*)1) | |
120 | ||
1da177e4 LT |
121 | /* bits for r1bio.state */ |
122 | #define R1BIO_Uptodate 0 | |
123 | #define R1BIO_IsSync 1 | |
191ea9b2 | 124 | #define R1BIO_Degraded 2 |
a9701a30 | 125 | #define R1BIO_BehindIO 3 |
d2eb35ac N |
126 | /* Set ReadError on bios that experience a readerror so that |
127 | * raid1d knows what to do with them. | |
128 | */ | |
129 | #define R1BIO_ReadError 4 | |
4b6d287f N |
130 | /* For write-behind requests, we call bi_end_io when |
131 | * the last non-write-behind device completes, providing | |
132 | * any write was successful. Otherwise we call when | |
133 | * any write-behind write succeeds, otherwise we call | |
134 | * with failure when last write completes (and all failed). | |
135 | * Record that bi_end_io was called with this flag... | |
136 | */ | |
9e71f9c8 | 137 | #define R1BIO_Returned 6 |
4b6d287f | 138 | |
1ed7242e JB |
139 | extern int md_raid1_congested(mddev_t *mddev, int bits); |
140 | ||
1da177e4 | 141 | #endif |