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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 { | |
3cb03002 | 7 | struct md_rdev *rdev; |
1da177e4 LT |
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 { | |
fd01b88c | 20 | struct mddev *mddev; |
1da177e4 LT |
21 | int raid_disks; |
22 | }; | |
23 | ||
24 | ||
25 | typedef struct r1bio_s r1bio_t; | |
26 | ||
27 | struct r1_private_data_s { | |
fd01b88c | 28 | struct mddev *mddev; |
1da177e4 LT |
29 | mirror_info_t *mirrors; |
30 | int raid_disks; | |
ce550c20 N |
31 | |
32 | /* When choose the best device for a read (read_balance()) | |
33 | * we try to keep sequential reads one the same device | |
34 | * using 'last_used' and 'next_seq_sect' | |
35 | */ | |
1da177e4 LT |
36 | int last_used; |
37 | sector_t next_seq_sect; | |
ce550c20 N |
38 | /* During resync, read_balancing is only allowed on the part |
39 | * of the array that has been resynced. 'next_resync' tells us | |
40 | * where that is. | |
41 | */ | |
42 | sector_t next_resync; | |
43 | ||
1da177e4 LT |
44 | spinlock_t device_lock; |
45 | ||
ce550c20 N |
46 | /* list of 'r1bio_t' that need to be processed by raid1d, whether |
47 | * to retry a read, writeout a resync or recovery block, or | |
48 | * anything else. | |
49 | */ | |
1da177e4 | 50 | struct list_head retry_list; |
191ea9b2 | 51 | |
ce550c20 N |
52 | /* queue pending writes to be submitted on unplug */ |
53 | struct bio_list pending_bio_list; | |
1da177e4 | 54 | |
ce550c20 N |
55 | /* for use when syncing mirrors: |
56 | * We don't allow both normal IO and resync/recovery IO at | |
57 | * the same time - resync/recovery can only happen when there | |
58 | * is no other IO. So when either is active, the other has to wait. | |
59 | * See more details description in raid1.c near raise_barrier(). | |
60 | */ | |
61 | wait_queue_head_t wait_barrier; | |
1da177e4 | 62 | spinlock_t resync_lock; |
191ea9b2 | 63 | int nr_pending; |
17999be4 | 64 | int nr_waiting; |
ddaf22ab | 65 | int nr_queued; |
191ea9b2 | 66 | int barrier; |
1da177e4 | 67 | |
ce550c20 N |
68 | /* Set to 1 if a full sync is needed, (fresh device added). |
69 | * Cleared when a sync completes. | |
70 | */ | |
71 | int fullsync; | |
1da177e4 | 72 | |
ce550c20 N |
73 | /* When the same as mddev->recovery_disabled we don't allow |
74 | * recovery to be attempted as we expect a read error. | |
75 | */ | |
76 | int recovery_disabled; | |
1da177e4 | 77 | |
ddaf22ab | 78 | |
ce550c20 N |
79 | /* poolinfo contains information about the content of the |
80 | * mempools - it changes when the array grows or shrinks | |
81 | */ | |
82 | struct pool_info *poolinfo; | |
1da177e4 LT |
83 | mempool_t *r1bio_pool; |
84 | mempool_t *r1buf_pool; | |
709ae487 | 85 | |
ce550c20 N |
86 | /* temporary buffer to synchronous IO when attempting to repair |
87 | * a read error. | |
88 | */ | |
89 | struct page *tmppage; | |
90 | ||
91 | ||
709ae487 N |
92 | /* When taking over an array from a different personality, we store |
93 | * the new thread here until we fully activate the array. | |
94 | */ | |
95 | struct mdk_thread_s *thread; | |
1da177e4 LT |
96 | }; |
97 | ||
98 | typedef struct r1_private_data_s conf_t; | |
99 | ||
1da177e4 LT |
100 | /* |
101 | * this is our 'private' RAID1 bio. | |
102 | * | |
