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1da177e4 LT |
1 | #ifndef _RAID1_H |
2 | #define _RAID1_H | |
3 | ||
0eaf822c | 4 | struct raid1_info { |
3cb03002 | 5 | struct md_rdev *rdev; |
1da177e4 | 6 | sector_t head_position; |
be4d3280 SL |
7 | |
8 | /* When choose the best device for a read (read_balance()) | |
9 | * we try to keep sequential reads one the same device | |
10 | */ | |
11 | sector_t next_seq_sect; | |
12cee5a8 | 12 | sector_t seq_start; |
1da177e4 LT |
13 | }; |
14 | ||
15 | /* | |
16 | * memory pools need a pointer to the mddev, so they can force an unplug | |
17 | * when memory is tight, and a count of the number of drives that the | |
18 | * pool was allocated for, so they know how much to allocate and free. | |
19 | * mddev->raid_disks cannot be used, as it can change while a pool is active | |
20 | * These two datums are stored in a kmalloced struct. | |
8f19ccb2 N |
21 | * The 'raid_disks' here is twice the raid_disks in r1conf. |
22 | * This allows space for each 'real' device can have a replacement in the | |
23 | * second half of the array. | |
1da177e4 LT |
24 | */ |
25 | ||
26 | struct pool_info { | |
fd01b88c | 27 | struct mddev *mddev; |
1da177e4 LT |
28 | int raid_disks; |
29 | }; | |
30 | ||
e8096360 | 31 | struct r1conf { |
fd01b88c | 32 | struct mddev *mddev; |
0eaf822c | 33 | struct raid1_info *mirrors; /* twice 'raid_disks' to |
8f19ccb2 N |
34 | * allow for replacements. |
35 | */ | |
1da177e4 | 36 | int raid_disks; |
ce550c20 | 37 | |
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 | ||
9f2c9d12 N |
46 | /* list of 'struct r1bio' that need to be processed by raid1d, |
47 | * whether to retry a read, writeout a resync or recovery | |
48 | * block, or anything else. | |
ce550c20 | 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; | |
34db0cd6 | 54 | int pending_count; |
1da177e4 | 55 | |
ce550c20 N |
56 | /* for use when syncing mirrors: |
57 | * We don't allow both normal IO and resync/recovery IO at | |
58 | * the same time - resync/recovery can only happen when there | |
59 | * is no other IO. So when either is active, the other has to wait. | |
60 | * See more details description in raid1.c near raise_barrier(). | |
61 | */ | |
62 | wait_queue_head_t wait_barrier; | |
1da177e4 | 63 | spinlock_t resync_lock; |
191ea9b2 | 64 | int nr_pending; |
17999be4 | 65 | int nr_waiting; |
ddaf22ab | 66 | int nr_queued; |
191ea9b2 | 67 | int barrier; |
1da177e4 | 68 | |
ce550c20 N |
69 | /* Set to 1 if a full sync is needed, (fresh device added). |
70 | * Cleared when a sync completes. | |
71 | */ | |
72 | int fullsync; | |
1da177e4 | 73 | |
ce550c20 N |
74 | /* When the same as mddev->recovery_disabled we don't allow |
75 | * recovery to be attempted as we expect a read error. | |
76 | */ | |
77 | int recovery_disabled; | |
1da177e4 | 78 | |
ddaf22ab | 79 | |
ce550c20 N |
80 | /* poolinfo contains information about the content of the |
81 | * mempools - it changes when the array grows or shrinks | |
82 | */ | |
83 | struct pool_info *poolinfo; | |
9f2c9d12 N |
84 | mempool_t *r1bio_pool; |
85 | mempool_t *r1buf_pool; | |
709ae487 | 86 | |
ce550c20 N |
87 | /* temporary buffer to synchronous IO when attempting to repair |
88 | * a read error. | |
89 | */ | |
90 | struct page *tmppage; | |
91 | ||
92 | ||
709ae487 N |
93 | /* When taking over an array from a different personality, we store |
94 | * the new thread here until we fully activate the array. | |
95 | */ | |
2b8bf345 | 96 | struct md_thread *thread; |
1da177e4 LT |
97 | }; |
98 | ||
1da177e4 LT |
99 | /* |
100 | * this is our 'private' RAID1 bio. | |
101 | * | |
102 | * it contains information about what kind of IO operations were started | |
103 | * for this RAID1 operation, and about their status: | |
104 | */ | |
105 | ||
9f2c9d12 | 106 | struct r1bio { |
1da177e4 LT |
107 | atomic_t remaining; /* 'have we finished' count, |
108 | * used from IRQ handlers | |
109 | */ | |
4b6d287f N |
110 | atomic_t behind_remaining; /* number of write-behind ios remaining |
111 | * in this BehindIO request | |
112 | */ | |
1da177e4 LT |
113 | sector_t sector; |
114 | int sectors; | |
115 | unsigned long state; | |
fd01b88c | 116 | struct mddev *mddev; |
1da177e4 LT |
117 | /* |
118 | * original bio going to /dev/mdx | |
119 | */ | |
120 | struct bio *master_bio; | |
121 | /* | |
122 | * if the IO is in READ direction, then this is where we read | |
123 | */ | |
124 | int read_disk; | |
125 | ||
126 | struct list_head retry_list; | |
af6d7b76 | 127 | /* Next two are only valid when R1BIO_BehindIO is set */ |
2ca68f5e | 128 | struct bio_vec *behind_bvecs; |
af6d7b76 | 129 | int behind_page_count; |
1da177e4 LT |
130 | /* |
131 | * if the IO is in WRITE direction, then multiple bios are used. | |
132 | * We choose the number when they are allocated. | |
133 | */ | |
134 | struct bio *bios[0]; | |
191ea9b2 | 135 | /* DO NOT PUT ANY NEW FIELDS HERE - bios array is contiguously alloced*/ |
1da177e4 LT |
136 | }; |
137 | ||
138 | /* bits for r1bio.state */ | |
139 | #define R1BIO_Uptodate 0 | |
140 | #define R1BIO_IsSync 1 | |
191ea9b2 | 141 | #define R1BIO_Degraded 2 |
a9701a30 | 142 | #define R1BIO_BehindIO 3 |
d2eb35ac N |
143 | /* Set ReadError on bios that experience a readerror so that |
144 | * raid1d knows what to do with them. | |
145 | */ | |
146 | #define R1BIO_ReadError 4 | |
4b6d287f N |
147 | /* For write-behind requests, we call bi_end_io when |
148 | * the last non-write-behind device completes, providing | |
149 | * any write was successful. Otherwise we call when | |
150 | * any write-behind write succeeds, otherwise we call | |
151 | * with failure when last write completes (and all failed). | |
152 | * Record that bi_end_io was called with this flag... | |
153 | */ | |
9e71f9c8 | 154 | #define R1BIO_Returned 6 |
4367af55 N |
155 | /* If a write for this request means we can clear some |
156 | * known-bad-block records, we set this flag | |
157 | */ | |
cd5ff9a1 N |
158 | #define R1BIO_MadeGood 7 |
159 | #define R1BIO_WriteError 8 | |
4b6d287f | 160 | |
fd01b88c | 161 | extern int md_raid1_congested(struct mddev *mddev, int bits); |
1ed7242e | 162 | |
1da177e4 | 163 | #endif |