103 | * it contains information about what kind of IO operations were started | |
104 | * for this RAID1 operation, and about their status: | |
105 | */ | |
106 | ||
107 | struct r1bio_s { | |
108 | atomic_t remaining; /* 'have we finished' count, | |
109 | * used from IRQ handlers | |
110 | */ | |
4b6d287f N |
111 | atomic_t behind_remaining; /* number of write-behind ios remaining |
112 | * in this BehindIO request | |
113 | */ | |
1da177e4 LT |
114 | sector_t sector; |
115 | int sectors; | |
116 | unsigned long state; | |
fd01b88c | 117 | struct mddev *mddev; |
1da177e4 LT |
118 | /* |
119 | * original bio going to /dev/mdx | |
120 | */ | |
121 | struct bio *master_bio; | |
122 | /* | |
123 | * if the IO is in READ direction, then this is where we read | |
124 | */ | |
125 | int read_disk; | |
126 | ||
127 | struct list_head retry_list; | |
af6d7b76 | 128 | /* Next two are only valid when R1BIO_BehindIO is set */ |
2ca68f5e | 129 | struct bio_vec *behind_bvecs; |
af6d7b76 | 130 | int behind_page_count; |
1da177e4 LT |
131 | /* |
132 | * if the IO is in WRITE direction, then multiple bios are used. | |
133 | * We choose the number when they are allocated. | |
134 | */ | |
135 | struct bio *bios[0]; | |
191ea9b2 | 136 | /* DO NOT PUT ANY NEW FIELDS HERE - bios array is contiguously alloced*/ |
1da177e4 LT |
137 | }; |
138 | ||
cf30a473 N |
139 | /* when we get a read error on a read-only array, we redirect to another |
140 | * device without failing the first device, or trying to over-write to | |
141 | * correct the read error. To keep track of bad blocks on a per-bio | |
142 | * level, we store IO_BLOCKED in the appropriate 'bios' pointer | |
143 | */ | |
4367af55 N |
144 | #define IO_BLOCKED ((struct bio *)1) |
145 | /* When we successfully write to a known bad-block, we need to remove the | |
146 | * bad-block marking which must be done from process context. So we record | |
147 | * the success by setting bios[n] to IO_MADE_GOOD | |
148 | */ | |
149 | #define IO_MADE_GOOD ((struct bio *)2) | |
150 | ||
151 | #define BIO_SPECIAL(bio) ((unsigned long)bio <= 2) | |
cf30a473 | 152 | |
1da177e4 LT |
153 | /* bits for r1bio.state */ |
154 | #define R1BIO_Uptodate 0 | |
155 | #define R1BIO_IsSync 1 | |
191ea9b2 | 156 | #define R1BIO_Degraded 2 |
a9701a30 | 157 | #define R1BIO_BehindIO 3 |
d2eb35ac N |
158 | /* Set ReadError on bios that experience a readerror so that |
159 | * raid1d knows what to do with them. | |
160 | */ | |
161 | #define R1BIO_ReadError 4 | |
4b6d287f N |
162 | /* For write-behind requests, we call bi_end_io when |
163 | * the last non-write-behind device completes, providing | |
164 | * any write was successful. Otherwise we call when | |
165 | * any write-behind write succeeds, otherwise we call | |
166 | * with failure when last write completes (and all failed). | |
167 | * Record that bi_end_io was called with this flag... | |
168 | */ | |
9e71f9c8 | 169 | #define R1BIO_Returned 6 |
4367af55 N |
170 | /* If a write for this request means we can clear some |
171 | * known-bad-block records, we set this flag | |
172 | */ | |
cd5ff9a1 N |
173 | #define R1BIO_MadeGood 7 |
174 | #define R1BIO_WriteError 8 | |
4b6d287f | 175 | |
fd01b88c | 176 | extern int md_raid1_congested(struct mddev *mddev, int bits); |
1ed7242e | 177 | |
1da177e4 | 178 | #endif |